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Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra high frequency (UHF).
Code of Federal Regulations, Title 47, Part 15 is an oft-quoted part of Federal Communications Commission (FCC) rules and regulations regarding unlicensed transmissions. It is a part of Title 47 of the Code of Federal Regulations (CFR), and regulates everything from spurious emissions to unlicensed low-power broadcasting. Nearly every electronics device sold inside the United States radiates unintentional emissions, and must be reviewed to comply with Part 15 before it can be advertised or sold in the US market.
Communication with submarines is a field within military communications that presents technical challenges and requires specialized technology. Because radio waves do not travel well through good electrical conductors like salt water, submerged submarines are cut off from radio communication with their command authorities at ordinary radio frequencies. Submarines can surface and raise an antenna above the sea level, or float a tethered buoy carrying an antenna, then use ordinary radio transmissions; however, this makes them vulnerable to detection by anti-submarine warfare forces.
Duga was an over-the-horizon radar (OTH) system used in the Soviet Union as part of its early-warning radar network for missile defense. It operated from July 1976 to December 1989. Two operational duga radars were deployed, with one near Chernobyl and Chernihiv in the Ukrainian SSR, and the other in eastern Siberia.
Over-the-horizon radar (OTH), sometimes called beyond the horizon radar (BTH), is a type of radar system with the ability to detect targets at very long ranges, typically hundreds to thousands of kilometres, beyond the radar horizon, which is the distance limit for ordinary radar. Several OTH radar systems were deployed starting in the 1950s and 1960s as part of early warning radar systems, but airborne early warning systems have generally replaced these. OTH radars have recently been making a comeback, as the need for accurate long-range tracking becomes less important with the ending of the Cold War, and less-expensive ground-based radars are once again being considered for roles such as maritime reconnaissance and drug enforcement.
Type 517 radar is believed to be an A-band/VHF air search radar widely deployed on PLAN surface vessels with 4 antennas in two crossed-brace supported pairs, one above the other, mounted in pairs on each side of a single tubular support carried on the turning gear.
Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 3,000 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by another antenna connected to a radio receiver. Radio is widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing, and other applications.
The "Pegmantit 3" or P-3 was an early VHF radar developed and operated by the former Soviet Union.
The "Pegmantit 8" or P-8 was an early 2D VHF radar developed and operated by the former Soviet Union.
The "Pegmantit 10" or P-10 was an early 2D VHF radar developed and operated by the former Soviet Union.
The P-12 "Yenisei" was an early VHF radar developed and operated by the former Soviet Union.
The P-18 or 1RL131Terek is a 2D VHF radar developed and operated by the former Soviet Union.
The P-14 is a 2D VHF radar that was developed and operated by the Soviet Union.
The P-70 or "Lena-M" was a static 2D VHF radar developed and operated by the former Soviet Union.
The P-19"Danube"1RL134 is a 2D UHF radar developed and operated by the former Soviet Union. The radar was also known by the name "Renata" in Poland and "Dunai" in the former German Democratic Republic.
The Nizhny Novgorod Research Institute of Radio Engineering (NNIIRT) is a Russian electronics company specializing in the development and manufacturing of radar equipment. It is a subsidiary of the Almaz-Antey group.
Container (29B6) radar is the new generation of Russian over-the-horizon radar, providing long distance airspace monitoring and ballistic missile detection. The first radar, near Kovylkino, Mordovia, Russia, became operational in December 2013 and entered combat duty on 1 December, 2019. Another Container radar is planned to be deployed in Kaliningrad.
The NIIDAR company, the Scientific and Research Institute for Long-Distance Radio Communications is a Russian manufacturer of radar systems.
VNIIRT - All-Russian Scientific Research Institute of Radio Engineering is a Russian manufacturer of air surveillance radars. It is part of the Almaz-Antey holding.
The Nebo-SVU is a very high frequency multi-functional radar and first radar with an active electronically scanned array antenna operating in the metric wavelength. The radar was introduced in 2001 as a replacement for Nebo-SV. It can locate aircraft or other flying object with 0.1 m2 radar cross-section at 100 km (62 mi).
References
- ↑ "NNIIRT" . Retrieved 1 March 2016.
- ↑ "Soviet Radars".
- ↑ "NIIDAR" . Retrieved 1 March 2016.
- ↑ "Podsolnukh-E over-the-horizon surface-wave radar" . Retrieved 2 March 2016.
- ↑ "29B6 Konteyner Over The Horizon Radar".
- ↑ "Russia places latest Nebo-T radars on combat alert in Volga area and Urals".
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