spangles44 wrote:
We are a small firm in South Devon that still use two way radios for dispatch and normally everyone can hear everything going over the radio drivers included. However, yesterday, without warning we have now found that the office can speak to the cars and the cars can speak to the office but the other drivers cannot hear what other cars are saying which is useful for things such as other drivers not knowing addresses etc. Can anyone make any suggestions before we get a specialist in please. We have changed the radio set and we have a repeater but I would not have thought that this would make any difference would it?
What you have now is "Duplex", what you had before is "Simplex".
In Simplex one frequency is used, so if you "Press to talk" (PTT), usually by pressing the mic button, you transmit but can't receive, let go of the button and you receive but are not transmitting.
In Duplex two frequencies are used, when you PTT you can still receive.
It is possible that the car radios are receiving both frequencies, the base station may have been switched to Simplex and it has sent instruction via the radio system to the car sets to do the same. This depends on the radio system and facilities it provides of course.
Look for a button that has options for D or S, maybe Dup or Sim and switch it to Simplex.
The advantages to Duplex I outlined on here before, quite some time ago, I will see if I can find the thread.