[WriteLog] messages and ptt

[Jerry Pixton]

All,

I am beginning to see an increase in the number of occurrences where PTT 
does not get correctly asserted. And I am seeing a correlation with the use 
of AFSK vs FSK.

This would show up during a long run of CQ messages when I would suddenly 
realize that even thou I was seeing the message on the rtty window I was 
not hearing my linear. And indeed if I depress the PTT footswitch, the 
transmitter keys. Or if you click the cq message (I use Fkeys, so I don't 
know what would happen if I depress F1 for example) it would key the 
transmitter but send out two messages.

I had both rigs using FSK for a long time and rarely saw this problem (only 
when I was doing some fancy mouse clicking and then I think the state 
information got messed up).

In the last two contests, I switched one rig back to AFSK so I could use 
its better filters (centered at 1500 hz) and now that rig is showing this 
problem. While I was '"running" on the rig using FSK the problem never 
showed up. And that is the same rig that use d AFSK before and would always 
mess up.

So somehow there is a timing problem with PTT being asserted by rig control 
while using AFSK (sound board latency? ) that doesn't occur when FSK is used?

Jerry, W6IHG
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Dr. Jerry R. Pixton, PIXOS Designs LLC
http://www.pixos.com/designs/RadioTuner/
jpixton at shentel.net
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