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Goliath transmitter was a very low frequency (VLF) transmitter for communicating with submarines, built by Nazi Germany's Kriegsmarine navy near Kalbe an der Milde in Saxony-Anhalt, Germany, which was in service from 1943 to 1945.
A beam waveguide antenna is a type of complicated Cassegrain antenna with a long radio wave path to allow the feed electronics to be located at ground level. It is used in very large steerable radio telescopes and satellite ground antennas, where the feed electronics are too complicated and bulky, or requires too much maintenance and alterations, to locate on the dish; for example those using ...
It is a 30 nmi (56 km) asr coverage and 20 nmi (37 km) PAR coverage. The system can operate in three different modes to include ASR, PAR and Combined mode. In ASR the azimuth antenna spins at 60 RPMs and used only to process targets typical to any ASR and also utilizes the AN/TPX-56 to process IFF targets.
The two measures EIRP and ERP are based on the two different standard antennas above: [1] [3] [2] [4] EIRP is defined as the RMS power input in watts required to a lossless isotropic antenna to give the same maximum power density far from the antenna as the actual transmitter.
The FRD-10 had only 2 antenna rings, 870 feet (270 m) and 780 feet (240 m) diameters. [2] The Navy system was vertically instead of horizontally polarized. [2] The FRD-10 was also said to be closer to omnidirectional than to the FLR-9 due to complications added by having three sets of reflectors and with FLR-9 array looking inward rather than ...
An antenna such as the one described above is usable for both local and medium-long-distance communication across a frequency range of about 1:6 . For example, an antenna for the lower portion of shortwave (say, 3–18 MHz) will be roughly 33 m (110 feet) long, with conductors spaced 1 m (3.3 feet). For the higher portion of shortwave (5–30 ...
EF Johnson Technologies, Inc. is a two-way radio manufacturer founded by its namesake, Edgar Frederick Johnson, in Waseca, Minnesota, United States in 1923. [1] Today it is a wholly owned subsidiary of JVCKenwood of Yokohama, Japan. EF Johnson Technologies offers a wide range of equipment for use by law enforcement, firefighters, EMS, and military.
The first EF-10B lost in Vietnam was to an SA-2 on 18 March 1966, while four more EF-10Bs were lost in Vietnam to accidents and unknown causes. [47] Their mission was gradually assumed by the more capable EA-6A "Electric Intruder", an Electronic Warfare/Electronic Countermeasures (EW/ECM) variant of the Grumman A-6 Intruder attack bomber. [ 48 ]