Using the Least Repeaters to Connect Radios

The proper locations of repeaters are the precondition to the efficiency of very high frequency (VHF) radio signal transmission. Thinking about using the minimum number of repeaters to connect all radios in one area, we divided the whole process into three procedures: User-Repeater Connection, Repeater-Repeater Connection and Frequency Distribution. Each radio should have at least one repeater settled in its signal emission range that can recognize its frequency. Likewise, each repeater requires another repeater within its signal transmission range. When we have to reuse frequencies, the co-channel interference cannot be neglected. We developed a complete set of arithmetic to work it out, using the continuous tone-coded squelch system (CTCSS) in a novel way in order to increase the number of radios that one repeater can serve simultaneously. We also quantify the number for the specific cases studied, and discuss further areas for research.

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