Two way radios

[Snowreap]

there are no sub-channels.

on any one channel, only one person (in your vicinity) can talk at once. the only thing the feature marketed as "sub-channels" does, is make it so that you can configure your radio to tune out everybody except for the people with the same configuration setting as you're using. they're still talking on the same channel, you just can't hear them because your radio is ignoring them.

but anybody who has that feature turned off can hear everybody on that channel, so it does not increase privacy in any way, and it certainly doesn't increase channel capacity -- two people using different "sub-channel" settings can't both transmit on the same channel at once and expect their transmission to be heard by the desired listeners.

-ken