The chosen frequency can be supplemented by an analogue tone or a digital code (not both). If a tone or code is used by the transmitting radio, the receiving radio must be set to the same code or else the message will not get through.
There are 51 different standard analogue tones ranging from 67.0 Hz to 270.4 Hz (plus no tone at all being the 52nd option).
And there are 83 different digital codes with values from 023 to 754. These are not interchangable with the analogue tones.
Not all PMR radios will offer all the tones and codes.
So to set your radio you must:
* choose one of the eight frequencies
* then chose either an analogue tone value OR a digital code OR neither.
Away you go!
Oh yeah, real easy Greg
Why can't it just be as simple as 'let's all use channel 7'???
Ok, we can't but that's the way it should be.
Come the revolution..........
..and I thought wiring up the autocom hiding the 7 miles of assorted wires, plugs lalala was the hard bit.... 

