OK a question for a GE radio Buff

[LowderK]

Years ago back in 1988 I lived in Ruidoso NM, there was not any cellular service there so if you wanted mobile phone like services you either used Lincoln Communications or Caprock Communications.... the company I went with was with was Lincoln Comm. Ok here is the question we used GE MPI radios with keypads and a switch on the top marked VG and ..? do not remember the other ( many years ago) but if you tried to monitor someone's else's phone call the landline side was in the clear but when the wireless user talked all you heard was the "GE" jingle (we bring good things to life) no words just the jingle in tones,,, does anyone know or remember any systems like this...? everything out there was in the 450-470Mhz band... anyways just curious...

 

[merlin]

Yea, those were decent radios, fitted with keypads and 2 tone decoders. Channeled for the RCC phone system.
Reason monitoring you hear only one side is they were duplexed channels
I go back further with a GE PE set up for RCC, that was before cellular existed.
Any mobile or portable phone was RCC or Ma Bell.
Some of the mobiles and briefcase phones were full duplex, no PTT and just like landline.