At 4/24/2007 07:34, you wrote: >Jason Cato wrote: > > > > > > Can someone tell me what equipment I will need to cross band repeat a > > Uniden SMU4525KT UHF into an Icom 2100H VHF? I want to be able to > > move around my property with my H/T, and still be able to get into > > repeaters my H/T can't reach. > > > > Also, can I use the same multi-band antenna for both at the same time > > with a diplexer? Or would the VHF transmission kill the UHF > > reception, or vice versa? > >Well, I can't answer all, but I can answer some. Typically, small >cross-band repeaters are HALF duplex, not full duplex. That means the >receiver of one is connected to the transmitter of another (on a >different band). This is the way many mobile rigs which do this work.
That's not the definition of "half duplex" that I've been using. To me, "half duplex" means that transmission occurs on a different frequency from reception, but only one at a time, not simultaneously. Full duplex is simultaneous transmission & reception using separate frequencies. In both cases, whether the two frequencies are within the same amateur band or not is irrelevant. So one could in fact operate "full duplex" on a dual-band radio if it has simultaneous transmit & receive capability. Bob NO6B
