Tony,
If the com port pin stays at -9volts, then the COM port is not "doing
its thing".
I trust you used a 'scope to look measure it. A DMM will not likely
respond quickly enough to see the positive going pulses.
Try another COM port.
73,
Don W3FPR
On 7/14/2016 10:45 AM, N2TK, Tony wrote:
I am having brain freeze. I must have changed something but not sure what.
Both K3's had been working fine on FSK using MMTTY for years. I can still
receive fine, but I can't transmit on either.
I am using LP Bridge which is talking fine to either K3.
When I hit Xmit in MMTTY the program shows it is sending, but it does not
key the K3.
All along I have been using COM 1 on my PC for FSK keying. I have been using
pin 3 to Pin 1 on the Acc K3 socket. I have not used Pin 7 (PTT) to Pin 4 on
the K3.
When I measure voltage on Com 1 pin 3 it is -9V. When I hit Xmit in MMTTY it
stays at -9V.
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