a while back I posted about our dealer introducing new 450 greenstar radios and at the same time our one year old 900 radios not working worth a crap.
The dealer got cheap on us and used one coax wire to run both signals if that makes sense, they used the thick center portion of the wire to broadcast the 450 signal and somehow rigged the 900 wire through the thin outer portion of the coax. I do not understand how all this works but it is the best information we could get, "and we learned this by accident" as to why our old radios suddenly did not work the same.
The only somewhat good thing that came from the "come to Jesus meeting" was they agreed to take our four old radios on trade for new ones.