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A type of system known as a simplex repeater uses a single transceiver and a short-duration voice recorder, which records whatever the receiver picks up for a set length of time (usually 30 seconds or less), then plays back the recording over the transmitter on the same frequency. A common name is a "parrot" repeater.
Simplex's time-division began to lose market share, but their newly founded fire alarm division significantly prospered. In 1970, Simplex introduced conventional control panels . In 1979, Simplex introduced the industry's first networked multiplex building control system that was capable of handling fire alarm, security, HVAC, synchronized time ...
Coded panels were the earliest type of central fire alarm control, and were made during the 1800s to the 1970s. A coded panel is similar in many ways to a modern conventional panel (described below), except each zone was connected to its own code wheel, which, depending on the way the panel was set up, would either do sets of four rounds of code until the initiating pull station was reset ...
From 29.000 MHz to 29.700, The FM sub-band is usually channelized into repeater and simplex frequencies. The channels are commonly grouped into repeater inputs, simplex, and repeater output frequencies. Repeater input frequencies: 29.510, 29.520, 29.530, 29.540, 29.550, 29.560, 29.570, 29.580 and 29.590 MHz.
A short-range simplex radio communications service for recreational use is from 477.5250 to 477.9875 MHz FM mode with 38 channels and a power output of 500 mW. A CB radio or Personal Radio Service Device under Class Assignment does not need an individual license to operate in Malaysia if it adheres to the rules of the Warta Kerajaan Malaysia [ 33 ]
In essence, a trunked radio system is a packet switching computer network. Users' radios send data packets to a computer, operating on a dedicated frequency — called a control channel — to request communication on a specific talkgroup.
Repeater Channel: 12.5 kHz Channel 2: 476.4500: Repeater Channel: 12.5 kHz Channel 3: 476.4750: Repeater Channel: 12.5 kHz Channel 4: 476.5000: Repeater Channel: 12.5 kHz Channel 5: 476.5250: Emergency Repeater Output (not an emergency channel in New Zealand) 12.5 kHz Channel 6: 476.5500: Repeater Channel: 12.5 kHz Channel 7: 476.5750: Repeater ...
A 20/28 hp plate-frame Simplex built in 1941, running at the Moseley Railway Trust Simplex 40 hp armoured 600 mm (1 ft 11 + 5 ⁄ 8 in) gauge, built for the British Army for World War I Two models of Simplex locomotive at Alan Keef's works, 1999 Red Rum at Leighton Buzzard Narrow Gauge Railway