Repeater
The UCSC Amateur Radio Repeater operates full-time on 145.310 (-) PL 94.8.
Coordination: NARCC.
Call sign: W6SLG
Antenna: 7/8 wave vertical (Diamond) on top of the old engineering building: BE1
Power: 25 Watts.
Transmitter: Maxtrac
Receiver: Maxtrac
Duplexer: Wacom WP639 (5 inch cavities)
Basic Repeater Controller: NHRC-2
Extended Control Interface: Custom
K3RRY and AC6P designed and built the custom interface to extend the functionality of the NHRC-2. It provides external analog and digital computer interfacing as well as fan and operational temperature control. The heatsink for the Maxtrac used for the transmitter was changed to one Motorola originally intended for higher duty cycle usage. By adding two 3.5 inch high-velocity fans, the transmitter is capable of 100% duty cycle. Schematics of this unit are available below:
- Block Diagram of the basic system concept.
- Radio Interface.
- Fan Driver.
- Status and Power.
- Power.
- PCB screen shot of the 2-layer board (generated using Cadence Allegro 16.5).