Repeater Sites, Equipment & Maintenance Log

Network Architecture in Plain English

A repeater network may look mysterious to the average operator, but when broken into parts, it is simply a chain of radios, filters, antennas, and power systems that all cooperate to extend communication range. Below is a plain-English walkthrough of the components and why they matter.

  • Controllers – the brains of the system
     A repeater without a controller is like a car without a steering wheel. Controllers make decisions: when to transmit, when to identify, when to switch to a link, or when to shut down during a fault. They are programmed with timers to prevent “stuck mic” situations, courtesy tones that signal the repeater is listening, and logging functions so the technical team can look back on what happened.
  • Link Radios – the glue between sites
     Imagine you want to talk across valleys, or across counties. A single repeater only covers its own footprint. Link radios act like long-distance messengers, connecting one mountaintop to another. Sometimes these links are microwave dishes the size of pizza pans; other times they are narrow-beam antennas on UHF or VHF. When aligned correctly, they make the system seamless, so that someone on the east side can talk to someone on the west without either knowing which tower carried the call.
  • Duplexers – the selective gatekeepers
     A repeater must listen and transmit at the same time, often using one antenna. Without a duplexer, the transmitter would overload the receiver instantly. Duplexers are heavy metal-cavity filters, tuned to pass only the specific receive and transmit frequencies. They provide the separation needed so that both paths coexist. Tuning a duplexer is part science, part art; small adjustments can make the difference between clear audio and constant desense.
  • Power Systems – the lifeline
     The most carefully built repeater fails instantly if power is unstable. Most sites draw electricity from the grid, but backup power ensures continuity. Battery banks can keep a site running for 10–20 hours. Generators provide longer autonomy, especially on remote mountain tops where storms routinely knock out utility lines. Some sites are experimenting with solar arrays that supplement both grid and generator.
  • Monitoring & Telemetry – the early warning system
     Technical teams cannot sit at every site, so remote telemetry acts as eyes and ears. Sensors measure voltage, current, RF forward and reflected power, inside temperature, and even door-open events. This data flows back through a control link or internet connection, allowing volunteers to spot problems before users notice them. For example, a steady drop in battery voltage may trigger a work trip before the site goes dark.

In short: controllers think, link radios connect, duplexers separate, power sustains, and monitoring alerts. That is the backbone of the network.

Site Profiles

North Ridge Site

  • Location type: Prominent hilltop ridge overlooking three valleys.
  • Elevation: ~3,500 ft above sea level.
  • Antenna configuration: Two stacked vertical VHF antennas for even coverage, plus a UHF link dish aimed east.
  • Backup power: Absorbed glass mat (AGM) batteries sized for roughly 18 hours at standard load.
  • Notes: Easy road access most of the year; snow occasionally restricts winter visits.

Pine Summit Site

  • Location type: Shared with a seasonal fire lookout.
  • Elevation: ~6,200 ft, highest point in the system.
  • Antenna configuration: Tall VHF collinear providing very wide area coverage; 900 MHz microwave dish ties into the regional hub.
  • Backup power: Diesel generator with automatic start; seasonal fueling coordinated with fire service.
  • Notes: Harsh winters and ice loading make this site the most demanding.

River Bend Site

  • Location type: Small shelter on bluff above floodplain.
  • Elevation: ~450 ft.
  • Antenna configuration: Four-bay folded dipole array to spread signal horizontally across towns and highways.
  • Backup power: Deep-cycle AGM battery bank with ~10-hour reserve.
  • Notes: Humidity and flooding risk require frequent inspection of grounding and shelter integrity.

East Mesa Site

  • Location type: Telecom compound in desert plateau.
  • Elevation: ~2,800 ft.
  • Antenna configuration: Omni-directional fiberglass VHF whip for local coverage, plus a UHF yagi aimed west.
  • Backup power: Shared propane generator with automatic failover.
  • Notes: Reliable access roads, but desert heat challenges cooling fans.

Each site brings unique geography, weather, and infrastructure considerations. Together, they form a patchwork quilt of coverage.

Preventive Maintenance Calendar

Preventive maintenance ensures we fix problems before they break communications. The team follows a rolling seasonal plan:

  • January–March – Battery inspections and load testing, tightening cable lugs, verifying charger voltages, checking ventilation in shelters.
  • April–June – Antenna sweeps using network analyzers, checking coax for water intrusion, clearing vegetation around guy anchors and propane tanks.
  • July–September – Generator service: oil changes, filter swaps, test runs under load. Calibration of telemetry modules. Lightning protection inspection before storm season.
  • October–December – Software updates for controllers, rechecking duplexer tuning, grounding system checks, cleaning shelters before winter closures.

Every site receives a minimum annual in-person inspection; some receive multiple depending on accessibility and reports.

Recent Work Log

  • 2025-07-12: North Ridge controller firmware upgraded. Impact: Fixed occasional lockups, improved timeout recovery.
  • 2025-06-29: East Mesa UHF link radio replaced. Impact: Restored full path to River Bend.
  • 2025-05-18: Pine Summit generator air intake cleaned and screened. Impact: Improved reliability during dust storms and cold starts.
  • 2025-05-02: River Bend coax connectors re-terminated. Impact: Eliminated intermittent static bursts on weak signals.
  • 2025-04-14: Telemetry module at East Mesa recalibrated. Impact: Restored accurate battery voltage reporting.

Known Issues & Planned Upgrades

  • North Ridge: Batteries nearing end-of-life; replacements scheduled for Fall 2025.
  • Pine Summit: Link radio dish likely shifted during storms; alignment verification planned for September.
  • River Bend: Shelter roof patched but still leaks during heavy rain; long-term repair required.
  • East Mesa: Voltage telemetry shows erratic readings; swap-out planned on next service run.

Planned upgrades:

  • Deploy new digital-capable controllers across all sites by 2026 to allow cross-mode linking.
  • Expand solar panels at Pine Summit for cleaner, quieter backup power.
  • Implement centralized monitoring dashboard so all telemetry feeds are visible to members in real time.

How Members Can Help

The repeater system is community-owned and volunteer-driven. Here are ways members can contribute:

  • Skills needed:
    • RF troubleshooting and test equipment operation.
    • Generator and small engine maintenance.
    • Electrical wiring and grounding practices.
    • Data networking for controller programming.
    • Documentation and log-keeping.
  • Parts & supplies:
    • Coax connectors and jumpers.
    • Weatherproof tape and sealant.
    • Spare rack fans and temperature sensors.
    • AGM or lithium batteries.
    • LED work lights and hand tools.
  • Etiquette for site trips:
    • Travel with at least one partner for safety.
    • Always notify the technical team before and after.
    • Do not disturb co-located equipment from other agencies.
    • Clean up after yourself; leave sites neater than found.
    • Follow all fire, RF safety, and protective gear guidelines.

Even if you are not technical, simply helping carry gear, document work, or bring food and water on long days makes a huge difference.

Safety Disclaimer

Working at repeater sites carries serious risks: RF exposure, electrical shock, generator exhaust, ladder and fall hazards, and wildlife encounters. Only trained members with prior authorization may perform on-site work. Always use personal protective equipment (PPE), follow lockout/tagout practices, and defer to the site lead. If you are unsure of a task, do not attempt it. Safety always comes first.

Signal / Reporting Checklist (text only)

When you observe repeater behavior, please include:

  • Date and time of your observation.
  • Your approximate location (town, road, or landmark).
  • Signal strength and audio quality (e.g., full quieting, noisy, distorted).
  • Whether the repeater ID or courtesy tone was heard.
  • Whether links were active, dropped, or delayed.
  • Any unusual noises, tones, or patterns.
  • Power status if known (utility, generator, battery).

Submitting clear reports helps pinpoint issues and prevents unnecessary trips.

Calls to Action

[Donate Parts or Funds] – Every coax connector, battery, or gallon of generator fuel helps. Contributions are always welcome.

[Report a Technical Issue] – Send signal reports, outages, or safety concerns to the technical team.

[Volunteer for a Work Day] – Join a scheduled trip, learn from experienced members, and help keep the system running.