[600MRG] The quest for the ultimate regenerative receiver

Tue Feb 20 13:17:21 EST 2018

Eric,

My friend Michael Laronda, WA1OMI loved regens.  He  had  told me one of
the best circuits was the one that had an  infrared LED and a corresponding
solid state infrared detector - I don't know the name of the part - but
this was in the oscillating detector circuit and eliminated radiation of
the oscillation RF.

I think I found such a circuit.  See pdf attached.

73
DR
N1EA

On Tue, Feb 20, 2018 at 12:14 PM, <kl7aj at acsalaska.net> wrote:

> I've always had a regenerative receiver or two lying around the shack.
> Since I'm getting into 630 meters, I thought I'd build a new regen for that
> band, just for jollies.
>
> Contrary to a lot of literature out there, all regenerative receivers are
> not the same. Some of the newer versions, such as MFJ's are pretty good,
> but there's room for improvement. A lot of the later designs are based on
> the assumption that "a little positive feedback covers a multitude of
> sins." While true in theory (the autodyne function is indeed capable of
> infinite gain and sensitivity, regardless of the open loop parameters), in
> practice this is not the case. After playing around with a LOT of regen
> receiver designs, here are two truths that make all the difference in
> performance.
>
> 1) Use the HIGHEST Q tank circuit possible. Do NOT rely entirely on
> "Q-multiplication" to make this work. A decent regen receiver will work
> "reasonably well" without any regeneration.
>
> 2) Design the RF amplifier to have the highest OPEN LOOP gain possible.
> You only need a gain of slightly more than 1 to make an oscillator
> oscillate....this is NOT the best idea for a regen receiver. Again, the
> receiver should work "fairly well" before adding any feedback/regeneration.
> In an attempt to make modern regens "user friendly" i.e., not touchy,
> manufacturers have been using gain control, such as by adjusting the bias
> or adjusting the emitter resistor value, to created some degeneration. This
> practice SERIOUSLY degrades performance. The old school "tickler coil"
> method for adjusting regeneration is STILL the superior method....by a long
> shot. Yes, it's touchy....but when you get the hang of it, the magical
> regen performance of ages past really comes to life.
>
> In the near future, I will present some oscilloscope shots of my optimized
> 630 meter regen.
> Stay tuned!
>
> Eric
>
>   ---
> Eric P. Nichols, KL7AJ
> AlasKit Educational and Scientific Resources
> 3763 Lyle Avenue
> North Pole, AK 99705
> (907) 488-0483
> (907) 371-7120
> http://alaskit.co
>
> On Tue, 20 Feb 2018 15:49:00 +0000, Neil Klagge wrote:
>
>
> I was interested to read this by Wolf DL4YHF in his manual for his
> QSOversion of WSQ, where he talks about how it is (or might be) used in
> Europe:
>
>
>
> ''*By default (or "convention" amongst MF users in Europe), tune your
> receiver to 474.2 kHz in USB, and leave the 'base frequency' (=audio
> frequency of the lowest WSQ tone) set to 1000 Hz. That way, you can have
> WSQ, WSPR, and JT9 (WSJT-X) running on the same PC, connected to the same
> receiver."*
>
>
>
> I see no problem with this for NA users of WSQ2, especially now that the
> default tone spacing is the same 1.46xxx hertz that WSQCall uses, which
> yields a signal width of only 50 hz.
>
>
>
> Can JT9, FT8, and WSQ all share the same 800-1350 hz area on our 630m
> band? If not, why not ?? Just a question for friendlydiscussion.
>
>
>
>
>
> Thanks for ur thoughts....
>
>
> 73
> Neil,w0yse, CN85rq
> Vancouver, *WA*
>
> My ham radio websites: http://w0yse.webs.com/and http://wg2xsv.webs.com
>
> My Faith website: http://neilsfaith.webs.com/
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