[AMRadio] RCA BTA1S 80M conversion?

[Charles Ring]

On 8/29/2012 1442, Donald Chester wrote:
>> Has anyone ever added a keying circuit to a ham-converted BC
>> transmitter and used it for Morse or FSK?
>>
>> *Charles Ring W3NU*
>
> I converted a Gates BC1-T to 160m and added CW capability.
>
> I cathode key the exciter stage, using a TV sweep transistor as a
> switching transistor inserted in the cathode circuit.  It keys the 200
> MA of cathode current of the pair of 807s very nicely.  I also key the
> 12BY7 stage that drives the 807s to eliminate backwave. I also added a
> LC filter to round off the sharp edges of the waveform that were causing
> key clicks.
>
> I had to make two additional modifications.

Thanks, I figured someone has done it and that it involved a lot more 
than the obvious. i wonder if older AM BC transmitters would be easier. 
The BC1T was designed to be smaller, lighter and cheaper than its 
competitors and thus it prompted Gates being called disparagingly the 
"Quincy Tin Works".

-- 
*Charles Ring W3NU*