A repeater re-transmits (“repeats”) a 2-way radio transmission, typically at a much higher power and through an elevated antenna. This allows anyone who can reach the repeater with their radio to talk to anyone else who can also reach the repeater, even if the two radios are too far apart to communicate with each other directly. It also enables 2-way radios to communicate around or through obstacles such as terrain, infrastructure and foliage that may block point-to-point signals as depicted above.
Using a repeater requires a 2-way radio that is “repeater-capable.” This means that the radio operates with “split frequencies” (offsets) on a particular channel; one frequency that is transmitted to the repeater, and a different frequency that is received from the repeater. Many repeaters, including GENOAK’s, also use sub-audible tones and/or digital codes to filter out unwanted transmissions.
To work with the GENOAK repeater, your 2-way GMRS repeater-capable radio needs to be properly configured for repeater Channel 17R (462/467.600 MHz). Contact us for the GENOAK-specific tones/codes for your radio.
For direct (“simplex”) transmissions or in the event that the GENOAK repeater is not available, radio communications may take place on GMRS Channel 18 (462.625 MHz) or any other channel available.
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Oakland GMRS Repeater
Use of the Oakland 600 GMRS repeater is provided to GENOAK by the Northern California GMRS Users Group (NCGUG). This repeater was installed in 2001 and is equipped with a backup battery system that provides three to four days of operation during loss of utility power. Generator backup is also available for longer power outages. Repeater transmit power is reduced during backup battery operation but coverage of Oakland and surrounding areas is still enabled.
The repeater covers Oakland, Alameda, Berkeley, San Francisco and most Bay Area cities between Fremont north to Richmond. It is located at 1500 ft. elevation in the Oakland Hills, about 1 mile southeast of the Caldecott Tunnel and near the intersection of Skyline Blvd. and Grizzly Peak Blvd. For more information, refer to the GMRS Repeater Directory.