[Boatanchors] Cheap & Easy Selectivity

Carl km1h at jeremy.mv.com
Thu Aug 20 12:38:34 EDT 2009


I dont see it in Edition 1, 4, 8, or both 9 editions.

Do you have a better reference?

Also in 1929 the IF's were mainly around 175 kc or even lower.

Carl
KM1H


----- Original Message ----- 
From: "Edward Swynar" <gswynar at durham.net>
To: <hbr at mailman.qth.net>; "homebuilttuberadios" 
<homebuilttuberadios at yahoogroups.com>; "Old Tube Radios" 
<glowbugs at piobaire.mines.uidaho.edu>; <AmRadGear at yahoogroups.com>; 
<boatanchors at mailman.qth.net>; "Welcome to the Novice Rigs List!" 
<novice-rigs at mailman.qth.net>; <antiquewirelessassociation at egroups.com>
Sent: Thursday, August 20, 2009 11:13 AM
Subject: [Boatanchors] Cheap & Easy Selectivity


> Good Morning All,
>
> I just ran across a sweet little article in a 1940 issue of the old 
> "RADIO" magazine on a fool-proof way of adding selectivity & gain in an IF 
> stage that (supposedly) approaches that obtainable with a resonant crystal 
> filter...but without the filter insertion loss, of course.
>
> The design is rather obscure in that I've never seen anything quite like 
> it in any ARRL publication. Suffice it to say that it goes a bit extra 
> beyond the mere "...place-the-plate-lead-into-the-IF-can" approach of 
> achieving feedback, yet it still looks very "do-able", and I plan to 
> incorporate it into my 1929-style 12-tube superhet here.
>
> If anyone has access to any of the West Coast Handbooks of the late 30's, 
> you'll see the design used in the "Super/Ultra Gainer" receiver designs 
> described therein...
>
> Wish me luck!
>
> ~73~ Eddy VE3CUI - VE3XZ
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