sorted by date time
Всем привет !
Интересно, что дает транзисторный повторитель на выходе ?
http://www.smail.lt/~ncss/regen_info/pdf/2x_antenna_Q_multip_d.PDF
А что дает транзисторный повторитель между лампами ?
http://www.smail.lt/~ncss/regen_info/pdf/2x_antenna_Q_multip_e.PDF
Создалось впечатление, когда увеличиваю ток через транзистор обратной связи
(поставил на emitere 22om и в базе 10k заменил на 1k) увеличивается мощности
слабых сигналов на выходе вместе с понижением уровня искажений от мощных
диапазонных AM станций 41m при том же близком к критическому уровню регенерации.
Это навело на мысль. Возможно ли заменит катодные резисторы на индуктивности.
Может детектирование мощных сигналов исчезнет совсем ? Нашел книгу Б.M.Богданович
'Нелинейные Искажения в приемнo - усилительных устройствах', 1980 . Там несколько
страниц посвящено повторителям. Сделал скан этих страниц. Повторител имеет
уникальные свойства, а если их охватит еще усилителем то линейность можно повышать.
Но в нашем случаю усилитель то регенеративный повторитель.
http://www.smail.lt/~ncss/regen_info/pdf/NIVPUU_BogdanovichBM.PDF
Интересно посмотреть как в таких схемах работают ультра высокочастотные
2x6C17KB и мощный повторитель на транзисторе 2T904A
http://www.gstube.com/data/?mmm=636
http://www.smail.lt/~ncss/regen_info/pdf/Q_Multip_Combo.PDF
http://www.smail.lt/~ncss/regen_info/pdf/Q_Multip_Combo2.PDF
Но источник питания должен иметь весьма большое напряжение.
Задумал пробовать на ультра высокочастотной ГC-4B.
http://www.gstube.com/data/?mmm=1444
http://www.smail.lt/~ncss/regen_info/pdf/Q_Multip_Combo_GS4B.PDF
А можно ли анод соединит с выходом транзисторного повторителя прямо без
конденсатора ? Большое значение имеет трансформатор в катоде лампы и
минимальная нагрузка катодной цепи.
http://www.smail.lt/~ncss/regen_info/pdf/Q_Multip_Combo_GS4B_L.PDF
Оказывается - эта лампа генерирует при очень минимальных напряжениях на аноде .
Фото монтажа схемы. Используется основание из дерева (материал - старый дуб не менее 200 лет )
http://www.smail.lt/~ncss/regen_info/Q_MULTIP_COMBO_GS4B_L.JPG
С трансформатором на выходе
http://www.smail.lt/~ncss/regen_info/pdf/Q_Multip_Combo_GS4B_TR.PDF
В последствии родилась вот такая простая схема входного Q-умножителя
с повышенным динамическим диапазоном на одной металокерамической
лампе ГС-4В и на одном транзисторе 2T904A. Напряжение на аноде до + 6V,
снимается с транзисторного повторителя, как динамической нагрузки.
Там два версии. Они различаются анодной нагрузкой и способом снятия
выходного сигнала . А - очень помехoустойчив. B - с дополнительным
усилением по напряжению. А - можно рекомендовать при длиной антенне.
B - при короткой антенне. B - очень мягко захватывает и AM сигналы и сигнал
оконечного регенеративного приемника если он используется в режиме генерации.
Перестройкой +- 5Khz приемника можно синхронно изменят настройку
Q_умножителя. Очень увлекательная затея для AM DX когда рядом нету мощных
станций. А - тоже можно управлять синхронно, но интервал захвата очень узкий
но DX и рядом мощные AM разделяются прекрасно и при длиной антенне.
http://www.smail.lt/~ncss/regen_info/pdf/Q_Multip_Combo_GS4B_AB.PDF
Побольше идеи можно найти дальше на форуме начиная от
http://forum.cqham.ru/viewtopic.php?t=10499&postdays=&postorder=asc&&start=810
С уважением
Saulius
2007 09 26 11:00
Добрый день.
Упорядочил в одно место информацию по времени разработки.
Сначала синхронный генератор на 6П18П как приемник и дальше от
маломощного Q-умножителя как высокодобротного фильтр на Г807
к мощному антенному умножителю добротности на 6C51H-B.
Именно так на Г807 маломощный (в катодах 3.3 ... 15 Ком при аноде + 15...190V),
на 6C51H-B мощный (в катодах 82 ... 200 ом, при аноде +27V).
В последней схеме обе антенны внутренняя 1m диаметром и дельта
внешняя длиной 80m принимает участие в регенерации. Теории этих
схем нет. Некоторые режимы показаны в схемах, остальные на практике.
http://www.smail.lt/~ncss/regen_info/QMultip/MySO_Regen_Autodyne_p1.jpg
http://www.smail.lt/~ncss/regen_info/QMultip/MySO_Regen_Autodyne_p2.jpg
http://www.smail.lt/~ncss/regen_info/pdf/SO_Q_Multiplier_G807.PDF
http://www.smail.lt/~ncss/regen_info/pdf/SO_Q_Multiplier_2xG807_2xGU50.PDF
http://www.smail.lt/~ncss/regen_info/pdf/MySO2_Regen_Autodyne_p1.pdf
http://www.smail.lt/~ncss/regen_info/pdf/My_SO_2x_antenna_Q_multiplier_autodyne.PDF
http://www.smail.lt/~ncss/regen_info/pdf/2x_antena.PDF
http://www.smail.lt/~ncss/regen_info/pdf/My_SO_loop_antenna_Q_multiplier.PDF
http://www.smail.lt/~ncss/regen_info/pdf/2x_antena_BPT.PDF
http://www.smail.lt/~ncss/regen_info/pdf/2x_antena_2x_6C51H-B.PDF
http://www.smail.lt/~ncss/regen_info/pdf/2x_antenna_Q_multip_Long.PDF
http://www.smail.lt/~ncss/regen_info/pdf/2x_antenna_Q_multip_80mLong.PDF
А также некоторые фото по времени .
http://www.smail.lt/~ncss/regen_info/QMultip/SO_PS_REGEN_AUTODYNE_Q_MULTIP.jpg
http://www.smail.lt/~ncss/regen_info/QMultip/Q_MULTIP_2xG807.jpg
http://www.smail.lt/~ncss/regen_info/QMultip/Q_MULTIP_2xG807_2xGU50_Back.jpg
http://www.smail.lt/~ncss/regen_info/QMultip/Q_MULTIP_2xG807_2xGU50_Front.jpg
http://www.smail.lt/~ncss/regen_info/QMultip/Q_MULTIP_2xG807_2xGU50_Dark_Night.jpg.jpg
http://www.smail.lt/~ncss/regen_info/QMultip/2x_antena.jpg
http://www.smail.lt/~ncss/regen_info/QMultip/2x_antenna_nuvistor.jpg
Побольше описаний можно найти дальше на форуме начиная ot
http://forum.cqham.ru/viewtopic.php?t=10499&postdays=0&postorder=asc&&start=60
С уважением
Saulius
А тут аналогичная схема приемника на мощных тетродах от Olivier Ernst F5LVG:
http://oernst.f5lvg.free.fr/tubes/1v1-el84/1v1_EL84_anglais.html
and
and
| From: ... Date: Tue Dec 7, 2004 10:11 am Subject: Re: [regenrx] Re: Regen newbee |
A regen detector works out quite nicely for BCB reception, just make sure your coupling
is loose enough not to lock to the big guns. At MW, this isn't all that big of a problem, or
at least, has not been for me. The very cool thing about AM Broadcast DXing on MW is
that at those frequencies, Regens enter an operating environment which approaches ideal.
You can do a bang-up job with just a single tube regen ( i call them a "single" ). When i got
bored up in Jacksonville, Fla. i whiled away the time with a 0-v-0 single using a battery 330
Cunningham Balloon triode. Something about those roundish silvery tubes that just made it
work just a tad better than the newer '30s with the ST envelopes. Perhaps i'm just "biased"
( bad, i know . . . ;>) My coil was about 2 inches in diametre, and wound with #30 magnet
wire. Capacitor was the standard 365pF broadcast cap. Antenna was an overhead wire,
inductively coupled to the grid input LC. Armstrong tickler circuit. I liked it because i didn't
have to mess with a vernier dial, it had a great tuning rate right off. Calibrated it by tuning in
WGTO, Cypress Gardens. ( 540 AM, Now WFLA). I found it best to begin in autodyne
mode, find a heterodyne and then back out of autodyne, tuning until either i reached satisfactory
rectification OR until just before the detector locked, as in the case of a particular station on
970AM, when we had WLOF booming on 950, and WHOO booming on 990.
NONE of my superhets would discriminate between those two local 20 kw stations -
who for some years stayed at that power after dark - but my little single did.
In fact, since U.S. stations are 10kc apart, even between these, i could pull out an occasional
station on the 5kc space, usually either a ute, a pirate, or a foreign broadcast. I discovered that
if you had White's Catalogue, and if you could find out the maintenance scheds of some of the
big eastern stations, you could time it to copy west coasters when the easterns went down for a
few night-time hours. Had a lot of fun regenin' on MW BC.
gary // wd4nka visit my site at: <A HREF="http://www.qsl.net/wd4nka/">http://www.qsl.net/wd4nka/</A>
"Don't worry about the world coming to an end today. It's already tomorrow in Australia."
From: "Tracy" <...> |
http://groups.yahoo.com/group/regenrx/messages
Gary and gang, here is a reply on the subject from N1TEV. I'll figure out why his reply didn't post.
Tracy N4LGH
Hi Tracy...FYI. I tried to post this on the regen site but I don't see it there.
This was in response to the "autodyne" question. Perhaps you could post this for me.
Thanks. ---------------------------------------------------------------------
Hello. Yes, this stuff IS actually quite complicated.
An OSCILLATING regenerative detector is an oscillator and a detector in one stage.
The only signals that can travel through the regenerative loop are those whose frequencies
are with-in the passband of the LC circuit. Therefore, when the detector's own oscillations
are close in frequency to those of the incoming RF signal BOTH pass through the regenerative loop.
When close to but just below oscillation, RF input signals get amplified greatly but not heterodyned.
Above oscillation, BOTH the input signal and the detectors oscillation travel through the regenerative
loop, and since the transistor (or tube) is non linear, they MIX together (heterodyne) which creates sum
and difference frequencies and in actual fact a bunch of other mixing products. However, low pass
filtering removes all but the desired DIFFERENCE frequency which provides a beat note for CW and SSB.
Note however, that this difference frequency can not travel through the regenerative loop itself because
it is way to low in frequency (only RF frequencies close to the tuned frequency can pass through).
Now...IF the regen set is using a "throttle capacitor" which is very stable, you can set regeneration so
that you sit right at the oscillation point but the lowest drift always occurs when the regen level is "pushed"
higher into a solid oscillation. It's very easy to see why frequency drift and regeneration both drift a lot
below oscillation but it is much less clear why (in a throttle cap circuit) heavy oscillation gives very stable
results...very similar to a good Direct Conversion receiver.
My own "guess" is that, when operating in this state, the active device, JFET,tube, etc is spending almost
all of its energy on sustaining its own RF oscillation and only a small amount in building up the input RF signal.
So, changes in RF signal strength will have a very small effect on overall RF levels in the detector whereas
BELOW oscillation all of the detectors energy is used building-up the RF input signal and small RF input
level changes produce large output changes. Then...there is the issue of "grid leak biasing" by the RC detection
network. In a vacuum tube, this is normally a parallel RC network (about 1Meg Ohm and 100pF) between
the LC tank and the grid of the detector tube.
In a JFET circuit, it is the RC network (about 2k and 100pF) between the JFET's source and ground.
I think both function in a similar way: with the detector oscillating the RF frequencies go through the network
but the audio variations (AM modulation) is blocked and so builds-up a varying DC voltage which changes
the bias of the detector. Stronger RF input signals produce larger detector currents producing more DC bias
which lowers gain so this acts (a bit) like an AGC system and tends to stabilize operation.
Sorry for the overly long ranting here! Regards, N1TEV (Charles Kitchin) ---
In regenrx, ... wrote:
> I have a question for the more engineering
> savy amongst us, regarding the operation
> of the regenerative detector in autodyne mode.
> > C. Kitchin posted me once, some time back
> in a 3-way with Tracy, that much of what is
> written about the regen is, frankly, all wet.
> I am inclined to agree. Especially when it
> comes to superregen operation and now,
> also when it comes to autodyne operation.
> > Autodyne, the operation of a standard regen
> in an oscillating condition is demonstrably
> more stable than when running in non
> oscillatory mode, especially at it's most
> sensitive point: just before oscillation. Once
> it oscillates, the behaviour changes entirely.
> > Terman, in his 1937 "Radio Engineering" has
> some interesting things to say about the two
> different operating modes: " The difference
> between the two cases . . . . is that with
> the regenerative detector this adjustment
> ( the critical point just below oscillation ) is
> very critical and impossible to maintain ( for
> each and every signal, in otherwords, minute
> differences in signal voltage requires adjustment )
> --- whereas in the oscillating detector the oscillations
> automatically assume an amplitude that picks
> out this critical condition and maintains it with
> **complete stability** " ( parenthesis mine )
> > In the next paragraph on pages 455 and 456, he
> goes on to explain. Rather than quote the whole
> page, let me boil it down to it's essence as best
> as i can read it:
> > The received signal is introduced to the grid,
> accompanied by the "feedback" signal. The
> two combine creating a resultant voltage equal
> to the difference frequency, "as in the case of
> any heterodyne signal". Here is where i struggle
> for understanding: Terman then says that the
> "variation of amplitude of the resultant wave
> applied to the grid of the tube acts as though
> there were **no signal voltage aplied to the
> detector**, but rather as though the regeneration
> of the oscillating detector were alternately decreased
> and increased from its actual value **at a rate
> corresponding to the beat frequency**. The oscillating
> detector hence has its greatest sensitivity when a small
> change in the regeneration will produce a large change
> in the amplitude of the generated oscillations.
> This condition is always realized when the regeneration
> has the smallest value at which oasillations will exist
> and when the resonant circuit has the highest possible
> Q (i.e. the lowest possible actual resistance)"
> > What this seems to say is that the detector is not
> really responding to the received signal directly, but
> rather to the amplitude of the difference of the received
> signal and the feedback oscillation frequency, which
> is an audio frequency beat difference. And further,
> the feedback voltage assumes the amplitude of the
> beat frequency, feeding it back to the grid. To me, it
> sounds as if the beat frequency amplitude is being
> fed back to the input signal, re-enforcing it with that
> amplitude, and so on. Almost as if the detector is
> picking out the beat signal and amplifying **it**.
> > Is this what is meant by the oscillating detector
> "automatically picking out this condition, and
> maintaining it with complete stability" ?
> >I find no other reference in my library that analyses
> the autodyne in this detail. It would appear that
> indeed, there is more going on than what is seen
> on the surface.
> > gary // wd4nka
> > visit my site at: >
<A HREF="http://www.qsl.net/wd4nka/">http://www.qsl.net/wd4nka/</A>
> > "Don't worry about the world coming to an end today.
> It's already tomorrow in Australia."
| From: ... Date: Thu Dec 9, 2004 6:36 am Subject: A Phase Locked Regen? (longish- again.) |
Hi, Gang: Did a little experimenting with my regenerodyne between putting up lights and the tree,
and i re-disovered something that reminds me of a few regenerative projects from the 1930s.
(boy, if you want some neat old regen ideas, those 1930s rags are loaded!) I use a solid state
"spotter" for my regeneratives, usually just a 2n2222a colpitts and a 9v transistor radio battery.
All i do is take a few choice frequency xtals and plug them in and tune to the heterodyne.
Since my rigs all use the 1 - 100 or 1 - 500 hash marks, such as the HRO dial, i usually spot for
exact frequency. And since i am also transmitting, often, when i am using my regens, all i really
need is to know my transmit freq. Anyway, as i was spotting, i thought i would see if the spotter
would act as an effective bfo, with the detector in non-oscillatory mode. Jeepers!
When the regen was set pretty close to threshold, and the "spotter" placed pretty far away
-- call it controlled injection -- i was getting awfully danged near the sensitivity of autodyne!
And because the regen was forcing the Q as usual, i was getting hugely narrower passband
than a non-regenerating direct conversion receiver. I "rubbered" the xtal with a cap to get
about 1kc movement and found i could tune the receiver with the detector staying put.
A form of DC reception. Only the intense gain of the regen was more than enough to make
added audio amplification unecessary. I probably could vary about 5 kc from side to side,
total 10kc before i would have to re-tune the actual detector itself, depending on regen setting.
The thought came to mind: a separate LO would not couple directly to an antenna.
Neither is it normally affected by antenna variables, similar to a DC receiver. Why not combine the two?
Gee, that's original . . . to 1934! But the DC/Regen idea never took hold because of the added circuitry,
i guess. ( i think some marine systems did use this mode in a limited fashion.) I figured that since a DC LO
operates on very nearly the same frequency as the received signal plus or minus an audio difference,
why not have a regen detector tracking a local oscillator? Use a dual-ganged tuning cap to simultaneously
tune the LO and detector together. This might have some interesting possibilities. The detector is not oscillating,
and buffers the only oscillating circuit, the DC-LO. You still would still need the regen control to vary the
sensitivity of the detector. Thus with two tubes, say, a 6SN7 and a 6C5 or 6J5 in a simple vfo arrangement,
you could make what might be a quite stable rx, yet it is still a true regenerative receiver, centered upon the
sensitivity of detector for successful operation. And, of course, the option would be available to shut the LO off,
and just operate straight thru in regular autodyne mode. The op would have a choice in case he/she would need to
really dig a signal out of the mud. Raw autodyne is still the most sensitive way to go, bottom line!
But at the critical setting, even in autodyne, there is the overload and locking issue. A separate LO might well
prevent some of this, in that the detector would already be "locked" to the LO.
( hmmm, call it a "phased locked regen" ?) Another idea would be to use a xtal in the LO, and switch it
out to the transmitter for transceive operation. This would be a single-frequency operating mode, but again,
all you really need these days for transmitting is to hear on the transmit frequency.
Just a thot to toss in the big bag of regenerative ideas!
Good Providence in all your regen endeavours!
gary // wd4nka visit my site at: <A HREF="http://www.qsl.net/wd4nka/">http://www.qsl.net/wd4nka/</A>
"Don't worry about the world coming to an end today. It's already tomorrow in Australia."
| From: "v2x2002" <> Date: Wed Dec 22, 2004 4:46 am Subject: SO outperforms the PLL |
About 3 years ago I find gary's // wd4nka REGENERODYNE and ...
group in "internet info sea" About 2 years ago I find very intresting papers in EDN
http://www.edn.com/contents/images/46326.pdf
and
http://www.edn.com/contents/images/72299di.pdf
and finally "fall in love" with tube regens
Best regards Saulius
| From: "v2x2002" <> Date: Thu Dec 23, 2004 2:47 am Subject: SO from Source-coupled VCO |
About 2 years ago I find another interesting paper in RFDESIGN
http://rfdesign.com/images/archive/0401Koster58.pdf
Who know's any ideas or links, how make simple source (catode)- coupled
SO (sinchronous oscilator) with soft regeneration adjustment and fine
AUTODYNE detection on LW, MW and SW ?
Best regards Saulius
From: "macrohenry" <...>
Date: Sun Jan 2, 2005 6:39 pm
Subject: Synchronous Oscillator macrohenry
http://www.edn.com/article/CA46326.html
This is supposed to pick a signal way out of the noise.
Interesting, but frustrating article. Not enough detail for me.
Anyone care to comment on whether this would be a useful project for
an AM MW receiver?
Mac
From: Barry Savage <...>
Date: Mon Jan 3, 2005 6:24 am
Subject: Re: [Homebrew Transistor Radios] Synchronous Oscillator paliodude2004
You are right. Not enough detail to know exactly how it works. But the
description makes me think it is a grandchild of the old homodyne and
synchrodyne circuits of the early 1940's. Look them up and see if this helps.
Also, you will notice in the articles about these that they are predecessors of
the modern direct conversion circuits. Sorry, no links at the moment, but I
will look them up.
Barry
>This is supposed to pick a signal way out of the noise.
Interesting, but frustrating article. Not enough detail for me.
Anyone care to comment on whether this would be a useful project for
an AM MW receiver?
Mac
From: "Barry Savage" <...>
Date: Mon Jan 3, 2005 7:40 am
Subject: History of the homodyne and synchrodyne paliodude2004
Hello All:
The recent discussion of synchronous circuits led me to look up the
history of the homodyne and synchrodyne receiver circuits. Very
interesting...
http://www.thevalvepage.com/radtech/synchro/synchro.htm
Hope this helps.
Barry
From: "macrohenry" <...>
Date: Mon Jan 3, 2005 10:44 am
Subject: Re: Synchronous Oscillator macrohenry
--- In homebrewtransistorradios, "macrohenry"
<...> wrote:
>
> http://www.edn.com/article/CA46326.html
Mac
From: "Steven S. Coles" <...>
Date: Mon Jan 3, 2005 1:06 pm
Subject: Re: Synchronous Oscillator kd7yte
Macrohenry and Barry,
Thank you for introducing this fascinating topic.
I'm wondering whether anybody has the QEX article on synchronous
oscillators.
A related topic "synchronous AM demodulation" brings up about 200
Google hits.
Lock-in amplifiers (another related topic) appear to have similar
characteristics to synchronous oscillators. I worked on systems
containing lock-ins when doing chemistry instrumentation. But my
recollection is lock-ins need an external sync input.
I hope to hear more about synchronous oscillators.
Best regards,
Steven
From: "Steven S. Coles" <...>
Date: Mon Jan 3, 2005 8:18 pm
Subject: Re: Synchronous Oscillator kd7yte
Macrohenry,
I haven't figured it out. But this much is interesting (at least to
me): The synchronous oscillator looks like a cascode amplifier to
the signal. (The signal enters Q2's emitter and exits its
collector. So Q2 appears to be in common-base configuration to the
signal.)
But from the Colpitts oscillator's point of view how is Q2
configured? Maybe that's a nonsense question. Does Q2 see Q1 as a
current source controlled by the input signal?
Any ideas?
Best regards,
Steven
From: "Michael Hebert" <...>
Date: Mon Jan 3, 2005 9:42 pm
Subject: Re: Synchronous Oscillator qrpbear
Steven,
A cascode amplifier would require Q2's base to be at RF ground
potential. Ain't no cascode.
Q1 is just a signal controlled current source.
The circuit is a regenerative detector with "signal controlled
regeneration". Notice the point about performance being better with
weak input signals... same as the classic regennie, IOW, this buggah
will block on strong signals! Nevertheless, it offers some valuable
assets not the least of which is antenna isolation. Having the signal
waveform control the oscillator frequency should circumvent the
problem of offset LO frequency that is the bane of DC receivers. An
input attenuator would be a worthwhile addition to the circuit and
some form of rf blocking will be necessary on the output to keep the
oscillator signal out of the audio chain.
73,
'Bear' NH7SR
From: "Steven S. Coles" <...>
Date: Mon Jan 3, 2005 10:17 pm
Subject: Re: Synchronous Oscillator kd7yte
Bear,
Thank you for the information.
Have to admit I'm tempted to breadboard one of these with pots for
bias. Probably don't need a regen control as such. Just back off
Q1 collector current (via starving the base) until Q2's gain drops
to the edge.
Best regards,
Steven
From: Ramon Vargas <...>
Date: Tue Jan 4, 2005 9:12 am
Subject: Re: [Homebrew Transistor Radios] Re: Synchronous Oscillator rvargaspatron
Hello Steven et al,
The Colpitts oscillator in the article is a common-base type not
actually grounded, but with sufficient loop-gain as to not requiring a
strictly-speaking grounded base (so seems to me). The circuit seems to
be working around 140MHz, and at this VHF-frequency, Colpitts-type
oscillators can easily oscillate without a grounded base, provided the
base bias-resistor is not too large.
Just and idea......
Best regards,
Ramon
............
From: "macrohenry" <...>
Date: Sun Apr 24, 2005 10:10 pm
Subject: Synchronous Oscillator works macrohenry
After a couple of weeks of sporadic experimentation, and after several
discussions with Mike Tuggle, I finally got a synchronous oscillator
(SO) to work. It's a two transistor ckt, consisting of a Colpitts
oscillator shunted with another transistor that receives an AM signal
and synchronizes the oscillator to the frequency of the incoming signal.
The SO is reputedly able to recover a signal 90 dB into noise, while
the PLL is limited to 30 dB. Whether that's true, I don't know, but I
can tell you that the SO does actually work.
How do I know it works? I set the SO's free running frequency to
530kHz. Using a DX398 as a spotter, I set it to 530kHz and then I
maximized its meter with the SO. Then I tuned my Benodyne crystal
radio to 530 and heard my weak test station(a local 10 watt road info
station). I then adjusted the SO to zero beat. The reception seemed
to be more free from the fluttering effects I often hear with this
station.
Next I set the DX398 to 560. I tuned the Benodyne up to 560, hearing
weak stations in between, and watched the DX398 meter peak as I tuned
the Benodyne to 560. The SO was tracking the Benodyne's input; it's
stronger signal was washing out the actual source signal at 560. I
was able to do the same for 590, so I know the SO has at least a 60
kHz bandwidth. Even at 590, a local blowtorch, the SO signal was
stronger and pegged the meter when I tuned the Benodyne up to 590.
I just finished this, so I don't have more results. It's breadboarded
with all kinds of clipleads spread about. Now that I know it works,
I'll hardwire it properly and do some proper testing.
One peculiar property is that the SO output is a phase modulated
carrier, not amplitude modulated. It's a couple of volts so the diode
doesn't have to deal with low voltage. I'm able to demodulate it with
a 1N34. I reckon this is slope detection, right? I expect there is a
better way. Any ideas for a simple phase demodulator?
Macrohenry
From: Ramon Vargas <...>
Date: Mon Apr 25, 2005 2:18 pm
Subject: Re: [Homebrew Transistor Radios] Synchronous Oscillator works rvargaspatron
Hello all,
I donґt know if what Iґll comment on the following lines is very much
related but I have succeeded (almost by accident) demodulating the audio
FM program from a local TV broadcaster using an SW regenerative receiver
in the oscillating state (please continue reading before making
yourselves questions about my insanity).
Procedure: Tune near where the station is. Increase regeneration in your
receiver until you hear the typical whoosh-like sound. Tune carefully
your receiver slightly above the station's audio carrier's frequency.
You will eventually hear how the oscillation is pulled down in frequency
towards the station's. In other words, it will be synchronized. Because
the station's signal is FM modulated, your receiver's oscillation signal
will also be frequency modulated (will be "pulled" to do so), and due to
the tank circuit's frequency response (you are tuned on the left skirt)
an FM to AM slope conversion will take effect. At this point, the
nonlinearities of the active device of your regen will take care of the
AM demodulation process as usual. The result is high quality audio
demodulated from an FM signal.
Many will ask themselves what is a TV carrier doing in the SW spectrum?
OK, due to irrational decisions, there is a lot of FM and TV stations on
top of a hill some 6km south of my home. Many intermod products being
generated, some occupy unusual spots in the SW spectrum.
The good part of the story is that you can carefully build a VHF
regenerative receiver and try hearing to the audio channels of your
favorite TV stations using this procedure. Please be aware that I am
referring to the use of regens, not superregens.
Regarding the use of superregens for WBFM (wide band FM) and NBFM
(narrow band FM) reception, Charles Kitchin N1TEV has conducted very
nice research on this.
Best regards,
Ramon Vargas Patron
...........................................
From: "Steven S. Coles" <...>
Date: Mon Apr 25, 2005 6:50 pm
Subject: Re: Synchronous Oscillator works kd7yte
Macrohenry,
That sounds impressive. Is the circuit posted somewhere?
Best regards,
Steven
From: bhtongue
Date: Tue Apr 26, 2005 11:29 am
Subject: Re: Synchronous Oscillator works bhtongue
Hi Mac,
Congratulations on your success with the SO.
Is the antenna-ground-system connected only to the SO and is the
Benodune magnetically coupled to the SO tank?
When you tune the SO setup to your weak test station at 530 kHz, does
it play louder in the Benodyne than when the Benodyne is used as a
normal crystal set and tuned to the 530 kHz station without the
presence of the SO?
I would expect the phase modulation of the SO to disappear when the
free-running frequency of the SO is the same as that of the station
being received and to which the Benodyne is tuned. I think that phase
modulation of the SO should appear and increase as the Benodyne is
tuned to stations of frequecy further away from the free-running
frequency of the SO.
Best regards,
Ben
From: "macrohenry" <...>
Date: Tue Apr 26, 2005 10:19 pm
Subject: Re: Synchronous Oscillator works---Whoops, all bets are off macrohenry
--- In homebrewtransistorradios, bhtongue
<...> wrote:
>
Uh, I think I might have unintentionally done a Fleishman & Pons here.
Mike T. questioned whether the Benodyne itself might be responsible
for the meter rise, and he suggested looking at the meter with the SO
power disconnected. He was right: the meter rises just as much by
tuning the Benodyne to the station's frequency, apparently a function
well known to DXers. So I was measuring the wrong thing.
Attaching my frequency counter to the SO output alters its frequency
to the point of unreliability; things don't look so good now, as it
does not track with the freq counter attached. Now I have to buffer
the SO output so I can attach a frequency counter to it to see if I
can get it to track.
Steve, here's a link to what got me started: This is a SO ckt similar
to what I'm working on, but mine is rewired a bit:
Click on the text that says figure 1. I used ordinary bias values,
caps and coils for MW frequencies.
http://www.edn.com/article/CA46326.html
To answer Ben's questions:
> Is the antenna-ground-system connected only to the SO and is the
> Benodune magnetically coupled to the SO tank?
I'm using the SO to detect weak signals from the Benodyne. Before the
signal reaches the Benodyne's diode, I tap the signal and bring it
into the SO, which shares the Benodyne's ground. I take the output of
the SO into a 1N34, with feeds an audio amp.
> When you tune the SO setup to your weak test station at 530 kHz,
does it play louder in the Benodyne than when the Benodyne is used as
a normal crystal set and tuned to the 530 kHz station without the
> presence of the SO?
I think this question assumes a different setup than what I have,
since I don't play it in the Benodyne. However, the output is louder
than the Benodyne going straight into the amp, and the signal is much
more selective.
Incidentally, at one point I took the SO out of the ckt, connecting
the Benodyne straight to the amp. Then I turned on the SO and tuned
it to zero beat for exalted carrier reception, a la Mike Tuggle. I
was amazed that it was just as loud and selective as when I had the
oscillator in ckt. The signal was 4-5 time louder than with the
oscillator turned off. This effect does not need a SO ckt, any
oscillator tuned to zero beat will do the trick.
>
> I would expect the phase modulation of the SO to disappear when the
> free-running frequency of the SO is the same as that of the station
> being received and to which the Benodyne is tuned. I think that
phase modulation of the SO should appear and increase as the Benodyne
> is tuned to stations of frequecy further away from the free-running
> frequency of the SO.
Regardless of my foible, I think this simple ckt holds promise for
simple ckt dxing. Right now I just want to get the thing to work.
Thanks for all your comments.
Mac
> Ben
From: "Jara" <...>
Date: Sun Jun 19, 2005 8:28 pm
Subject: Synchronous demodulators krysatec
See also: http://marousek.sh.cvut.cz/synch/basics.pdf
(english).
Best regards Jara "Rat"
From: "Jara" <...>
Date: Sun Jun 19, 2005 9:30 pm
Subject: Synchronous and quasi synchronous demodulators krysatec
1. True synchronous demodulator
You need two signals for detector: carrier wave with modulation
and signal from internal oscillator, which is synchronised with
carrier wave (without modulation).
"Lock" function i here.
2. Quasi synchrodemodulator
You need also two signals for detector: carrier wave with modulation
but here is not internal oscillator. You use direct carrier wave
without modulation.
Here is not "lock" function. You need BFO for SSB/DSB signals.
First version is better ( best resistance against disturbance and
fadding) , but is not simply for setting.
Second version is simply and you can use much ICs for TV sets (video
IF amlifier with demodulator - TV video signal is also amplitude
modulated ). For SSB and DSB you need BFO signal for mixer inside IC.
3. Reciprocating detector
Here is also internal oscillator and "lock" function, because this
detector for AM signals is as "true synchrodemodulator".
You need not BFO for SSB/DSB signals. But schematics is not latest.
This detector with other, "wideband" LC circuit, you can use also for
FM demodulation.
Best regards Jara Ra
From: Ramon Vargas <...>
Date: Wed Jun 22, 2005 4:58 pm
Subject: Regen doubles as Direct Conversion receiver rvargaspatron
Hello all,
While doing some SW listening with my regenerative receiver I have found
that when gently oscillating it will AM demodulate SW broadcast signals
when the frequency of the oscillation coincides with that of the desired
station. This suggests Direct-Conversion receiver operation. The
oscillation mixes with the incoming signal and the output signal will
just be the desired modulating audio frequency (after filtering out
undesired RF residual components). The audio components are then
amplified by the AF stage and steered to the headphones.
The advantage of this demodulation mechanism is that the incoming signal
will always receive maximum amplification before the mixing process
takes place. This helps a lot when receiving weak signals.
Here's a question for Jara "Rat":
Is this mode of operation quasi-synchronous demodulation?...I think it
is......
Very best regards,
Ramon
...............
| From: "Saulius Karvelis" <> Date: Thu Jul 28, 2005 8:33 am Subject: Synchronous oscillator (SO) |
Links to info about Vasil Uzunoglu low power regenerative Synchronous oscillator US patents :
http://www.unusualresearch.com/AppNotes/SyncOsc/US6667666/us2003011438.djvu
see in djvu file page 37 (doc page 7) [0183] about regenerative receivers
others
http://www.unusualresearch.com/AppNotes/SyncOsc/US4356456/US4356456.djvu http://www.unusualresearch.com/AppNotes/SyncOsc/US4335404/US4335404.djvu http://www.unusualresearch.com/AppNotes/SyncOsc/US4274067/US4274067.djvu
in EDN :
http://www.edn.com/article/CA46326.html
http://www.edn.com/article/CA90225.html
in TAPR:
http://www.tapr.org/ss_g1pvz.html
Here is a beautiful quote from Vasil Uzunoglu (Doctor Synchronous Oscillators):-
http://www.pvnotes.com/archives/2005/03/comments_on_us.html#comments
in Microwave
http://www.mumor.org/public/events/workshop_leuven/Badets%20Leuven.pdf
in radioelectronicschool
http://www.radioelectronicschool.net/files/readings/reading27.pdf
Russian inventor V.T.Poliakov (Владимир Поляков (RA3AAE)) and DRM
http://www.radiostation.ru/drm/phasefilter.html
and direct conversion receiver forum info from page 0 ... to 79
http://forum.cqham.ru/viewtopic.php?t=4032&postdays=0&postorder=asc&start=0
and last shematics
http://forum.cqham.ru/download.php?id=1238
V.T.Poliakov writes book in russian about low power regenerative receivers,
there many simple but effective shematics....
Saulius from Lithuania ...
| From: "Gary Johanson" <...> Date: Fri Jul 29, 2005 8:42 am Subject: Re: Synchronous oscillator (SO) |
--- In regenrx, "Saulius Karvelis" <...> wrote:
> Links to info about Vasil Uzunoglu ( Lots of interesting stuff snipped )
> in radioelectronicschool
> http://www.radioelectronicschool.net/files/readings/reading27.pdf( good reading, i'll have to
check out the entire course )
> Russian inventor V.T.Poliakov >(Владимир Поляков (RA3AAE))
> and DRM
> http://www.radiostation.ru/drm/phasefilter.html >
and direct conversion receiver forum info from > page 0 ... to 79
****** V. Poliakov (or here known as Polyakov)fostered the anti-parallel diode "gate" mixer
now used in quad form with microwave detection. His initial pll diode mixer was described in
CQ, June 1983, in an article actually written by Bozidar Pasaric, YU2HL. In this application
it is being used as a frequency doubler diode "gate" (not to be mistaken with a mosfet gate )
detector which doubles the input frequency from the LO, allowing for a tuner operating at half
the receiver frequency. It effectively blocks out extraeneous AM interference by acting as an
entry "gate", shorting off all frequency except the frequency to which it is triggered, which is
double the LO frequency. It is literally immune to AM saturation and off frequency signals.
The output, from what i understand, resembles nearly a digital signal because the diodes switch
on a 0.6v. and again instantly off when signal voltage ( trigger voltage ) drops below that level.
Rarely seen in US designs for DC and other mixer applications at HF, although i have no idea why.
I also have no idea why i have run into such resistance over the years propagating this mixer.
Ingenious, but then, so is Poliakov.
> V.T.Poliakov writes book in russian about low power regenerative
> receivers,there many simple but effective shematics....
******* Poliakov has, over the past 30 years written for the US Amateur press, not only CQ,
but also in the late '60s for QST. He wrote at the average amateur radio op's level
( like my own typical 7th grade level :>) introducing us to balanced mosfet detectors designed
specifically for use in heavy broadcast RF areas, such as eastern EU. Always on the cutting edge,
i miss seeing his newer stuff. I think his call was RA3AAE, or at least it was back in the early '80s,
when you could regularly qso with the USSR any given morning on 10m.
Any regenerative ideas coming from him i suspect will be very original,
and as i mentioned, ingenious.
Getting back on the Regen subject, there is a lot of room for hobby experimentation
on an elemental level with regens in locking circuits, some of which i am doing on a low level
myself. Since i am far, far from an engineer, i cannot delve into the depth plumbed by the above
mentioned writers, but i can share a bit of what i have done just with my vintage tube/ valve regens.
To keep this post from becoming a Novel, i'll post some of my experiment ramblings on a subsquent post.
Saulius, tnx for sharing those links with us and bringing back to mind a name i haven't heard in years
here on these shores.
gary // wd4nka
| From: "Gary Johanson" <...> Date: Fri Jul 29, 2005 9:15 am Subject: Locked Regens |
Hi, Gang: This is follow up to my last post where i mentioned some experimentation
i have been doing, really more for amusement and curiosity rather than true "research"
with the locking phenomena of Regens. I have heard this being referred to as a form of
phase locking. At or near threshold, most regen ops have discovered that a regen will
"lock" onto a nearby strong signal. Just to see how far i could "drag" a locked regen, i
set up a typicla twinplex rx, and proximity coupled a Collins 70E11 PTO to it's input.
I found that on 40m, i could pull the detector a considerable distance of several kHz
both below and beyond threshold. Below threshold, what i had was essentially a
Direct Conversion process, the input signal being greatly amplified by the regen detector,
and heterodyning against the PTO input signal. Regen control still varied sensitivity,
as did varying the PTO (LO) coupling. At one point i found the sensitivity equal to the
straight regen detector alone! Only now it was nearly immune to signal input vagrancies
such as blocking, pulling (it was already captured by the LO ) and in short, exhibiting every
advantage of a DC detector, only with far greater amplification!
I needed only the typical single stage of audio provided by a triode and headset. As the
BFO tuned away from the Regen detector's input frequency, it's sensitivity dropped as the
Lock function ceased, and the detector was no longer captured. This was probably about
20 or 30 kHz, depending on threshold setting. Thus the regen detector needed, eventually,
to be retuned to the BFO to re-establish the "lock", or capture. Building from this, a separate
BFO was built to match the frequency of the regen detector, both being tuned by single
dual-ganged cap. Thus the detector and BFO could track together, thereby widening the
ability of the detector to tune, as far as the BFO. I am still playing with this type of regen
detection/tuning. It's not new: it was done in the 1930s to some degree. I'm just sorta messing
around with it. But i can readily see that a valve regen certainly CAN be built with the same
features exhibited by the Direct Conversion/ separate HFO type receivers, AND presenting
the same input Q and very high gain levels of the typical regen detector. At least,
**I** was impressed. The dabbling goes on. Hate to grace it with the name "experimenting"
<g> gary // wd4nka
Subject: Re: GB> Injection-Locked Oscillators
Date: Tue, 23 Aug 2005 07:06:22 -0700
I knocked my approach down to just two tubes (a 12AT7 and a 6J6) if I
could get custom crystals. I'm back to looking at injection-locked
oscillators to replace the crystal oscillators and then a single 1MHz
reference for the whole thing that will produce a 5MHz tone as well.
Anyone know where you can buy 1MHz crystals these days? DigiKey and
Mouser don't have any. This is just a side idea that I might toy with as I
would really like to get away from the ten crystal approach I have now.
Chris
,----------------------. High Performance Mixers and
/ What's all this \ Amplifiers for RF Communications
/ extinct stuff, anyhow? /
\ _______,--------------' Chris Trask / N7ZWY
_ |/ Principal Engineer
oo\ Sonoran Radio Research
(__)\ _ P.O. Box 25240
\ \ .' `. Tempe, Arizona 85285-5240
\ \ / \
\ '" \ IEEE Senior Member #40274515
. ( ) \
'-| )__| :. \ Email:
| | | | \ '. http://www.home.earthlink.net/~christrask
c__; c__; '-..'>.__
Graphics by Loek Frederiks
----- Original Message -----
From: "Hans Summers" <>
To: "'Chris Trask'" <>;
<>; "Brad Thompson"
<>
Sent: Tuesday, August 23, 2005 2:38 AM
Subject: RE: GB> Injection-Locked Oscillators
>
> Chris, Brad...
>
> I'm making very slow progress on that all-valve Huff Puff stabilised VFO due
> to too many other commitments and a project queue which is already too long
> and with too many projects underway simultaneously. Familiar story, I'm sure
> :-(
>
> I believe it is possible to make an all-valve Huff Puff stabilised VFO,
> using a low frequency reference crystal (8kHz in my case). The number of
> valves (tubes) need not be excessive, at least, not TOO excessive. An
> example might be:
>
> VFO (1 valve) with some kind of voltage adjustable frequency i.e. VCO really
> Low frequency crystal reference oscillator (1 valve)
> Three stages of phantastron division to get to say 10Hz (3 pentagrids)
> Integrator (1 valve)
>> i.e. 6 valves in total. Details still to be worked out ;-)
>
> It only starts getting excessive, in my case, when you decide to add a
> digital frequency readout too. My plan is: three dekatrons for the low
> frequency counting stages; 3 VS10 trochotrons for the high frequency
> counting stages; a bunch of dual triodes for a prescaler divider for the
> first counting stage; set of 60 cold cathode trigger tubes or thyratrons to
> latch and drive six nixie digits. CRAZY
>
> 73 Hans G0UPL
> http://www.HansSummers.com
>
>
>
>
> -----Original Message-----
> From: Chris Trask [ :]
> Sent: 21 August 2005 19:03
> To: ; Brad Thompson
> Subject: Re: GB> Injection-Locked Oscillators
>
>
> Yes, I've seen his work before. It's a variation of injection locking
> where he has a DC feedback loop to tune the oscillator to the reference
> harmonic. This is very much like another scheme I used with microwave
> oscillators where we used a snap recovery diode on the reference which
> became the LO for a single-balanced mixer using a pair of Schottky diodes.
A
> sample from the microwave iscillator was the RF signal, and the DC output
> went to an opamp. It was a very effective method, and we could lock up
> microwave VCO's up to 18GHz with this.
>
> But, I am determined to make this all-tube, and I'm going to pursue the
> injection-locking method to exhaustion before looking at anything else. I
> did sketch out a method similar to F5LVG which used a dual triode
> single-balanced mixer followed by a DC amplifier that controlled a
> reactance-tuned oscillator. It got pretty busy.
>
> Chris
>
>
> ----- Original Message -----
> From: "Brad Thompson" <>
> To: "Chris Trask" <>;
> <>
> Sent: Sunday, August 21, 2005 10:45 AM
> Subject: Re: GB> Injection-Locked Oscillators
>
>
> > Hello, Chris and the group--
> > If you're not completely wedded to an all-tube design, take a look at
> > Hans Summers' collection of Huff-and-Puff oscillator stabilizers:
> >
> > http://www.hanssummers.com/radio/huffpuff/index.htm
> >
> > He has an all-tube version under investigation.
> >
> > 73--
> >
> > Brad AA1IP
> > *****
> >
> > At 10:31 AM 8/21/05 -0700, Chris Trask wrote:<snip>
> > > I've looked at a few schemes that would lock up a
> > > reactance-tuned
> VCO to
> > >the harmonics of a crystal oscillator, but the amount of circuitry is
> > >overwhelming, as is the power consumption as the approach would
> > >require a harmonic mixer plus high-gain DC amplifiers.
> >
> > > I know that you can lock up an oscillator to the harmonics of a
> refernce
> > >easily by what is known as injection locking, and I used this method
> > >many times in designing low-noise microwave sources that were locked
> > >to fifth
> and
> > >higher overtone crystals. So now the question comes as to how to do
> > >it
> with
> > >tubes. I have some ideas, but I'm certain that there must be some
> articles
> > >from QST or elsewhere that would show how to do this so that I don't
> > >end
> up
> > >reinventing the wheel.
> > >
> > > And I think it was mentioned on this list sometime recently, but
> > > I
> did
> > >not save the post. So, does anyone here know of any articles that
> > >show
> gow
> > >to make a vacuum tube oscillator that is injection locked to a
> > >reference?
> > >
> > >Chris
> > >
>
>
Date: Thu, 25 Aug 2005 12:33:45 EDT
Subject: GB> "Locked" regen detection
I'm somewhat intrigued with the idea of a simple "locked" regen rx.
For some time i had pondered the thought of a tube DC rig, but always
the regen won out by sheer weight of sensitivity, Q and low audio and
RF gain stages. A phase locked regen, however, permits low audio gain
stages, and since the detector is still regenerative, the Q remains substantially
higher than a typical DCdetector. And things remain simple and parts are
relatively few. My own sparse endeavours in this area have been encouraging.
The possibility of xtal "channelising" permitting the sharing of a LO xtal with a
xtal transmitter is also intriquing.
I understand heterodyne type receivers along these lines were featured in QSTs from
the early 30s. I don't have those particular QSTs, can anyone describe what was
done back then? What were some of the observed liabilities or advantages?
Has anything along these lines been published in the 50s or 60s, with newer
tubes, parts, techniques, etc.? ( along these lines meaning a stand alone
receiver, not just as a bfo in a superhet.)
gary // wd4nka
Come and visit!
http://www.qsl.net/wd4nka/
Date: Fri, 26 Aug 2005 07:56:59 EDT
Subject: Re: GB> "Locked" regen detection
In a message dated 8/26/2005 12:30:32 AM Eastern Daylight Time, writes:
Gary, would this idea be useful for CW/ DSB/ SSB modes only,
or do you envision there being some way of using it for AM
reception? -Hue
| From: "Saulius Karvelis" <> Date: Mon Sep 12, 2005 5:03 am Subject: Synchronous oscillator (SO) |
Link to info about experimentation with SO
http://www.amalgamate2000.com/radio-hobbies/radio/synchronous_oscillator.htm
Saulius
From: "macrohenry" <...>
Date: Tue Sep 20, 2005 8:31 pm
Subject: Re: Synchronous oscillator (SO)
--- In , "Saulius Karvelis" <...> wrote: >
Link to info about experimentation with SO
> http://www.amalgamate2000.com/radio-hobbies/radio/synchronous_oscillator.htm
Thanks for this. I and a more accomplished experimenter have worked with a similar SO ckt
and we are independently unimpressed with the results in the context of recovering a signal buried
in noise. If this fellow could present evidence of success in his follow up of that possibility,
I would be very interested in hearing about it.
By the way, the output of such a SO ckt is FM and would need to be demodulated in any
AM detector. Synchronous detection would be great one can get it to work.
Macrohenry
| From: "Jeff Cooper" <...> Date: Wed Sep 21, 2005 6:45 pm Subject: Re: Synchronous oscillator (SO) |
--- In , "Saulius Karvelis" <...> wrote:
> Link to info about experimentation with SO
>> http://www.amalgamate2000.com/radio-hobbies/radio/synchronous_oscillator.htm
> > Saulius > > >
This kind of circuit is an example of what some people call injection. A circuit with feedback circuit
is fed energy in an appropriate band of frequencies and the circuit oscillates at the injected frequency.
If the feedback is tunable then you may be able to achieve some selectivity. But I'd wonder output
dynamic range and close-in signal interaction. The idea isn't far from a tunable Q-multiplier circuit.
Regenerators used in extending telephone T1 circuits are close cousins too. PLLs with insufficient
power supply rejection can be inadvertently "injection locked" by in-band signals coupling through
the power supply. The EDN article somewhat over-claims the circuit's advantages and makes
misleading statements about PLL circuit capabilities. But it's worth investigating injection oscillators
where they work. By the way, some versions of television horizontal and vertical sync locking circuits
were forms of injection oscillators. They were purposefully designed to accept a certain bandwidth
so they could "lock" onto the particular composite video signal with tolerance for signals of very slightly
differing frequencies.
Coop, aa1ww
| From: "v2x2002" <> Date: Tue Jan 10, 2006 7:54 am Subject: Synchronous oscillator (SO) |
Link to Philco TV theory, cohered oscillator on page 51
multivibrator on page 19, 48 and other interesting tubes shematics
from Philco Apple Receiver Documentation Bibliography
http://www.myvintagetv.com/Apple%20PDF%20files/report_M123.pdf
Saulius
| From: "v2x2002" <> Date: Thu Jan 12, 2006 1:08 am Subject: Synchronous oscillator (SO) |
Link to Professor Behzad Razavi one of latest journal papers
http://www.ee.ucla.edu/~razavi/papers/Journals/RSep04.pdf
Saulius
From: "Saulius" <>
Date: Sat Feb 11, 2006 10:10 am
Subject: SO
I corect long link and mistake about valves type used in my IQ DRM Decoder
for receive DRM - Digital Radio Mondiale with open source last version software Dream
http://pessoal.onda.com.br/rjamorim/dream.zip
Decoders hart ( 2 x EF86 ) born from long modification of SO's and Regen's
http://www.smail.lt/~ncss/regen_info/MyIQDRM_Decoder_for_DRM.jpg
For info see previuos message... Best regards; Saulius.
| From: "Saulius" <> Date: Mon Feb 13, 2006 3:23 am Subject: SO |
Greetings Continuation info about :
My SO - Regen - Autodyne - DC - Receiver - Q Multiplyer (preselector) 500khz ... 29500 khz
with frequency counter 1 EL86 front end +
2 x EL86 (6P18P Russian) - Sinchronous oscillator,
6N6P (6H6P - Russian) +
2 x LM386 with audio filter adjusting
Power source +12.6V and + 150V not visible
wood from oak screen on the wood from cooper
Schematic page 1:
http://www.smail.lt/~ncss/regen_info/MySO_Regen_Autodyne_p1.jpg
Photo:
http://www.smail.lt/~ncss/regen_info/My_EL86_SO_bottom.JPG
http://www.smail.lt/~ncss/regen_info/My_EL86_SO_from_behind.JPG
To be continued ... Best regards; Saulius.
From: "Saulius" <>
Date: Tue Feb 14, 2006 3:52 am
Subject: SO
Greetings
Schematic page 2:
http://www.smail.lt/~ncss/regen_info/MySO_Regen_Autodyne_p2.jpg
Continuation info about :
My SO - Regen - Autodyne - DC - Receiver - Q Multiplyer (preselector) 500khz ... 29500 khz
with frequency counter 1 EL86 front end +
2 x EL86 (6P18P Russian) - Sinchronous oscillator,
6N6P (6H6P - Russian) + 2 x LM386 with audio filter adjusting
Power source +12.6V and + 150V not visible
wood from oak screen on the wood from cooper
Schematic page 1:
http://www.smail.lt/~ncss/regen_info/MySO_Regen_Autodyne_p1.jpg
Photo:
http://www.smail.lt/~ncss/regen_info/My_EL86_SO_bottom.JPG
http://www.smail.lt/~ncss/regen_info/My_EL86_SO_from_behind.JPG
To be continued ... Best regards; Saulius.
| From: "Saulius" <> Date: Thu Feb 16, 2006 2:20 am Subject: SO |
Greetings
May be interesting info about my IQ DRM Decoder and minimal Shifted PSD by Dream
http://drm.sourceforge.net/forums/index.php?showtopic=156
Best regards Saulius
From: "Saulius" <>
Date: Thu Feb 16, 2006 8:00 am
Subject: SO
Greetings
New schematic for 4...7 Mhz
About one year ago I experimented with regenerative - autodyne receiver
(influence info in Yahoo Regenrx and Glowbugs group, thanks gary // wd4nka and other )
what obtains is in shematic page 1:
http://www.smail.lt/~ncss/regen_info/IQ_SO_4_7_Mhz.gif
Shematic powered with paint library from Sergei Komarov
http://www.radiostation.ru/home/usilitel-gfx.html
His very interesting home page (in Russian)
http://www.radiostation.ru/home/museum.html
Best regards; Saulius
From: "Saulius" <>
Date: Sat Feb 18, 2006 8:54 am
Subject: SO
Greetings
Switched coil pack for my SO regenerative - autodyne radio receiver 500khz ... 30Mhz schematic:
http://www.smail.lt/~ncss/regen_info/Coil_Pack.GIF
construction description on SO bottom photo
http://www.smail.lt/~ncss/regen_info/My_EL86_SO_Coil_Pack.JPG
Best regards; Saulius
| From: "Saulius" <> Date: Tue Feb 21, 2006 1:57 am Subject: Re: xUSSR 6F12P tube |
--- In , Andy UR3IJC/A <...> wrote:
> > Hello friends
> > I'm just playing with very new regen transceiver design, but i'm not sure with tube choice.
> I don't like exclusive constructions and prefere to use usual tube types. So, question:
> > Is my lovely baby 6F12P usual tube for the western people? Well, i can to use ECL86 as wel as this one,
> but with 6F12P i can obtain much more gain (19 mA/V) for less filament curent (300mA). It shuld be portable..
> > -- > 73! Andy UR3IJC/a http://www.qsl.net/ur3ijc
>
Greetings Andy and Other
In my SO regenerative - autodyne radio receiver creating I attempt use xUSSR 6F12P tube in all cascades.
>>6F12P i can obtain much more gain (19 mA/V)
thats good but so it is hard to obtain evently regeneration point and SO generation becomes suddenly and
sharp for autodyne conditions (even if U anode < 50V)
SO generation may go to superregeneration on frequency about 15000 khz
for soft oscillation not need 19 ma/V
I live in 14km from FM radio ( 88 ... 108Mhz) transmiters antena where about 10 hight power chanells .
6F12P may generate to 200Mhz and pentode with hight frequency sharp and short characteristic.
Need stop hight frequency parasitic generation and detection.
My SO with 6F12P good detects this FM radio signals - this bad for me.
When I use 6F12P pentode or triode parts in front - end grounded screen and my antena realy
80m long delta loop this short pentode characteristic not ensure hight dynamic range amplification.
I find: for diferent 6F12P production specimen - very diferent characteristics tolerances and
electrons noise when use in my SO.
I use 6F12P only in all audio amplifier - construction very good and compact.
It very economic valve - filament curent (300mA).
How 6F12P works in short - wave frequency transmitters , I dont know.
Best regards; Saulius
From: "Ramon Vargas" <...>
Date: Fri Feb 24, 2006 10:05 am
Subject: Re: [Homebrew Transistor Radios] Synchronous Oscillator rvargaspatron
Saulius,
You are welcome!
You may want to read:
"Notes on the Demodulation of AM Signals" in the files section of the group.
It contains some meditation on how weak-signal AM demodulators do their work.
Best regards,
Ramon
From: "Saulius" <>
Date: Sat Feb 25, 2006 5:25 am
Subject: Synchronous oscillator v2x2002
Greetings
Vasil Uzunoglu low power regenerative Synchronous oscillator US patent :
http://www.unusualresearch.com/AppNotes/SyncOsc/US6667666/us2003011438.djvu
Michael Hebert: Synchronous Oscillator
>The circuit is a regenerative detector with "signal controlled
>regeneration". Notice the point about performance being better with
>weak input signals... same as the classic regennie, IOW, this buggah
>will block on strong signals! Nevertheless, it offers some valuable
>assets not the least of which is antenna isolation. Having the signal
>waveform control the oscillator frequency should circumvent the
>problem of offset LO frequency that is the bane of DC receivers. An
>input attenuator would be a worthwhile addition to the circuit and
>some form of rf blocking will be necessary on the output to keep the
>oscillator signal out of the audio chain.
Ramon Vargas: Regen doubles as Direct Conversion receiver
>While doing some SW listening with my regenerative receiver I have
found
>that when gently oscillating it will AM demodulate SW broadcast
signals
>when the frequency of the oscillation coincides with that of the
desired
>station. This suggests Direct-Conversion receiver operation.
>The advantage of this demodulation mechanism is that the incoming
signal
>will always receive maximum amplification before the mixing process
>takes place. This helps a lot when receiving weak signals.
Gary Johanson: Locked Regens
>At one point i found the sensitivity equal to the
>straight regen detector alone! Only now it was nearly immune to
signal input vagrancies
>such as blocking, pulling (it was already captured by the LO ) and
in short, exhibiting every
>advantage of a DC detector, only with far greater amplification!
Gary Johanson Locked" regen detection
>And since it was operating at or below oscillation, radiation
>would still not be a major problem.
macrohenry: Synchronous Oscillator
>The patent holder says the SO is an AM to FM converter, more
>precisely, AM to PM. When the input is an amplitude modulated
>carrier, the output is a constant amplitude phase modulated carrier.
>One peculiar property is that the SO output is a phase modulated
>carrier, not amplitude modulated. It's a couple of volts so the diode
>doesn't have to deal with low voltage. I'm able to demodulate it with
>a 1N34. I reckon this is slope detection, right? I expect there is a
>better way. Any ideas for a simple phase demodulator?
>By the way, the output of such a SO ckt is FM and would need to be
demodulated in any
>AM detector. Synchronous detection would be great one can get it to
work.
By this ideas I made my SO - Regeneratyve - Autodyne receiver.
Very interesting analize process by software receiver DREAM and
hight sensitivity frequency counter
AM radiostations signal >> Antenna >> Atteniuator >> SO >>
Atteniuator >>
ICF7600G >> IQ DRM Decoder >> Creative Audio >> Computer >>
DREAM in analog demodulation mode
When SO operates below oscillation I use AM demodulation Dream mode
When SO operates at low or strong oscillation I use narrow band
frequency
demodulation Dream mode ( as writes DREAM developers )
Input PSD Screenshorts like prof. Razavi theory
http://www.ee.ucla.edu/~razavi/papers/Journals/RSep04.pdf
fig.9 (c)
when signal frequency far from the SO self lock range
- no signal FM demodulation
fig.8 (c)
when signal frequency nearly the SO self lock range
- bad FM demodulation
fig.14
when signal frequency equal SO frequency
- good FM demodulation, hight selectivity
It is not simple self phase demodulator it is software,
but may be idea take IQ shifted audio or IF signals and make
very simple phase demodulator ?
IQ DRM decoder base on 2 x EF86 valves is self quadrature oscillator,
detector, mixer, amplifier ( we can take 14 khz output from anode
circuit
and throw out low frequency amplifier cascade ) with smaller
phase noise than one separate osciillator.
May be one known how make this IQ valve decoder
simple with tranzistors ?
What are you think about use varicaps in SO LC ?
http://www.smail.lt/~ncss/regen_info/MySO_Regen_Autodyne_p1.jpg
http://www.smail.lt/~ncss/regen_info/MySO_Regen_Autodyne_p2.jpg
http://www.smail.lt/~ncss/regen_info/MyIQDRM_Decoder_for_DRM.jpg
http://www.smail.lt/~ncss/regen_info/IQ_SO_4_7_Mhz.gif
http://www.smail.lt/~ncss/regen_info/titulinis.html
Best regards;
Saulius
2006 07 07
Regenerative receiver German WWII Torn and "recreating" history from Sergei Komarov
http://www.radiostation.ru/home/museum/11manual.html
