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147.180 Technical Info

Madera County Amateur Radio Club Deadwood
2-Meter Repeater Technical Information

CALL: W6WGZ/R (Madera club call)

LOCATION: Deadwood Peak. Two miles east of Oakhurst, north of highway 41. 38 miles north of Fresno. Lat 37 17 55 Long 119 41 04

ELEVATION: 4540 ft.

REPEATER NORMAL MODE: Carrier (any on frequency signal will activate the repeater transmitter).

RECEIVER: 147.780 Mhz 0.2 microvolts sensitivity at duplexer terminal. +- 5 Khz audio deviation. +- 2 Khz transmit frequency tolerance.

TRANSMITTER: 147.180 Mhz +- 2 ppm Output 15 watts to the antenna (after duplexer) +- 5 Khz peak audio deviation. Transmitter does not encode CTCSS tone.

ANTENNA: Omnidirectional 5+ dbd gain. ERP about 45 watts. Antenna base is 40 ft above ground. It is a commercial antenna (Celwave PD 220) that consists of eight colinear dipoles mounted in a 20 ft. long fiberglass tube.

FEED CABLE: 75 ft. 1/2" copper hardline.

POWER: Radio operates from a nominal 12 volt (13.6) battery, 250 amp hours maintained by a 25 amp regulated charger. This battery is shared with another repeater. Receive current drain 340 ma Transmit current drain 4.5 amp

IDENTIFICATION: Repeater signs W6WGZ/R every eight minutes and two minutes after the last transmission of a QSO. It waits until the end of a transmission before identifying unless the transmission lasts longer than two minutes. If the repeater is in TONE MODE a short tone burst follows call identification.

TIME OUT: The timer allows five minutes continuous transmission without a break. It then turns the transmitter off without warning. Reset (no received signal) must be at least two seconds.

ALARMS: There are four station alarms. Each is a loud tone followed by a group of five shorter tones followed by a group of two tones, then a group of one, two, three or four tones. This whole sequence is repeated several times.

Third group

One tone: A.C. power fail (operating on battery)
Two tones: Vault temperature out of limit, below 35' or above 95'
Three tones: Battery under voltage, 11.4 volts
Four tones: Vault door open. There is no external defeat on the door alarm

This repeater is a member of the Northern Amateur Relay Council of California and the frequencies have been coordinated and sanctioned by that council.