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.
I trust you have been using an NPN transistor between the RS-232 output (+/- 9V) of the serial port and the TTL input (0 to +5V) of the K3 ACC port. If you are not using Radio Command and have not connected Pin 7 of the serial port to pin 4 of the K3 (again using an NPN transistor), I do not know how the K3 would ever switch to transmit. 73, ... Joe, W4TV 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. MMTTY is setup as follows: - Misc tab - COM-TxD (FSK) - TX tab - Port Com1. - I am not using Radio Command K3 - PTT-KEY is OFF-OFF. One K3 has KIO3A using RS232. The other has KIO3B using USB. Also if I ground pin 4 on the Acc socket it does not transmit. Tried another Com port and made the change in MMTTY but the same result. What could I have inadvertently changed so that the Com 1 Pin 3 to stay at -9V? Tnx for any feedback. N2TK, Tony ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
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