Forget about it. Those are set up for duplex operation but are so specialized it would not be worth the effort. The High band IMTS phones only had a single oscillator element that controlled both transmit and receive. The IF was the same as the difference between the transmitter and receiver (5.26 MHz). For example channel YK the mobile received 152.66 and transmitted on 157.92 MHz. The control module filled the top of the radio and used discreet transistors to decode the 1800 / 2000 Hz signaling tones and the IMTS idle tone at 2000 Hz. This was pretty hot stuff for 1969! It actually worked pretty well, and the price kept the users count down to where you could find a channel most of the time to make a call! The low band systems used a channel split of 8 MHz and the UHF stations used 5 MHz. The control head had a handset and a rotary dial to make a call, the decoder had a contact closure so it could be used to honk the car horn when you got a call.
Back in the early days of UHF repeaters there were a few of the Delco phones that found their way into ham service, but the Regency HR-2 pretty well killed it off! Jack K6YC ----- Original Message ----- From: Riley Frazee To: [email protected] Sent: Sunday, March 25, 2007 6:08 PM Subject: [Repeater-Builder] Moto Pulsar 120 I have a Motorola Pulsar 120 S Mobile Telephone that was used before cellular phones. I am told that one can modify this radio to become a repeater. I know nothing about this radio/phone. How many watts, channels, VHF OR UHF, or even if this spefic model can be modified to a repeater. I have searched google and yahoo and msn to see what I could find out about this 120 S model and I was very unsuccessful. If anyone has any information that they could pass along to me that would be great. Riley.
