[HBR] Regen Birdies

[Lorne Barber]

Hi Ron, Bill and the group.

In 1955, as a 17 year old, I also built  the 6SN7 regen from the handbook.
It was not a success story. I heard little on it, mainly due to a power full
BC station nearby.  Forty years later I again built the same regen, from the
same handbook. This time it worked better, but not spectacular. Since then I
have gone on to built two ZL2JJ receivers and the 6SN7 rig sits on the
shelf, along with the slat board 6L6  as a reminder of years gone by.
This has nothing to do with birdies, just a story that came to mind when I
read Bill's posting.

7 3 
Lorne
VE7BOX  

-----Original Message-----
From: HBR [mailto:hbr-bounces at mailman.qth.net] On Behalf Of Bill Cromwell
Sent: January-14-15 5:32 AM
To: hbr at mailman.qth.net
Subject: Re: [HBR] Regen Birdies

Thanks Ron..

..for your prompt reply and right to the point. I had not thought of running
the regeneration way up as my use is for CW and occasionally SSB. The
narrower passband near that critical sweet spot is more desirable. I have
started on a SimpleX Super, a variation on a supergainer - superhet with a
regen detctor. After that one I want to revisit the 6SN7 regen from the old
handbooks - the one I build in my early teens. I would like to do a better
job of it this time. There is no rf amp and I don't intend to add one. I'll
keep this in mind and see what happens regarding those particular birdies.

73,

Bill  KU8H


On 01/13/2015 03:38 PM, Ron Barlow via HBR wrote:
> Hi Bill,
>   My 24A/27/27 regen does not have an RF stage. Many of the "old time"
regen circuits, that I have seen, used untuned RF stages, and thus would
have shared this particular "birdie" response issue.
>   I don't remember for certain (that happens a lot these days!), but I may
have had the regen control advanced beyond the most sensitive position (at
the very threshold of oscillation), at the time that I observed this
phenomena. I suspect that this would increase the magnitude of this "birdie"
response, due to an increase of harmonic energy output, from the oscillating
detector.
>   Anyway, I just wanted to pass along what I believed to be a rather
interesting and perhaps unusual problem.
>                             73 de Ron n4gjv
>

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