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(2) Shared FRS and GMRS simplex; GMRS repeater output. (3) GMRS repeater input. The output frequency of this repeater input is the input frequency minus 5 MHz. (4) FRS transmissions are limited to bandwidth of 11 kHz with a transmitter deviation of +/- 2.5 kHz. Channels are on 12.5 kHz centers. (5) GMRS transmissions may have a bandwidth of 16 ...
467.5500 MHz – US GMRS Repeater Ch 15/23 Input; 467.5625 MHz – US FRS Channel 8; 467.5750 MHz – US GMRS Repeater Ch 16/24 Input; 467.5875 MHz – US FRS Channel 9; 467.6000 MHz – US GMRS Repeater Ch 17/25 Input; 467.6125 MHz – US FRS Channel 10; 467.6250 MHz – US GMRS Repeater Ch 18/26 Input; 467.6375 MHz – US FRS Channel 11
As of 2016, only low-power (2 W ERP), half duplex GMRS operation is permitted, but a license is not required. [6] Repeater and high-power operations are not permitted. This allows the use of dual-mode FRS/GMRS walkie-talkies, but precludes the use of higher-powered GMRS devices designed for vehicle and base-station purposes..
In same-band repeaters, isolation between transmitter and receiver can be created by using a single antenna and a device called a duplexer. The device is a tuned filter connected to the antenna. In this example, consider a type of device called a band-pass duplexer. It allows, or passes, a band, (or a narrow range,) of frequencies.
The duplexer is a device which prevents the repeater's high-power transmitter (on the output frequency) from drowning out the users' signal on the repeater receiver (on the input frequency). A diplexer allows two transmitters on different frequencies to use one antenna, and is common in installations where one repeater on 2 m and a second on ...
The control channels use signalling at 1,200 bits per second with fast frequency shift keying (FFSK) subcarrier modulation. It is designed for use by two-frequency half duplex mobile radio units and a full duplex TSC.
Branding Callsign Ch. # Power (kW) Station Type Location (Transmitter site) RPTV Manila DZKB-TV: 9 50 kW Originating RPN South Tower, Panay Avenue, Brgy.
Sometimes a transmission range of over 100 kilometres (60 miles) can be achieved through the use of a repeater. Repeaters are on channels 1–8 and 41–48 and the duplex button should be pressed to access the repeater. [5] All repeaters can be used by anyone, except for channel 5 repeaters, which are for emergencies only.