Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-04-27
1979-03-20
Griffin, Robert L.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343177, H04B 138
Patent
active
041456564
ABSTRACT:
A transceiver receives electronic input signals comprised of a plurality of frequency bands lying within a plurality of non-overlapping frequency channels. A mixer frequency shifts a selected band to a predetermined center frequency in response to a first clocking signal of a first selectable frequency. A charge transfer device filter is coupled to the mixer output to filter the band of the predetermined center frequency in response to a second selectable frequency clocking signal. The clocking signals are generated by clocking means which receive digital microcommands identifying the selectable frequencies. Signal level measuring means are coupled to the output of the charge transfer device filter and generate digital level signals indicating the signal level present in the filtered band. Microprocessor means are coupled to send microcommands to the clocking means for sequentially filtering various channels from the plurality, and for monitoring the resulting digital level signals.
REFERENCES:
patent: 3535636 (1970-10-01), Muilwijk
patent: 3588701 (1971-06-01), Kahn
patent: 3641434 (1972-02-01), Yates
patent: 3809923 (1974-05-01), Esser
patent: 3835384 (1974-09-01), Liff
patent: 3940702 (1976-02-01), Yoshimura
patent: 3953745 (1976-04-01), Bailey
patent: 3978416 (1976-08-01), Sutphin
patent: 3983484 (1976-09-01), Hodama
patent: 4027242 (1977-05-01), Yamanaka
patent: 4041395 (1977-08-01), Hill
patent: 4069454 (1978-01-01), Winkelmann
Caudel Edward R.
Cochran Michael J.
Merryman Jerry D.
Comfort James T.
Griffin Robert L.
Masinick Michael A.
Sadacca Stephen S.
Sharp Melvin
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