Your post doesn't make 100% sense yet as to what you're after.
Originally Posted by
Papa Tom
If I could only figure out a way to keep my Motorola FRS walkie talkies open for 2-way communication all the time, I'd figure out a way to mount them to the handlebars and be done with it.
Bold added.
In radio terminology there are two methods of communicating:
1. Simplex - This is direct radio-to-radio on the same frequency ("sim" meaning 1)
2. Duplex - This is more complicated in that it has to make use of a "repeater". Your signal is split between 2 frequencies (hence the term "duplex", the "du" meaning 2) - when you transmit your radio switches to the input side of the repeater so that the repeater hears your transmission. When you unkey your radio it switches to the repeater output so it can hear what ever comes through the repeater.
Both of these modes are "1 transmission at a time". Your PTT button (or VOX, if you so choose to use VOX - but as I mentioned before it is a PITA for high noise environments like vehicles and bikes) is what switches between transmit and receive.
[There are a few different definitions of simplex and duplex, but what I listed above is how I have customarily heard them referred to as. "Half Duplex" and "Full Duplex" complicate things further - where telephones are commonly described as "Full Duplex". Though, repeater use in two-way radio terminology is always "Duplex", and radio-to-radio is always "Simplex". Outside of two-way radio terminology those terms mean different things in that Simplex is a 1 way transmission, such as a broadcast FM station, and Half Duplex is a 2 way radio [cornfuzed yet?])
Your cell phone or landline phone does not operate this way. Phones have both lines open all the time - transmit and receive. You can't do that with a conventional radio because only 1 frequency can be active at a time and that frequency carries 1 audio signal.
Verizon, I believe, used to have a walke-talkie mode, for lack of a better term, that would use the CDMA, TDMA, or GPRS signal (cellular encoding) direct between 2 phones (no cell tower). I do not recall exactly what the mode was called, but I believe (I could be wrong) would allow the same transmit/receive of audio at the same time direct between phones.
I am not aware of any other wireless technique or service between 2 devices (like a phone or radio) that does not operate in either simplex or duplex mode as described above - where only 1 side of the conversation is active at a time. Even digital radios (like P25, Mototrbo, DMR, DPMR, Fusion, and DStar), though they encode very much like a cellular signal, are only 1 side of the conversation at a time as best I know. I've run DMR/Mototrbo and Fusion and that is how those run, for sure, unless there is a special attribute Motorola has that is proprietary to Trbo and not compatible with DMR that allows both sides to be active at a time.