USB Cable weirdness with MultiFlex in V3

  • 1
  • Problem
  • Updated 1 year ago
  • (Edited)
When I am running both the M front and SSDR my USB cable that drives my Elecraft KPA500 and KAT500 is getting erroneous slice data. It appears that both the M and SSDR is reporting the same Slice.

Example: If I have USB cables configured for Slice A then if I use A on the M it commands the equipment, but if I also A on the SSDR it gets commanded. Same for B.

But then there is a case when I set the cables config to work on Slice D and Slice C on the SSDR will command it. And it may change on next time I run SSDR.

Without MultiFlex it tracks fine.

Also if USB cables is configured to work with TX Slice or TX Pan it also gets confused.

As for the Active Slice option I would have thought that if the M is running then SSDR would populate it's first Slice as then next in line Slice position (e.g. If the M just had A active then starting SSDR would have B as it's first slice).

So as it stands now using the USB cable to drive an external device could become hazardous.
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Gary NC3Z

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Posted 1 year ago

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Ed.G, Software Engineer

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Official Response
When using multiFLEX with USB cables additional considerations need to be taken into account. Since each client can have it's own TX slice, active slice, and/or A/B slice the USB cable configuration may have to change. 

For amplifiers (and other devices inline with the transmit path) the recommended configuration is to set the source of the USB cables to TX Antenna and assign it to the physical output that the amplifier is connected to (ANT1 or ANT2). This allows two clients to operate independently if they are using different TX Antennas just like a single client. 

If both clients are using the same transmit antenna, the USB cable will report the frequency of the last client that transmitted. If a different client transmits (not the last transmitter) then the USB cable will report the new frequency and then transmit. In this configuration, an appropriate TX Delay may have to be set to allow the hardware to change to a new band. 

You can also set the USB cable source to TX Slice which will function the same but it will not be dependent on the TX Antenna. This can be helpful in certain situations but for amplifiers (since they are physically connected to a TX Antenna port on the radio) the TX Ant source is preferred.