[GreenKeys] tapping ST-6 for RS232

[WA5CAB at cs.com]

I'm not picking on Joe.  But simply using what he wrote as an example of 
what's puzzling me.

I never used any of the civilian converters back in the day so I'm not 
familiar with their transmit capability.  I assume that for AFSK (for VHF AM 
transmitters or to drive an SSB or ISB HF transmitter) they would have a block 
diagram similar in a generic sense to something like the AN/SGC-1.  But I don't 
understand how you could get HF FSK output from one that was comparable in 
stability to the VFO's or PTO's of the contemporary better quality civilian to 
high-end military HF transmitters.  At least without having the cost of the unit go 
into the stratosphere.  The converter would have to include a very good HF 
oscillator or an IF one with mixer compatible with whatever transmitter it was to 
be used with.

In a message dated 1/26/2009 12:09:38 PM Central Standard Time, k0bx at arrl.net 
writes: 
> Well I was one of them.. I used my ST-6 to drive the RS Color Computer on 
> receive and the Color computer to drive the AFSK (AK-1) for transmit.
> 
> If you look at a ST-6 circuit diagram, you will see that the 'FSK' of the 
> ST-6 normally drives the AFSK unit.  I broke the connection there and sent the 
> FSK (which is +- 12 volts) to the input of the Color computer and the output 
> of the Color Computer to drive the AFSK in the ST-6.
> 
> I did not come up with this, but I believe I got the information from Bill 
> Henry at Hal.  Anyway, the FSK out of the ST-6 is sorta like a RS-232 as it 
> takes the HV Loop and converts it to +-12 Volts.
> 

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