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VHF - FM - Repeater - Project    DB0GWD

Prolog

After long consideration in our local HAM radio league we start a reworking of 

our FM VHF repeater (145.675 Mhc) at the beginning of 2001. It was done to aim

better operation performance, reduce offen appeared interferences and reducing

power consumption, achieve state of the art and not least to revive the public

responsibility for the repeater in our local radio league.

Main subjects are

+ redesign of preamplifier after electrical destruction of input part of the crystal antenna filter

+ built/program a simple repeater control with remote control based on 87C51

+ built a new innovativ NF signal control with 1750 Hc detection and audio filtering and controlling

REPEATER CONTROL

PREAMP/CRYSTAL FILTER

DUPLEXER

REPEATER DOCUMENTATION C-SOURCES updated:01/11/02 in german only !

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