Re: Deep Dive Question: FDM-SW2 to FDM-DUO method of control #comport #fdm-duo #fdm-sw2 #wsjt-x #fldigi

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.
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.
Neil G4DBN

-------- 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

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:
  • Any application, like WSJTX or FLDIGI will request frequency and mode over the outbound COM port assigned within the application (I saw the data going outbound on COM port)
  • Any application will receive the frequency and mode over the inbound COM port assigned within the application (and I noticed that the inbound is ALL shared when using VSPE, same inbound info is sent to all inbound devices, including FDM-SW2 RX devices (saw the data coming inbound on COM port)
--- but here's the kicker ---
  • I noticed that if you change the frequency of any RX channel (like RX1, RX2, RX3, or RX4) from FDM-SW2 app by sliding the bar, it does change the FDM-DUO VFO frequency, but there is no CAT data transmitted from the FDM-SW2 RX COM out port
Which leads me to my hypothesis that the when the slider on FDM-SW2 is moved on any RX, the resulting change in frequency on the radio must not be going over the CAT COM port, right? It must be going over the other USB where the radio/SW2 integration is being done?

Why do I care?  I don't know, I guess it will help me debug if problems surface.

73, Patrick KM5L

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