[HBR] I.F. information

[Hopperdhh at aol.com]

Derek,
 
I started to answer this when you first posted it, but I'm not sure if I did 
or not.
 
Some CB radios used 1600 KC IFs.  Also, some low cost 6 meter ham 
transceivers, and the Aerotron VHF FM transceivers.  I used two of the Aerotron IF units 
in a HBR that I have not finished yet.  They were overcoupled so I put a 
shorted turn between the windings which made them about right (critical coupling).
 
Years ago, I removed turns from 455 Kc cans to make them resonate at 1650.  
This probably lowers the Q somewhat from optimum, but they worked fine.  The 
coupling remained about right, but this was pretty tedious work.
 
Hope this helps,
 
Dan K9WEK
 
 
In a message dated 3/16/2007 6:18:17 PM Eastern Standard Time, 
maudie.widd at blueyonder.co.uk writes:

Hello,
I am an ex radio service engineer who lost his sight in 1970 who has decided 
to build a double conversion receiver.  Due to my situation the reciever has 
to be a valve model.  I have found a good circuit diagram which I obtained from 
PW June 1962 but am have been unable   to locate a source where I can obtain 
I.F. transformers suitable for use with EF95 EF93 and 6BE6 valves.  The I.F. 
transformers I need are 1.6 Mcs chassis mounted types but I am sure I would be  
able to adapt whatever.  I have almost all the other components except for 
these items and I don't think I could wind them myself that's if I could find 
the formers and cans.  Can you suggest a source.

Derek G4ESQ
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