Rolla 146.820- Repeater

The Rolla 146.820- Repeater, PL 110.9 Hz, went online on Monday, June 1, 2020.

The repeater consists of a Motorola MSF-5000 110-Watt repeater with a Sinclair Q2330E 6-cavity duplexer to provide over 100 dB of isolation between transmit and receive.

The site uses an SCOM 7330 Repeater Controller to handle all repeater and link radio audio and control the site cooling fans. A Duracomm DPS-75 with SL-Rack provide power to all equipment other than the repeater.

Linking is done with a Motorola CDM-750 40-Watt link radio with a Commscope DB-436C 10 dBd gain yagi at ~ 200′ AGL directed Southwest toward the Bendavis hub repeater. The link antenna is fed with Commscope AVA6-50 1-1/4″ heliax.

Rolla 146.820- Repeater (Front)

The repeater utilizes a Comprod 872F-70TM antenna with 5.5 dBd gain mounted at 310′ AGL on the South leg and directed South-Southwest at 120-degrees. The antenna is fed with ~ 330′ of Commscope AVA5-50 7/8″ heliax

The repeater is installed in a climate controlled, hardened environment to withstand the worst of conditions. The equipment utilizes a building UPS and a backup power generator on site to ensure the repeater is available when it is needed.

Special thanks to the following for supplying equipment for this repeater helping to make it a reality:

  • Jim Colville, W7RY
  • Missouri Hospital Association
  • Commscope

Numerous amateur radio operators have also made cash donations that helped pay for the installation of the antennas and coax cables on the tower.

146.820 (-) Repeater (Rear)
146.820 Repeater antenna (Top Right just below tower light) mounted at 310′ AGL
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