
Got the email whizz

Basics of UHF now are
(as Brock says) 77 channel, they say 80 but 22 and 23 are reserved for telemetry (cow cockies turning on/off pupms and stuff), 5 and 35 reserved for emergency use, the rest basically open slather.
The "extra" 40 channels are spaced between the original 40 so 1 - 40 are still the same frequency but 41-80 start at "1 1/2" if you like and go up.
No real concern for users to know BUT 1 -40 on the "old ones" will still talk to 1 - 40 on the "new ones"

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The TX4600 Brock linked to is not ideal for bikes even though it looks the goods, too many have had water ingress

even thogh they are supposed to be "Economical Waterproof Design (IP55)." needs to IP 65 or better to be in the weather.
GME and Uniden are like Ford and Holden, do the job and good quality. Icom is more along the BMW/Merc, built a bit better and costs more. (left out bike referances to not offend anyone

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I can mate any UHF (or 2 way radio for that matter) into a StarCom1 or our BikeComm, BUT i gave up supporting the opposition some time back, so anyone with "another intercom" will have to fend for themselves

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My recommendation is the Uniden UH-076 or 078 handheld with RAM mount or the Undien "car type" ones as they give better tansmit clarity than the GME car type ones (yeah yeah I know the TX3100 is on my site as an addition and the Uniden isnt (YET)). And the GME TX680 or TX6100 come in close behind the UH-076.
Hope that helps out without confusing too many