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VHF - FM - Repeater - Project DB0HGW
repeater control
The repeater is controlled by a simple microcontroller 87C51 with 8kB
eprom internal. That's why the circuit arragment is quite simple. It is
built on universal drilled board. The whole control module is housed by
a tin plate box (100mm x 160mm x 30).
In hardware version 1.0 the following functions (together with the software)
are implemented:
PTT control, generating audio tone with call, squelch and 1750 Hc detection (digital),
APRS channel monitoring (especially for APRS interlocking in case of radio signal)
Hardware Version 1.0 circuit diagram:
audio control and speech proccessing
This circuit was developed and published by Matthias Fehr, DL4MF, in
CQDL 12/2000 page. 892 or use the CQDL-download area clipper.zip .
view in the control module of the repeater
REPEATER in german only ! |
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