I have 3 Motorola CDM750s that I’m using to build a multi-purpose, portable, temporary repeater. There are 1 VHF and 2 UHF radios. I want to be able to use it as either an in-band UHF repeater or as a UHF/VHF cross-band repeater. I have a duplexer tuned to the UHF frequencies I plan on using and a UHF/VHF diplexer for the cross-band configuration. The antenna will be a Diamond X30A dual band base/repeater antenna.
I would like to make it fairly simple for someone to change the configuration. I wonder if I could run the duplexer and diplexer in series so it would be unnecessary to reconfigure the antenna cabling. Basically, the 2 UHF radios would go to the duplexer and then the antenna feed from that goes to the UHF side of the diplexer, where it combines with the VHF feed.
I realize I’ll have to use the same input frequency on both the in-band and cross-band repeaters, but that’s not a big deal.
Is there any reason why this wouldn’t work?
If this is a bad idea, I would appreciate alternate suggestions.