Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1978-01-19
1980-10-14
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
333 32, 343852, 343860, 455291, 455292, H04B 118, H03H 738
Patent
active
042285445
ABSTRACT:
An antenna system is disclosed for plural band radio receivers having a common antenna. The system is especially adapted for AM/FM automobile broadcast receivers and may be used with a CB transceiver with a tri-band antenna. An impedance transforming means is provided at the base of the antenna and a single transmission line or lead-in cable extends from the impedance transforming means to the AM/FM receiver. The impedance transforming means has a high input impedance for the AM and FM bands and a relatively low output impedance to minimize the signal loss in transmission from the antenna to the receiver. The impedance transforming means includes a field effect transistor in a common source configuration and means are provided to produce substantially 100% voltage degeneration for both AM and FM signals. The impedance transforming means is also useful for automobile AM broadcast receivers to avoid the need for alignment of the antenna trimmer after installation of the antenna and lead-in cable on the automobile.
REFERENCES:
patent: 2135234 (1938-11-01), Fill
patent: 2529370 (1950-11-01), Bell
patent: 3051903 (1962-08-01), Morrow
patent: 3582791 (1971-06-01), Slavin
patent: 3725942 (1973-04-01), Ukmar
patent: 3965426 (1976-06-01), Ringland
patent: 4001696 (1977-01-01), Bannerman
patent: 4095229 (1978-06-01), Elliot
Terman, "Radio Engineers Handbook", 1st Ed.; (McGraw Hill, 1943), p. 430.
Johnson, "Amplified Car Radio Antennas", Radio--Electronics, May 1972, pp. 37-39, 78-79, 88-91.
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