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Repeaters are found mainly in the VHF 6-meter (50–54 MHz), 2-meter (144–148 MHz), 1.25-meter band (1 1 ⁄ 4 meters) (220–225 MHz) and the UHF 70 centimeter (420–450 MHz) bands, but can be used on almost any frequency pair above 28 MHz. In some areas, 33 centimeters (902–928 MHz) and 23 centimeters (1.24–1.3 GHz) are also used for ...
Land mobile radio systems are widely used by the military. Separate bands in the radio spectrum are reserved for their use. This includes portions of the 30-50 MHz band, and the entire 100-100, 100-100.8, and 540-2400 MHz bands, plus shared use of the 170- 170 MHz band.
The MARS programs also include active duty, reserve, and National Guard units; and Navy, Marine Corps units. [1] MARS has a long history of providing worldwide auxiliary emergency communications during times of need. The combined two-service MARS programs (Army, and Air Force), volunteer force of over 3,000 dedicated and skilled amateur radio ...
RFinder's main service is the World Wide Repeater Directory (WWRD), which is a directory of amateur radio repeaters. RFinder is the official repeater directory of several amateur radio associations. RFinder has listings for several amateur radio modes , including FM , D-STAR , DMR , and ATV .
The 2-meter amateur radio band is a portion of the VHF radio spectrum that comprises frequencies stretching from 144 MHz to 148 MHz [1] in International Telecommunication Union region (ITU) Regions 2 (North and South America plus Hawaii) and 3 (Asia and Oceania) [2] [3] and from 144 MHz to 146 MHz in ITU Region 1 (Europe, Africa, and Russia).
Emblem of the AAFTC Radar school at Boca Raton AAF (1943–1947) The new base was opened on 1 June 1942. Flight operations from the airfield began during the summer. Boca Raton AAF was placed under the jurisdiction of the Army Air Forces Eastern Technical Training Command 3501st Base Unit (Technical School, Radar).
[4] Civil Air Patrol was created on December 1, 1941. [5] In Florida, the First Air Squadron was reorganized as a Civil Air Patrol unit. By early January 1942, Florida wing was organized into seven different operation groups, each with a commander and staff. [6]
A coverage map may be produced to indicate the area in which a certain signal strength is delivered. [1] Even if it is 100% accurate (which it never is), a major factor on whether a signal is receivable depends very much on whether the receiving apparatus is sensitive enough to use a signal of that level.