Double superheterodyne tuner

Details Double superheterodyne tuner Double superheterodyne tuner

1983-09-19

1985-11-12

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

333206, 455197, 455315, H04B 126

Patent

active

045532648

ABSTRACT:
In a double superheterodyne tuner, the first local oscillator frequency is set to a value higher than the first intermediate frequency, which is set to a value between three and five times the upper limit of the receiving frequency range. With this arrangement spurious signals of at least third or less order can be prevented from occuring in the first intermediate frequency range. The tuner comprises an input filter which attenuates interference signals whose harmonics equal a desired frequency. The second intermediate frequency may be selected such that it is obtained by subtracting the second local oscillator frequency from the first intermediate frequency which is higher than the second local oscillator frequency. As a bandpass filter for passing the first intermediate frequency may be used a coaxial dielectric filter so as to reduce interferences by undesired channel signals.

REFERENCES:
patent: 4340975 (1982-07-01), Onishi et al.
patent: 4353132 (1982-10-01), Saitoh et al.
patent: 4437076 (1984-03-01), Makimoto et al.

Affiliated with

Also associated with

Rating

Double superheterodyne tuner does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Double superheterodyne tuner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double superheterodyne tuner will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1884083