John,
You said:
"WL will talk to the radio for perhaps a minute, then the connection fails."
I think you should look at this more from the perspective of:
"The Radio will talk to WriteLog for perhaps a minute, then it stops".
Serial port control, while used by WriteLog, is a function of the operating
system. It could be hardware, it could also be your operating system.
Your thought about the IRQ is a good one, and the less things on an IRQ, the
better - despite the claims that PCI hardware can share interrupts.
73,
Bob N5NJ
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