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This revised guide explores essential repeater concepts crucial for amateur radio technicians. It delves into output and input frequencies, the offset commonly used in 2 meters and 70 cm bands, and subaudible tones that minimize interference. Specific examples from repeaters near Greenfield, such as input/output frequencies for 2 meters and 70 cm repeaters, are discussed. The guide also includes line-of-sight considerations and equipment configurations for various repeater sites in Franklin County, providing a comprehensive understanding of real-world applications.
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FCARC Technician Class January 2012 Session 1, Part 2: Repeaters Revised April 2013
Repeater Concepts: • Output frequency: a user listens on this frequency • Input frequency: a user transmits on this • Offset: usually +/- 600 KHz on 2 meters, +/- 5 MHz on 70 cm • Subaudible tone: used to prevent repeating interfering signals
Franklin County Amateur Radio Club Repeaters 2 meters (Frizzell Hill, Leyden) input frequency: 146.385 MHz output frequency: 146.985 MHz 70 cm (Rocky Mountain, Greenfield) input frequency: 443.875 MHz output frequency: 448.875 MHz CTCSS tone: 136.5 Hz (both repeaters)
N1AW N1AW (Leyden) line of sight
KB1BSS repeater (Leyden) line of sight
KB1BSS repeater site, Leyden Mt Monadnock on the horizon
KB1BSS 2 meter antenna on FM station tower
KB1BSS 440 MHz repeater antennas on Rocky Mountain (Poets Seat) above Greenfield