Automatic transponder

Details Automatic transponder Automatic transponder

1975-03-27

1977-08-16

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 740

Patent

active

040429261

ABSTRACT:
A method and apparatus for the automatic, remote measurement of the internal delay time of a transponder at the time of operation is provided. A small portion of the transmitted signal of the transponder is converted to the receive signal frequency of the transponder and supplied to the input of the transponder. The elapsed time between the receive signal locally generated and the receive signal causing the transmission of the transmitted signal is measured, said time being representative of or equal to the internal delay time of the transponder at the time of operation.

REFERENCES:
patent: 2604622 (1952-07-01), Hasbrook
patent: 3728728 (1973-04-01), Vogel et al.
patent: 3803607 (1974-04-01), Robinson
patent: 3919708 (1975-11-01), Pudsey

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