[GreenKeys] FSK Keyer Information Request

[wa2hwj at att.net]

Russ,

The ST6 puts out a plus/minus "FSK" voltage that follows your
series-connected keybaord/printer loop signals. The diode/cap/choke circuit is all you should need. I used the same circuit with my Drake Line and even in my old HT37. Simplest way to install: put parts on a perf board, attach near the VFO tube (make suree you have a good ground), unplug your VFO tube, stick a thin wire in the cathode socket pin, and plug the tube back in. 
Then, fiddle with the variable cap to get your shift. Beware that in some rigs the shift will be different on each band (if your rig is an old timer that doubles/triples the VFO output for each band). This is a lot easier than when I had to use a 6AL5 in my Heath VF-1! 
Nowadays, I shift my Kenwood TS870S by using a small open-collector keying adaptor that goes in series with the Dovetron's loop. The adaptor then keys the FSK input on the rig.

73, 
Jack WA2HWJ

NNNN


-------------- Original message from Russmill47 at aol.com: -------------- 

> I'm currently working to get back on the air after a long lapse in RTTY 
> operation. My ST-6 TU and M28ASRs are fine. I seem to have lost my FSK Keyer 
> over the years. Since my transmitter is CW / AM only, AFSK is not an option. 
> 
> Looking back to RTTY Journal from September 1967, in Irv Hoff's Mainline 
> TT/L-2 article, I see that I need some basic parts, such as a RFC, a diode and 
> an NPO type miniature ceramic trimmer. It looks like I can locate similar 
> parts from Newark. But before I do, what do folks who wish to stay with FSK use 
> for an FSK Keyer today? Is there anything new that I should know that works 
> well with the ST-6? Any and all advice is appreciated. 
> 
> 73, 
> 
> Russ 
> WA3FRP 
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