Architecture

System Architecture

StJohn-Roof
Antenna is on the roof of St. John Hospital

The repeater system consists of two exterior mounted antennas.  The receive antenna is mounted half-way up the tower.  The transmit antenna is a sand-alone configuration on its own 10′ mast about 30 feet away from the tower.  Both antennas are currently fed by 9913 coax to the radio repeater system in the top floor utility area. The radio repeater system consists of a filtered receive line (the receive half of a duplexer) but no filter on the transmit line. The radio repeater is a Yaesu DR-2X C4FM and FM repeater in Automatic Mode Select.  This means that whatever mode the repeater hears, that’s the mode it will transmit.

Radios Supported

Radio operators inside St. John Hospital require only a small hand-held UHF transceiver on low power (.1 to 1 watt) and standard size small flexible antennas to access the repeater system. Their signals, relayed by the repeater can be heard and responded to by radio operators throughout the coverage area. The repeater operates at 50 watts which is ample power to provide full on-street communications throughout the coverage area. In-vehicle and in-home signal quality will vary by distance from the repeater, antenna used, materials around the distant party, and sensitivity of their receiver.  Signal strength should be adequate for most communications in the coverage area. Signal attenuation by industrial buildings will significantly degrade communications to hand-held radio operators in those facilities as distance increases from St. John Hospital. Operators in the Leavenworth VA Hospital and St Luke’s Cushing Hospital should have adequate signal throughout their facilities for hand-held radio use. Operators inside Munson Army Community Hospital will likely not be able to access the repeater except from upper floors on the south side of the building.