| Mt. Fairplay Repeater | |
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| Short cut to:
| Repeater Page | | Repeater Map | | AARC main page | |
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| Mt. Fairplay Repeater | |
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| Short cut to:
| Repeater Page | | Repeater Map | | AARC main page | |
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installed Feb 5, 1997 by NL7XH freq change Oct 24, 1998 by NL7XH & WL7VO |
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Left:. Dick, WL7VO at the Fairplay Repeater, Oct 24, 1998
Right: Rim ice on the Mt. Fairplay repeater site photos by NL7XH |
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Left:. Broken Diamond X3200 at Fairplay
Right: Replacement 4 element cushcraft for 220 MHz link to Dot Lake |
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Left:. Replacement Diamond X50A for 440MHz repeater
Right: KL7XO repeater in the rack, click it for enlarged photo and diagram |
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Left:. Showing the old chassis with the Kenwood TH79 crossband handheld
Right: The backside of the Fairplay repeater. Click for enlarged photo and diagram |
| 224 MHz Link - Path Profile | |
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Above: Path profile, Mt. Fairplay to Dot Lake. (already loaded) |
| Left: Map showing path between Mt. Fairplay and Dot Lake
BIG FILE: 527x1637 pixels, 335K bytes not yet loaded. |
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| 224 MHz Link - Path Loss Calculation | ||||
|---|---|---|---|---|
| Fairplay to Dot Lake | Dot Lake to Fairplay | |||
| Elevation antenna A (m) | 671 | Dot Lake | 671 | Dot Lake |
| Elevation antenna B (m) | 1688 | Fairplay | 1688 | Fairplay |
| Elevation obstruction (m) | 975 | Triden | 975 | Triden |
| Distance A to B (km) | 91 | Dot Lake to Fairplay | 91 | Dot Lake to Fairplay |
| Distance A to obstruction (km) | 23 | Dot Lake to Triden | 68 | Triden to Fairplay |
| frequency (MHz) | 224 | 224 | ||
| Theta (rad) | 0.0081 | 0.0081 | ||
| V | 1.30 | 1.30 | ||
| defraction loss (dB) | 15.74 | Triden | 15.74 | Triden |
| free space loss (dB) | 118.65 | Dot Lk to Fairplay | 118.65 | Fairplay to Dot Lk |
| TOTAL PATH LOSS (dB) | 134.40 | defraction + free space | 134.40 | defraction + free space |
| 224 MHz Link - Fade Margin Calculation | |||||
|---|---|---|---|---|---|
| Dot Lake to Mt. Fairplay | Mt. Fairplay to Dot Lake | ||||
| Tx power (watts) | 20.00 | Dot Lake | 25.00 | Fairplay | |
| Tx power (dBm) | 43.01 | Dot Lake | 43.98 | Mt. Fairplay | |
| tx coax (dB) | -2.80 | 80'*3.5dB/100' | -2.80 | 80'*3.5dB/100' | |
| tx ant gain (dBi) | 7.20 | Cushcraft 224WB | 7.20 | Cushcraft 224WB | |
| rx ant gain (dBi) | 7.20 | Cushcraft 224WB | 7.20 | Cushcraft 224WB | |
| rx coax (dB) | -2.80 | 80'*3.5dB/100' | -2.80 | 80'*3.5dB/100' | |
| system gain (dBm) | 52.81 | 52.78 | |||
| TOTAL PATH LOSS (dB) | 134.40 | from above | 134.40 | from above | |
| rx sens (dBm) | -110.00 | (20dB S+N/N) | -110.00 | (20dB S+N/N) | |
| FADE MARGIN (dB) | 27.41 | rx sens + system gain - path loss
10dB for 90% reliablity 20dB for 99% reliablity 30dB for 99.9% reliablity 40dB for 99.99% reliablity |
28.38 | ||