Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-12-04
1982-08-03
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5W, G01S 728
Patent
active
043429980
ABSTRACT:
A radio frequency transmitter-receiver alternately transmits signal pulses of frequency F.sub.1 and receives return echo signals of frequency F.sub.1. The transmitter signal of frequency F.sub.1 is generated by mixing signals of frequencies F.sub.2 and F.sub.3. A signal of frequency F.sub.3 is generated by mixing signals of frequencies F.sub.4 and F.sub.5. The return signal of frequency F.sub.1 is mixed with frequency F.sub.2 which is continuously generated by the transmitter to produce a signal of intermediate frequency F.sub.3. Frequency F.sub.5 and therefore frequencies F.sub.3 and F.sub.1 are only generated during signal transmission and therefore do not interfere with the return signal of frequency F.sub.1 and the produced intermediate frequency F.sub.3.
REFERENCES:
patent: 4238796 (1980-12-01), Mawhinney
patent: 4241345 (1980-12-01), Johnson
Sperry Corporation
Terry Howard P.
Tubbesing T. H.
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