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Charos · 04-18-07, 06:31 PM

http://jproc.ca/sari/sariff.html

"The earliest American IFF system was the Naval Research Laboratory (NRL) Model XAE of 1937. It was a shipboard Yagi antenna mounted on a rifle stock that could be pointed at an unknown aircraft.
The pilot would turn on his omnidirectional identification beacon and the ship would transmit back an acknowledgement that flashed a light on the aircraft, visible from the ship. The system worked on a frequency of 500 Mcs.
This air to ship system was tested in 1938 and operational use began in 1939."

04-18-07, 06:31 PM	#5
Charos Helmsman Join Date: Jan 2005 Location: Sydney, Australia Posts: 109 Downloads: 31 Uploads: 0	http://jproc.ca/sari/sariff.html "The earliest American IFF system was the Naval Research Laboratory (NRL) Model XAE of 1937. It was a shipboard Yagi antenna mounted on a rifle stock that could be pointed at an unknown aircraft. The pilot would turn on his omnidirectional identification beacon and the ship would transmit back an acknowledgement that flashed a light on the aircraft, visible from the ship. The system worked on a frequency of 500 Mcs. This air to ship system was tested in 1938 and operational use began in 1939."