Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-07-03
1979-09-25
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
307234, 328119, G01S 956, H03K 1300
Patent
active
041692640
ABSTRACT:
An air traffic control transponder includes a synchronous digital delay line decoder for providing mode selection signals in response to pulse space coded transmissions from the ground station. The decoder comprises a shift register delay line having a plurality of delay taps along which a first received pulse is shifted. A continuously running high frequency clock pulse generator via a frequency divider provides the shifting clock to the delay line. The first received pulse synchronizes the shifting clock via the frequency divider. A plurality of monostable multivibrators connected to selected taps of the delay line provide pulse detection windows in response to the first received pulse being shifted through the stages of the shift register to which the window generating monostable multivibrators are connected. The outputs from the window generators are applied as inputs to respective pulse coincidence detection devices, the second inputs thereof being connected to receive the incoming pulses. The coded pulse spacing of the received pulses is determined by coincidence between the window pulses generated in response to the delayed first pulse and the receipt of the second pulse. The decoder is utilized in the air traffic control transponder to perform both the decoding function as well as to transmit appropriate data in accordance with the detected mode represented by the transmitted pulse spacing.
REFERENCES:
patent: 3579235 (1971-05-01), Straub et al.
patent: 3913100 (1975-10-01), Janex
patent: 3940764 (1976-02-01), Beeswing
patent: 4135187 (1979-01-01), Borota, Jr.
Cooper Albert B.
Hubler Malcolm F.
Sperry Rand Corporation
Terry Howard P.
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