commercial transport aircraft were equipped with "long wire" antennas whose high-speed capabilities were unacceptable, though used, on the early jets. These antennas were designed to communicate on high frequency ("HF"). A band of frequencies in the range of 2 MHz - 30 MHz designated by inter...
The theory proposed by aerospace engineer Richard Godfrey is to use logs of sent and received WSPR transmissions that may have intersected the potential flight path of MH370, and to look for potential reflections or 'scatter' in the signal from the metal aircraft hull. From the reflections an ...
The results show good reception across the 20m, 80m, 40m amateur radio bands, as well as on HF ATC aircraft communications, US coast guard weather information broadcasts and the AM broadcast band. I made an HF Dipole for free! Reception was good on my AirSpy HF+ Discovery SDR!
(VHF) radars operating at 14 MHz and 30–35 MHz were developed at the University of Kansas to sound temperate ice and outlet glaciers. We have deployed these radars on a small unmanned aircraft system (UAS) and a DHC-6 Twin Otter. For both installations, the system utilized a dipole ...
aircraft is equipped with HF Automatic Link Establishment, and is active on the ham radio ALE channels during the flight. Ham operators worldwide can connect directly with Brian WB6RQN/AM Air Mobile on High Frequency SSB, ALE and AMD text messaging during the flight. The 125 Watt radio ...
To assist with the search for a useable frequency, each HF=Datalink ground station broadcasts system management uplink packets ('squitters') every 32 seconds on 3 or more active frequencies. Aircraft can measure the quality of each channel and use this info to select and automatically tune ...
aircraft is equipped with HF Automatic Link Establishment, and is active on the ham radio ALE channels during the flight. Ham operators worldwide can connect directly with Brian WB6RQN/AM Air Mobile on High Frequency SSB, ALE and AMD text messaging during the flight. The 125 Watt radio ...
MWARA frequencies- Aircraft use these stations to communicate over water when out of VHF radio range. VOLMETAeronautical stations broadcasting weather worldwide Digital and Other Modes HFDL, otherwise known as High Frequency Data Link, or HF ACARS, is now used extensively by many commercial airlines...
Radio logs documenting HF air to ground radio transmissions between the RFC and its aircraft are examined for frequency usage. A wide range frequencies is necessary to maintain reliable communications. Certain frequencies are shown to be more useful than others at certain ranges and times of day. ...
Knowledge of the specific radio equipment being used, propagation, antennas, and so forth is still essential to use ALE effectively. b. ALE will not improve propagation. If poor propagating frequencies are used, ALE will not make them work better. ALE only works as well as the frequencies ...