Architecture

System Architecture

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

The repeater system consists of one exterior mounted antenna and 50′ of feed line from the antenna on the roof to the radio repeater system in the top floor utility area. The radio repeater system consists of a duplexer which separates a single antenna feed line into a transmitter and receiver feed line. The duplexer is compact and located next to the radio repeater which is both a transmitter and receiver in one unit. The repeater also has an external gel-cell sealed battery as a back-up should the main power supply fail. The radio repeater requires one standard 110 volt outlet and consumes 2.4 Amps at 120 volts when transmitting and 0.12 Amps on standby. The radio repeater monitors the battery and keeps it charged as required.

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 35 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.