Thanks - it’s good to know that I can ignore this particular error message. I still can’t get observations to complete though … still more faultfinding to do.
Antenna switching is done with two remote coax relays (VHF/UHF and L-Band/S-Band) in boxes on the mast and one in-house relay (thin VHF/UHF coax / thick L/S-band coax) right before the Pluto, all controlled by a Pimoroni Automation Hat. I’ll take some photos when it all works!
Software is based on this thread:
and lightly modified for this environment.