Equipment
The 442.15 system consists
of two repeaters. The UHF system is based around a Yaesu Vertex-5000
commercial repeater. It is running 25 watts out -through a pair
of Wacom BpBr -90Db duplexers with 74 feet of LMR-600 to a new
Diamond X700HNA +13DBD Omni directional antenna at 750" MSL.
It is located at the University of Texas at Austin. The system
also uses a Phelps-Dodge pre-selector cavity and HP GaAs FET preamplifier. This
system is fully battery backed-up with a 100AH deep-cycle cell on float charge.
The repeater's technical operating
characteristics are constantly monitored and optimized. It is operating at the
UHF noise floor and its TX power is exactly matched to the RX sensitivity.
Several custom modifications
have been made on the repeater to improve audio characteristics
and overall operation.
All current upgrades have been
completed as of June 1st, 2000.
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