| Porcupine Dome Repeater
146.70- 103.5 Hz pl tone |
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| Short cut to:
| Repeater Page | | Repeater Map | | AARC main page | |
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| Porcupine Dome Repeater
146.70- 103.5 Hz pl tone |
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| Short cut to:
| Repeater Page | | Repeater Map | | AARC main page | |
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| Porcupine Dome (65N31.07', 145W31.34',
elevation 1498m)
Located about 6 miles WNW of MP 107 Steese Highway Installed January 22, 1997 by NL7WO and VY1CB repaired by WL7LP & AL7HT June 1999 repaired by AL7FQ, KL7EDK & NL7XH 2 April 2000 |
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| Testing done by KL0CK on 1/27/97 determined good signal at 12 mile summit and mile 104 Steese. Also could hit it with a handheld and rubber duck at mile 101. Reported scratchy at mile 57. Worked from Fairbanks by KL7B, AL7FQ and heard by KL7XO. | ||
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Left: Porcupine Dome. Taken about three miles to the east, May 1989
by KL7XO.
Right: Repeater installation at the crack of dawn. Repeater Construction photos are available (see Mt. Eldridge). |
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Left: VY1CB installing new repeater January 22, 1997
Right: NL7WO and VY1CB pose for a picture before dawn |
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Left: Russ Eley WL7LP (left) ,AL7HT Mark Richards (right) , and Wigi
Tozzi AL7IF (not shown), drove/biked/hiked to the Porcupine Dome Repeater
(below) and swapped out radio and solar regulator. The same failure we
had at Mt. Eldridge. It was a very long day for the trio.
The efforts paid off. The repeater works better than ever now and
we hope it will continue forever too
Right: AL7HT Mark Richards next to the Porcupine Repeater (June 1999 photos by WL7LP via AL7IF)
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Left: USAF communication shelter shares Porcupine Dome with our repeater
Right: BLM does too. (June 1999 photos by WL7LP via AL7IF)
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Left USAF shelter again.
Right: rear of repeater (June 1999 photos by WL7LP via AL7IF) |
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Left: AL7FQ at the Porkie repeater
Right: KL7EDK there too. (April 2, 2000) |
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Left: BLM site in foreground USAF site in middle of photo (April
2,2000)
Right: Left intentionally blank |
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Above: Path profile, Porcupine Dome to Ester Dome. (already loaded) |
| Left: Map showing path between Ester Dome and Porcupine Dome
BIG FILE: 527x1637 pixels, 335K bytes not yet loaded. |
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| Ester Dome to Porcupine Dome | Porcupine Dome to Ester Dome | |||
| Elevation antenna A (m) | 720 | Ester Dome | 720 | Ester Dome |
| Elevation antenna B (m) | 1463 | Porcupine Dome | 1463 | Porcupine Dome |
| Elevation obstruction (m) | 922 | Twin Butte | 922 | Twin Butte |
| Distance A to B (km) | 134 | Ester Dome to Porcupine Dome | 134 | Porcupine Dome to Ester Dome |
| Distance A to obstruction (km) | 64 | Ester Dome to Twin Butte | 70 | Porcupine Dome to Twin Butte |
| frequency (MHz) | 444.8 | 449.8 | ||
| Theta (rad) | 0.0033 | 0.0033 | ||
| V | 1.04 | 1.05 | ||
| defraction loss (dB) | 14.31 | Twin Butte | 14.34 | Twin Butte |
| free space loss (dB) | 127.97 | Ester Dome to Porcupine Dome | 128.07 | Ester Dome to Porcupine Dome |
| TOTAL PATH LOSS (dB) | 142.28 | defraction + free space | 142.41 | defraction + free space |
Short cut to: | Repeater Page | Repeater Map | AARC main page |
| 445 MHz Link - Fade Margin Calculation | |||||
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| Ester Dome to Porcupine Dome | Porcupine Dome to Ester Dome | ||||
| Tx power (watts) | 2.00 | Ester Dome | 5.00 | Porcupine Dome | |
| Tx power (dBm) | 33.01 | Ester Dome | 36.99 | Porcupine Dome | |
| tx coax (dB) | -2.50 | 50'*5dB/100' | -1.50 | 30'*5dB/100' | |
| tx ant gain (dBi) | 12.0 | Diamond 17' | 7.00 | Diamond X50A | |
| rx ant gain (dBi) | 7.00 | Diamond X50A | 12.0 | Diamond 17' | |
| rx coax (dB) | -1.50 | 30'*5dB/100' | -2.50 | 50'*5dB/100' | |
| system gain (dBm) | 48.01 | 51.99 | |||
| TOTAL PATH LOSS (dB) | 142.28 | from above | 142.41 | from above | |
| rx sens (dBm) | -110.00 | (20dB S+N/N) | -110.00 | (20dB S+N/N) | |
| FADE MARGIN (dB) | 15.73 | rx sens + system gain - path loss
10dB for 90% reliability 20dB for 99% reliability 30dB for 99.9% reliability 40dB for 99.99% reliability |
19.58 | ||
Short cut to: | Repeater Page | Repeater Map | AARC main page |
this page revised 13 May 2000 by:
Web Site Provided by: AL7FG
