Re: QST August 1936 Regen.
- --- In firstname.lastname@example.org, Bill M <radioexray@...> wrote:
> Here's the schematic and most of the text.
> radio1885 wrote:
> > Hi John
> > The article is available to ARRL members at their internet site.
> > I plan to try the method on my breadboard regen.
> > Look for the schematic in the regenrx group photos.
> > I not sure if the screen voltage divider(R1,R2)needs to
> > through the RFC to (-)ground?scanner this end (Yet).I knew someone your side of "The Pond" would
> > Could the screen be part of the feedback path?
> > bob...w2ami x wn2ami 1962
>>> HI BILL/ALL.Thanks for posting the schematic,I do not have a
be sure to know it,hi,hi.I LOVE those old Prewar QST's such
interesing circuits/ideas in them.Intend to try this idea when time
permits !!!,interested to hear results if anyone beats me to
it ???.John G1WOS.Bristol UK.
- Hello Regenrx,
In the early 1960's, I needed a CW receiver since I was about to go for my
My Dad had purchased for his parents back in the early 1930's an Atwater
Kent superhet with the Short Wave bands up to 22MHz I think. He said that I
could work on it.
I also needed a CW Transmitter and planned on building one up from a "How to
Become a Radio Amatuer" article using a 6DQ6 Xmtr, on an old Philco radio
chassis that I had stripped down to the power xfmr and the 365mmf variable
There was a "Hints and Kinks" or "ARRL Radio Handbook (circa 1960)" article
about making the I.F. Stage of a receiver oscillate so that a carrier could
be heard as an audible chirp.
The article said, I think, something about removing the bypass capacitor of
the screen grid, and then attaching a wire to capacitively couple it to
another part of the tube that would get the thing to oscillate. I remember
putting a potentiometer in the cathode to adjust the gain of the tube so
that I could control the regeneration. Does this sound familiar to anyone?
Is there anyone out there that has a copy of the article on this or knows
where I can get one? If I have asked about this before, there was a major
computer crash over here last week.
Regards to All from Rick, K1WYH
- It's a little difficult for me to believe that
this circuit has "no effect on tuning" as #1
the capacitor is a reactive component that
#2 is part of the feed back circuit ( Colpitts
oscillator using tube interelectrode
This feedback control method is seen in the
Frank Jones 1930s circuits with regenerative
IF detector. I haven't seen other circuits claiming
its use for example to 28 MHz. I'd wager that
it is worse than pot control of screen voltage
as for frequency stability with regeneration level
change. -Hue Miller K7HUE
- --- In email@example.com, "Hue Miller" <kargo_cult@...> wrote:
>HI HUE.Well I suppose any circuit will become sensitive to change as
> It's a little difficult for me to believe that
> this circuit has "no effect on tuning" as #1
> the capacitor is a reactive component that
> #2 is part of the feed back circuit ( Colpitts
> oscillator using tube interelectrode
> capacitances )
> This feedback control method is seen in the
> Frank Jones 1930s circuits with regenerative
> IF detector. I haven't seen other circuits claiming
> its use for example to 28 MHz. I'd wager that
> it is worse than pot control of screen voltage
> as for frequency stability with regeneration level
> change. -Hue Miller K7HUE
it enters oscillation.I tryed a colpitts with screen grid
control,this had slight pulling when just in oscillation,was handy
for fine tuning ssb on 20mtrs !!.Intend to drag out my
"Experimental" chassis and try the QST circuit,BUT must change the
Tube sockets to Octal first !!,those pesky miniatures are just to
damn small to work on in these "Senior" years,hi,hi.John G1WOS.
> BUT must change theI know what you mean. As electronics gets more modern (miniature
> Tube sockets to Octal first !!,those pesky miniatures are just to
> damn small to work on in these "Senior" years,hi,hi.John G1WOS.
tubes), I seem to become less modern. Maybe I should pre-empt my
inability to work with octals and just put in sockets for big-pin
tubes. There are big-pin equivalents for many octal designs. And
aside from the audiophile ones (10, 45, 50), the big-pin tubes seem
reasonably available and affordable. I'm fond of the 27, myself.
– John KG4L