Ed, that does help. Thanks for your detailed reply.
I modified my computer to radio FSK transmit interface, removing the 2N4402
PNP transistor, and connecting TXD (pin 3) of the DB9 serial connector through
a 1K resistor to the Mark/Space input on the rear of the OMNI VI Plus just as
you described. FSK transmit works now. Using the PNP transistor as shown on
http://www.aa5au.com/rttyinterface.html for the OMNI VI Plus did not work for
me. Direct through a 1K resistor does.
73,
Marsh, KA5M
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