[GreenKeys] BC-610

[WA5CAB at cs.com]

Dale,

I did it the way that the Army did, with an outboard exciter jacked into 
the BC-610 TU's crystal socket. The exciter I built was built around a BC-221 
I acquired sans cabinet and calibration book. Which I early on classified 
automatically as a parts unit. I had a VFO that some Navy subcontractor had 
built for the BC-610's at Reserve Centers in 8ND (that I was underwhelmed with 
the performance of). I used its cabinet with the 221 front panel removed 
and the chassis mounted to a 19" rack panel the same height as the cabinet. 
The 60 mA loop keyer circuit used the common diode switched variable capacitor 
for setting shift. The only caveat was that if I wanted to patch the keyer 
into a switchboard circuit, it had to go into the bottom row on the 
switchboard, where the jack sleeves go to B- of the loop supply.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 1/28/2014 2:28:34 PM Central Standard Time, 
herbert3 at centurytel.net writes: 
> 
> Dale,
> 
> Since you are talking about a WWII radio I assume you are old enough to be 
> familiar with mature circuits. If you check a 1960's era ARRL Handbook you 
> will find simple circuits for FSKing both crystal and VFO oscillators. On 
> page 334 of the 1960 edition you will find both assuming the use of vacuum 
> tubes..
> 
> And if you move up a few years to the 1971 edition which I got from Dave 
> Hackl, K0HCD, you will find "solid state" equivalents. I can't provide you 
> with any claims of "experience" since I never even bothered to build the FSK 
> board for the ST-6 and always used AFSK for the local QSO's popular in 
> those days.....
> 
> If you happen to have access to Ron Guentzler's articles in RTTY Journal 
> he sort of passes off the topic as being a simple matter of "switching a 
> capacitor on and off of the frequency determining circuit" of a transmitter. I 
> guess he was on the leading proponents of using radio theory for political 
> purposes!
> 
> Yes, I did have a BC-610 but used it only as a source for radio parts 
> (1954).
> 
> 73
> 
> Lee k9WRU
> 
> ----- Original Message ----- 
> 
> >> From: dhagert 
>> To: greenkeys at mailman.qth.net 
>> Sent: Monday, January 27, 2014 10:40 AM
>> Subject: [GreenKeys] BC-610
>> 
>> 
>> Has anyone FSK’d a BC-610 transmitter? Looking for an easy way to do it.
>> 
>> 
>> 
>> Thanks
>> 
>> Dale W0IR
>> 
>> 
>> 
>> 
>> 
>
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