Communication tuning system utilizing local oscillator frequency

Details Communication tuning system utilizing local oscillator frequency Communication tuning system utilizing local oscillator frequency

1978-06-28

1980-11-18

Olms, Douglas W.

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

455120, 455125, 455191, 455197, H04B 104, H04B 106

Patent

active

042349656

ABSTRACT:
The local oscillator frequency in a communication tuning system is selected to either high side mix or low side mix as appropriate to place the local oscillator frequency and image frequency outside the bandpass range of the bandpass filter. This allows bandpass filters having a frequency range equal to approximately twice the IF frequency in a transmitter, and approximately four times the IF frequency in a receiver.

REFERENCES:
patent: 2201938 (1940-05-01), Albright
patent: 3333198 (1967-07-01), Mandell et al.
patent: 3414821 (1968-12-01), Rickers et al.
patent: 3942120 (1976-03-01), Ham
patent: 3942122 (1976-03-01), Nakanishi
patent: 4025855 (1977-05-01), Atkinson
patent: 4115737 (1978-09-01), Hongu et al.
patent: 4132952 (1979-01-01), Hongu et al.

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