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. (it allows you to take a hand-held into a restaurant, for example). They accomplish their mission via a diplexer. Yes, many use a single, multi-band antenna. I had a Yaesu mobile that worked like that and now use an ICOM which does the same thing. To make this work effectively, you need a way to shut off long tails on a repeater as cross bands typically do their work based on COR (carrier operated relay). If the repeater has a long tail, you must wait for it to drop before transmitting (on the cross-band side). I don't know the specifics of either rig you mention, but the principles are all the same. Hope that helps. -- Larry W1HJF rapp at lmr dot com
