[HBR] Building an "IF strip" in a separate box

[Shoppa, Tim]

Such things (homebrew dual-conversion IF strips) have appeared in handbooks in the past. Let me look over my 50's era HB's when I get home. They certainly assume easy availability of IF transformers. I remember one with at least two or three different selectivity chains all in cool lines...

Certainly, post-WWII, it was extremely common to get a surplus BC-453, modify it more (sometimes a complete change of input frequency range) or less (often just rewiring the filament string and supplying B+) and call it the "tunable IF strip". In fact, in September 1959 QST W2PPL proposes calling this configuration the "HBR-453" in homage to Ted Crosby, but there were several QST articles a year in the late 40's and 50's using BC-453's and every other surplus receiver as IF strips.

Tim N3QE

-----Original Message-----
From: hbr-bounces at mailman.qth.net [mailto:hbr-bounces at mailman.qth.net] On Behalf Of C Eus
Sent: Friday, May 14, 2010 8:15 AM
To: hbr at mailman.qth.net
Subject: [HBR] Building an "IF strip" in a separate box

Hello to all:

I am considering building the 1610 and 100 kcs IF strip into one single
"strip" type chassis.  In my past experience, I have seen something similar
in some of the surface search radar and IFF equipment I have worked on while
in the Navy aboard a frigate. I thought the concept was neat since one could
simply change out the entire strip (and work on it later) while I spare took
its place.  Has anyone done anythign similar with this in tube radio
building? Any possible drawbacks?  Thanks. Cal. N6KYR/4
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