For Evan and Alan - mostly,
I observe pretty much what you describe. ?My notes:
1) Win10 laptop, not recently rebooted. WSJT-X not running. ?Power, dummy load or resonant antenna, and USB cable connected to QCX, which is powered off. ?USB cable connected to PC.
2) Apply power (9v) to QDX, wait for steady LED. ?¡°Digital Audio Interface (QDX Transceiver)¡± appears in Win10 System Settings, Sound Panel, Master Volume at 100.
3) Launch WSJT-X. ?14.074000 appears as the set frequency. ?This is the startup default I set with PuTTY. ?This appears even if I had previously set the frequency to 7.074000 before closing WSJT-X, so it is being as a. AT command from the QDX. ?No signal decoding appears (when antenna connected, of course) and the audio bar graph is at 80. ?The WSJT-X Settings shows, for Audio: QDX selected; for Radio: TS-480, COM3, Test CAT works, Test CAT PTT causes LED To flash.
4) Close WSJT-X. ?Power off QDX for ~30 seconds, then power on.
5) Launch WSJT-X. ?Everything now works normally, signals decoded.
I built my QDX for 9 volt operation, so as to minimize risk to the BS170 transistors from a reactive load. ?I do not have a suitable 9 V power supply, but several 12 V supplies, so put a TO-220 7809 regulator in a small die-cast aluminum box with 2.1/5.5 mm power jacks on each end, with a toggle switch and LED, as shown in the photos. ?Then I use a cable with power plugs on each end to connect this to the QDX. ?The switch has been quite convenient in all this!
73, Ben ?K0IKR
