In early summer 1940, squadron aircraft were fitted with VHF radiotelephone equipment and Mark III Airborne interception ( AI ) radar.
42.
These codes are used in radiotelephone conversations with air traffic control as unambiguous shorthand, where safety and efficiency are of vital importance.
43.
In addition to Morse code, this development work included radiotelephone transmissions, using the recently developed capabilities of vacuum-tube transmitters.
44.
These signals are broadcast on marine longwave frequencies, which could be received on existing radiotelephones and fed into suitably equipped GPS receivers.
45.
This was also true for other experimenters doing arc-transmitter radiotelephone research during this period, including Lee DeForest and Charles Herrold.
46.
In 1929, a special license endorsement for " unlimited radiotelephone privileges " became available in return for passing an examination on radiotelephone subjects.
47.
In 1929, a special license endorsement for " unlimited radiotelephone privileges " became available in return for passing an examination on radiotelephone subjects.
48.
The FCC requires that all new VHF and MF / HF maritime radiotelephones type accepted after June 1999 have at least a basic DSC capability.
49.
Finally there is a restricted radiotelephone operator's certificate, which is similar to the Short Range Certificate but limited VHR DSC radio operation.
50.
On July 16, 1920 the world's first commercial wireless radiotelephone toll circuit was opened to the public between San Pedro and Avalon.
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