[Boatanchors] Command Set Receiver Audio Transformers REV-1

[Bill Cotter]

Hello all,

Attached is the first revision of Command Set Receiver Audio 
Transformers paper I compiled while trying to figure the 
differences in about 20 of these old receivers. Included are actual 
measurements to confirm what has been found in the literature.

Addition, corrections, and criticisms welcome.

73 Bill N4LG

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I have been in the process of repairing and upgrading several old 
command set receivers with the goal of getting a stack of these 
functioning on 160M, 80M and 40M. And, eventually getting the 
matching transmitters back into working condition.

One thing that has bothered me over the past month are all the 
differences in audio output transformers that were used in these 
radios. My goal was to get them all set to work with 600Z output.

After digging through a lot of tech manuals, conversion manuals and 
magazine articles, I have figured out what I didn't understand 
about the types and choices of the output transformer used in all 
the common sets. When I go through the process of researching 
everything about a topic, I compile my notes for when I forget down 
the road, hi!

Attached are my notes on the BC-4XX and ARC/R-2X receiver audio 
transformer options. Hopefully, these notes can save someone else 
from a lot of head scratching.

Any comments, corrections, contributions, etc are welcome.

73 Bill N4LG