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The first handheld walkie-talkie was the AM SCR-536 transceiver from 1941, also made by Motorola, named the Handie-Talkie (HT). [9] The terms are often confused today, but the original walkie-talkie referred to the back mounted model, while the handie-talkie was the device which could be held entirely in the hand.
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.
It was used for communication back to the regimental command post. Range 25 km AM voice to 140 km CW using the nine-metre antenna, the station had to be stopped to use this antenna. FuG 9: A transceiver, operated in the 0.1 - 7.1 MHz (100 kHz - 7100 kHz) range. FuG 10: A medium-wave transceiver (receiver/transmitter) used in command tanks. It ...
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
Range of action: On rough terrain - up to 7–8 km. On urban conditions - 3–4 km. On slightly cross-country terrain outside of buildings - 10 km and more. Power source: two dry anode batteries BAS-80 with a total voltage of 160 V and two 2 NKN-10 nickel-cadmium batteries. The time of continuous operation from one set is 35–40 hours. [1]
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.