Below: 1283 repeater block diagram
Installed in Dec 2005
New packaging for new location on Mt Wilson, 24 watts out of duplexer, 0.8 db feedline loss (55 feet of 7/8), 1 db noise figure, 8 cavity duplexer
DC switcher power supply
Up/down converters and local oscillators
VHF to audio up/down converters
Original repeater configuration since 1992:
VHF-audio up & down converters, PL decoder.
VHF-1280 MHz up & down converters, crystal local oscillators, combline band pass filters & GaAs FET preamplifiers.
28 Watt final amplifier & driver.
7 cavity duplexer.
above, original compac duplexer, discarded when found ratones (rats) living in it.........yuk
complete assembly with early controller. Entire repeater uses only 5 rack units of height
rear view showing interconnects, PA and power supply
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