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Post 7 made on Wednesday February 24, 2021 at 17:50
Founding Member
November 2001
URC actually called me back!  And explained my problem!

It does have to do with the two RF inputs being wired in parallel.  Seems that you can have two RFX-250s (and I assume two RFX-250i) plugged in, one using the 3.5mm phono jack and one using the 3-prog phoenix jack without a problem.  However, you cannot mix them - i.e. you cannot have a 250 in one and a 250i in the other. can mix 250 and 250i receivers if you wire them all to just the phoenix plug.  I tried this and now both the 990 and 990i remotes work.  Great!

But, unfortunately, it did not fix the problem of using two remote at the same time like I had hoped. Pressing button on both at the same time still seems to confuse the MSC-400 :(

So, I might try breaking out a second MSC-400 (or a 350 I have lying around) as a slave to see if THAT config will allow it to happen.

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