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The range of the unit varied with terrain; from a few hundred feet (about a hundred metres), to approximately one mile (1.5 km) over land, and 3 miles (5 km) over water. [5] Under the Army Nomenclature System, the BC-611 transceiver was the core component of the SCR-536 Signal Corps Radio set. The Signal Corps technical manual number was TM 11-235.
Motorola T5320 FRS handheld radio. The Family Radio Service (FRS) is an improved walkie-talkie radio system authorized in the United States since 1996. This personal radio service uses channelized frequencies around 462 and 467 MHz in the ultra high frequency (UHF) band.
Theoretically, the range between two hand-held units on flat ground would be about one or two miles (about 1.5–3 km). Mobile units might have a slightly farther range when mounted on a car roof. A GMRS repeater with an antenna mounted high above the surrounding terrain can extend the usable range to 20 miles or more (30+ km) depending on height.
Since 3 February 2004, the Infocomm Development Authority of Singapore (IDA) has allocated the 446.0–446.1 MHz frequency band for low-powered walkie-talkies on a non-interference, non-protected and shared-use basis.
In the absence of a network, mobiles/portables can use 'direct mode' whereby they share channels directly (walkie-talkie mode). Gateway mode - where a single mobile with connection to the network can act as a relay for other nearby mobiles that are out of range of the infrastructure.
Frequency range [1] 136–174 MHz 400–520 MHz: Frequency steps 2.5–50k Hz Transmitter power output: 5 W PEP: Waveforms (modulations) FM: modulation rate: Power input Receiver only 20 mA, Transmitter 1 A max. Operating voltage 6.5 – 9 V, Nominal voltage 7.2 V: Measurements and weight High 140 mm Width 70 mm Depth 30 mm Weight approx. 400 grams
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