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The AN/PRC-77 entered service in 1968 during the Vietnam War as an upgrade to the earlier AN/PRC-25.It differs from its predecessor mainly in that the PRC-77's final power amplifier stage is made with a transistor, eliminating the only vacuum tube in the PRC-25, as well as the DC-DC voltage converter used to create the high plate voltage for the tube from the 15 V battery.
The SCR-694 is a portable high frequency two way radio set that was used by the U.S. military during World War II.The SCR-694 provides transmission and reception of AM radiotelephony and MCW or CW radiotelegraphy within the frequency range of 3.800 to 6.500 MHz.
The AN/ART-13 operated in CW (code), MCW and AM (voice) modes and covered LF, MF and HF frequencies up to 18.1 MHz.It had ten autotuned VFO tuned channels that could be preset. . Post-war modifications by COMCO and other companies added crystal frequency control capability and were approved for use on civil airline
Pages in category "Military radio systems of the United States" The following 114 pages are in this category, out of 114 total.
At the time they were built, they were the tallest towers used for military purposes in the Western hemisphere. [1] The two masts are also the tallest towers used for long wave transmissions in the Western hemisphere. Since the collapse of Warsaw Radio Mast, they may be the world's tallest structures that are electrically insulated from the ground.
Kites built to raise signal flags and radio antennae, First Company, Signal Corps, National Guard of New York, 1907. The British Royal Navy experimented with kite raising antennae on HMS Good Hope in 1903, using a box kite designed by Samuel Franklin Cody. A 300-foot kite raised antenna increased their radio range from 60 or 70 miles to 110 ...
The USMC ordered 60,000 radios to be used until replaced by the more complex Joint Tactical Radio System (JTRS) cluster 5 spiral 2 radio in 2013. [2] However, JTRS was cancelled in October 2011, [3] and thus the PRC-153 continues to serve. The IISR is a Motorola XTS 2500i [4] with embedded encryption module to provide secure voice communications.
The Wireless Set No. 62 was a British Army HF band radio transceiver. Introduced by Pye during the later part of World War II as a light-weight and waterproof replacement for the Wireless Set No. 22. Although intended as an interim design, it remained in production until 1966. [1]