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The audio quality in the airband is limited by the RF bandwidth used. In the newer channel spacing scheme, the largest bandwidth of an airband channel is limited to 8.33 kHz, so the highest possible audio frequency is 4.166 kHz. [19] In the 25 kHz channel spacing scheme, an upper audio frequency of 12.5 kHz would be theoretically possible. [19]
The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress.The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, [1] or VHF Guard, [1] and 243.0 MHz—the second harmonic of VHF guard—for military ...
FREQUENCY (MHz) A: 0 – 250 I: 100 – 150 Band I 47 – 68 MHz (TV) Band II 87.5 – 108 MHz (FM) G: ... US- MILITARY / SACLANT [citation needed] N: 100 000 – 200 ...
The primary HFGCS voice frequencies are 4724.0 kHz, 8992.0 kHz, 11175.0 kHz, and 15016.0 kHz. In addition to the HFGCS, U.S. aircraft frequently use Military Auxiliary Radio System (MARS) HF stations (13927.0 kHz) and Canadian Forces HF stations (11232.0 kHz) to relay messages. Various other discrete frequencies are available, and used, as part ...
The NATO N band is the designation given to the radio frequencies from 100 to 200 GHz (equivalent to wavelengths between 3 mm and 1.5 mm) used by US armed forces and SACLANT in ITU Region 2. The NATO N band is also a subset of the EHF band as defined by the ITU .
The NATO J band is the designation given to the radio frequencies from 10 to 20 GHz (equivalent to wavelengths between 3 and 1.5 cm). Since 1992 frequency allocations, allotment and assignments are in line to NATO Joint Civil/Military Frequency Agreement (NJFA). [1]
This page was last edited on 3 December 2024, at 07:16 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
The military use of the frequency spectrum is based on the provisions of the ITU Radio Regulations and the ITU Constitution (Article 48 and RR N.342).; A supplement to the NJFA for states of emergency, and times of crisis and war, on the use of radio spectrum for military purposes required by NATO forces or in support of NATO, caters for additional spectrum.