I have to agree with Colin. Although they'll all work just fine, the final
results may be less than what you may be expecting. Used with an R-390,
390A, et al, you have a fine combination. Also, I'll add the Hammarlund
HC-10 to the list.

I have an RME-4350A receiver with the RME-4301 Sideband Selector. The
setup works well, but the 40dB unwanted sideband supression seems a bit
optimistic. The critical issue is the accuracy of the phase-shift
network. I suspect that component drift over the years has degraded
the performance of these devices.

Ed
Canyon Lake, TX