Hi Fred, It would probably be more accurate to call it a cross band port hole or window unless both bands are full repeaters with audio and COS/COR working together.
It's been done many times with both mobiles and portables with an example like the Motorola Radius/Maxtrac Radios wired "back to back". One of the group members here wired two HT (portables) into a repeater, which could just as easily be converted to a cross-band port hole (window). I've seen that project twice at the Dayton Hamvention and it looks pretty nice. I've wired the Icom 2at and 02at (and higher band) portables into both cross-band and full repeater operation. The hardest task is dealing with (finding) valid receive signal logic from the receiver... used to provide the PTT (transmit) direct or through some type of controller circuit. Some people use voice detection to make/provide a COS/COR logic, some folks "tack on" a CTCSS (PL) Decoder and some actually open the radio to find a usable "tap point" in the receiver circuit. Depending on how tricky (and how much money) you want to invest in the package... voice operation can work, or it can be quirky, jerky and a real pain to deal with. An Icom 2AT "probably blows" enough CTCSS tone through the regular speaker audio output where you could easily tack a decent CTCSS Decoder on for decent full CTCSS Operation. No kits yet... but I'm thinking about it... cheers, skipp www.radiowrench.com/sonic > "Fred" <fj...@...> wrote: > Hello: > I would like to build a low power 5 watt cross-band > repeater for 2m/440 use. I recall seeing this set up > using 2 HT's, also 2 mobile rigs. Has anyone built > something to suit my needs, or are there kits available? > Thank you > 73 de Fred W1POP
