[HBR] Regenerative communications receiver

[Martin Marris]

Thanks Brian. 

I've ordered those back issues -- sounds very interesting.

I've built a couple of regens in the past few years. The first one was an
ARRL-designed "three transistor" Novice set from 1968 which works quite
well, considering its relative simplicity. The other one is under
construction at the moment. It started out as an attempt to design a
portable regenerative set for use while hiking, but quickly morphed into
something more elaborate, with hopes of building a "high performance"
regenerative receiver using design tips from the 1920s and'30s. It uses
subminiature, battery-powered 1AD4 pentode tubes (about the size of a
fingertip). The current build has five tubes in four stages: RF amp,
regenerative detector, AF amp and switchable CW audio filter. It is the
first receiver that I can claim to have "designed" myself rather than
building from a kit or a published design. However, to say I did it "myself"
is a big exaggeration: I got masses of advice from the Elmers over on eham,
and several times was saved from making embarrassing mistakes!

You can read about it here:
http://www.eham.net/ehamforum/smf/index.php/topic,103101.0.html.

Best,

Martin

-----Original Message-----
From: HBR [mailto:hbr-bounces at mailman.qth.net] On Behalf Of Brian Burns
Sent: Saturday, May 30, 2015 16:28
To: 'HBR Receiver List'
Subject: [HBR] Regenerative communications receiver

Hello All,

 

Since things are quiet on the HBR list, and Kees says that discussions of
other receivers are Ok, I thought that I would mention an interesting
regenerative that I've run across in Electric Radio.

Vernon Yeich, KB3RQE, wrote a couple of construction articles, first in ER
#227 and then in ER #241. He has followed those up with an article in ER
#301 entitled "A CW Receiver With a Double Tuned Regenerative Loop", with a
number of changes to the original design. All these back issues are
currently available from Electric Radio.

I certainly don't understand all I know about this radio, but it looks like
Vernon has attempted to incorporate some of the various refinements that
hams were coming up with at the end of the regenerative era, say the
beginning of WWII. He quotes some very impressive selectivity numbers, and
the design has some features not normally found in a regen.

Cheers,

Brian

 

 

 



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