On Tue, 20 Feb 2007 18:01:07 -0800, Josh Assing
wrote:

How can I test/see/read the nema sentence being sent from the radio to be sure
it's leaving the radio

What kind of sentence are you expecting the radio to send? Usually it
works the other way around with the radio receiving positional
sentences from the VHF.

To answer your question, you can read the data on your PC using the
hyperterminal utility under Programs Accessories Communications.
You will need a serial cable and working COM port.

Settings are usually 4800 baud, 8 data bits, no parity.