I am Taka, JP3EXR and am Japanese 2m EMEer.
Mike, W9MDB came to my PC and helped me with remote when happened problem of I run two FT8 of JTDX on this PC. Mike do you remember me? I'm still using my two old transceivers ( IC-746pro, called IC-7400 in Japan ) in EME. For the EME until now, in JT65B case I run two JT65B of WSJT9.7 r3639 on one PC. But Joe, K1JT recommends WSJT-X is working well, so I installed WSJT-X Ver 2.6.1 for two JT65B, two Q65A and two FT8 on one PC. I made each program with the rig-name of the desktop Icon. So I was still having two Q65A and two FT8 of WSJT-X. Then I tried to run two JT65B of WSJT-X on one PC but it's having trouble now. I don't think this kind of problem will occur if you use it normally as run just one JT65B of WSJT-X on one PC. In my case, on the receiving, I am using two IC-746pro transceivers to receive each EME signals on H and V-pol to two input each audio ports on one PC. On the transmitting, I am using the same output audio port for two JT65B of WSJT-X for the transmitting and I am transmitting with just V-pol side of IC-746pro. Therefore, I run two JT65B of WSJT-X on one PC. My trouble is that when one side JT65B repeats transmitting and receiving, the another not transmitting side JT65B remains in the decoding state. This trouble occurs in the period of 50 seconds to 60 seconds after JT65B on the transmitting side finishes transmitting and started receiving. Of course, JT65B on the decoded state side will no longer after be able to decode. It was recovered by restarting when JT65B on the side where the failure occurred. Of course even H-pol side transceiver is transmitting the same time with the PTT port of the RIG when I am transmitting. So the H-pol side PC does not received from the input audio signal with the receive side transceiver when IC-746pro is transmitting. Therefore, I think this trouble is unable to be prevented even if the input is stopped by hardware. Just in case, I tried to make an audio cutoff circuit and tested it. However, the problem could not be avoided with that circuit. By the way, run two Q65 or run two FT8 of the same WSJT-X version does not have the same this problem. Although it is not realistic, I tested it with mixed JT65B and Q65A. It's works fine. So I think this problem probably occurs when two JT65Bs are used at the same time. I posted even after I checked if the cause of the trouble was on the PC. So my PC was Win10 OS and i5 CPU so it was not fast. Then I replaced the CPU to fast i7 CPU of the PC but it OS is Win 10. The CPU usage rate when running two JT65Bs is about 10%. Thank you for reading my not so well English. Best regard. Taka, JP3EXR
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