Neil Smith G4DBN
Hi Patrick, you only get a CAT response if you send a CAT request to the USB CAT port in one of the modes where the DUO is in standalone or standalone plus 192kHz. As you suggest, SW2 does not use CAT for setting frequency of the DUO. You will see an update in the stream from the 9 pin port if the VFO frequency is changed. If you are using SW2 with the DUO in remote rather than standalone, then I don't know what the stream output does.toggle quoted messageShow quoted text
Similarly, if you send one of the supported CAT requests to the 9 pin port, and change a VFO frequency, there would be no output on the USB CAT port, but the stream output would be updated.
I've been doing a lot of research today, just trying to figure out the interaction of frequency and mode control between the DUO and the other devices. Here's what I've noticed using the VSPE monitor, and using VSPE splitter and devices attached:
-------- Original message --------
From: Patrick Bouldin KM5L <patrick@...>
Date: 23/09/2019 04:47 (GMT+00:00)
Subject: [EladSDR] Deep Dive Question: FDM-SW2 to FDM-DUO method of control #COMport #FDM-DUO #FDM-SW2 #WSJT-X #FLDIGI
Why do I care? I don't know, I guess it will help me debug if problems surface.
73, Patrick KM5L