FM880 Repeater


WARG's 2M repeater network is based on the Philips FM880 which is the radio telephone rack mounting version of the FM828 mobile.

These circuits show the considerable modifications to the FM880. The basic receiver, exciter and PA remain basically unchanged, apart from the direct FM modification to the exciter.

To make an amateur repeater considerable additions have to be made to the basic FM880. These circuits were all designed and built by WARG.


FM880 Project Introduction

True FM Modulation

Speaket Amp and Weak Signal Mute

Time out pip

CW Filter LV det URC101 version

AGC amp

DTMF control pre-URC101


FM880 Audio Line Up

FM880 Link Interface