70cm Frequency Coordination

LOS coverages of W6YRA, KI6MGN, and N6MQS to a 20ft receiver

W6YRA/R is under consideration for coordination with SCRRBA. There are two other repeaters that share the 448.540/443.540 frequency pair.

In an effort to reduce interference (historically we have conflicted with KI6MGN) we are undertaking a SPLAT! analysis of these three sites.

This is a work in progress!

An example execution of the code would be:

splat -t w6yra.qth -r ki6mgn.qth -f 448.54 -m 1.333 -H ki6mgn.png -gc 82.6617

• KI6MGN. Mt. Palomar. RBook

  • Location: 33.310017 -116.851060, 5513ft AMSL
    
  • Bearing from W6YRA: SE (119 degrees)
  • Antenna Height: unknown (guessing 118 ft AGL)
    
  • Radio Horizon: 112 miles
  • Estimated path loss to W6YRA: 180 dB
  • TX power: unknown (guessing 45W)
  • Coax/feed losses: unknown (guessing none)
  • ERP: unknown (guessing 45W)
  • Antenna: unknown (guessing SPLAT! default)

• N6MQS. Verdudo Peak. RBook

  • Location: 34.2172, -118.284, 3693ft AMSL
    
  • Bearing from W6YRA: NE (41 degrees)
  • Antenna Height unknown (guessing 118 ft AGL)
    
  • Radio Horizon: 86 miles
  • Estimated path loss to W6YRA: 126 dB
  • TX power: unknown (guessing 45W)
  • Coax/feed losses: unknown (guessing none)
  • ERP: unknown (guessing 45W)
  • Antenna: unknown (guessing SPLAT! default)

For completeness, here are our own specifications in the same format:

• W6YRA. Westwood. RBook

  • Location: 33.311389 -116.860556, elevation 526 ft AMSL
    
  • Antenna height: 118ft AGL
  • Radio Horizon: 39 miles
  • Antenna bearing: SE (135 degrees)
  • TX power: 30 W
  • Coax/feed losses: 75ft LMR-400, SWR 2:1
  • ERP: 16.385W
  • Antenna: SPLAT! default