The WI9MRC repeater is a commercial Motorola Quantar operating at 100 watts and equipped with an ultra-high-stability oscillator to ensure excellent frequency accuracy and reliable long-term performance.

System control is provided by an Arcom RC210 Repeater Controller, offering advanced control, monitoring, and remote management capabilities. RF filtering is handled by a Sinclair Q2330E Res-Lok 6-cavity duplexer, providing high isolation between transmit and receive paths for optimal repeater performance.

The antenna system consists of a Sinclair SD214-SF2P2SNM four-bay exposed dipole array, delivering strong coverage and dependable signal performance. The antenna is fed with CommScope 7/8-inch hardline, minimizing feedline losses and maximizing effective radiated power.

To ensure uninterrupted operation, the repeater is configured for 24-volt DC-only operation and is backed by a battery system comprising four C&D Technologies BBG AGM batteries with a total capacity of 440 amp-hours. Battery charging and maintenance are provided by Victron Energy.

This design allows the MRC91 repeater to remain fully operational during commercial power outages, providing reliable communications and emergency service capability when it is needed most.

Summary

• • • • Motorola Quantar VHF Repeater – 110 Watts
      • Motorola 5 Cavity Internal Preselector (Receiver)
      • Motorola Ultra-High Stability Oscillator (5 MHz reference standard with stability of ±2 ppb)
      • Arcom RC210 Repeater Controller
      • Northcomm Technologies Interconnect  cables (Quantar to Controller)
      • Sinclair Q2330E Res-Lok 6-Cavity Duplexer (Isolation of 91 dB)
      • Sinclair SD214-SF2P2SNM 4-Bay Exposed Dipole Antenna (Nominal gain of 8.0 dBd with 1/2 wave element spacing)
      • Times Microwave Lightning / EMP suppressors  x2 (RX, TX bulkhead type)
      • PolyPhaser inline gas discharge lightning arrestor (Antenna Feedline)
      • CommScope 7/8″ Hardline Feedline (Duplexer to Antenna)
      • CommScope 1/2″ Hardline Jumpers (Repeater to Duplexer)
      • Four C&D Technologies BBG AGM Batteries (440 Ah total capacity)
      • Victron Energy 24V/20A smart charger
      • Antenna elevation of 1,355 feet above sea level provides exceptional wide-area coverage
      • DC-Only Configuration for Continuous Operation During Power Failures
      • A distinguished Milwaukee amateur radio landmark for nearly 50 years
      • Access the repeater using 146.910 MHz -600 kHz input with PL 127.3

     

    In addition to its robust primary infrastructure, the MRC91 repeater system is supported by a fully operational spare repeater and an inventory of critical spare components, including amplifiers, exciters, receivers, station control modules, and power supplies. This redundancy significantly reduces downtime and helps maintain reliable communications. Combined with commercial-grade equipment, extensive battery backup, and a high-performance antenna system, MRC91 provides dependable communications for everyday amateur radio operations as well as emergency communications support.