Self tracking tuner

Details Self tracking tuner Self tracking tuner

H - Electricity

04

B

365/5

H04B 1/16 (2006.01) H03J 3/32 (2006.01) H03J 5/02 (2006.01) H03J 1/00 (2006.01)

Patent

CA 1178384

SELF TRACKING TUNER ABSTRACT OF THE DISCLOSURE A tuner includes a channel or target frequency selection means, a tunable oscillator, a tunable circuit means having at least one tunable circuit, and tuning means, responding to the target frequency select means, for auto- matically and individually tuning the tunable circuit. Typically the tuner includes several tunable circuits, which are tuned successively. The illustrated embodiments have three individually controlled varactor tuned circuits and a varactor tuned oscillator. To move to a new target frequency, the tuner locks the oscillator to the target frequency via a phase locked loop. This target frequency is inputted to the first varactor tuned circuit, and a microprocessor cooperating with a DC detector for sensing the output of the set of tuned circuits steps a voltage step generator which controls the first varactor tuned circuit while the tuning of the other varactor tuned circuits is held fixed. The microprocessor adjusts the voltage step generator to maximize the DC output and signals corresponding to this voltage are stored in a memory. Next, the second varactor tuned circuit having a corresponding voltage step generator is adjusted in the same way, and corresponding signals are stored in memory. This continues until all varactor tuned circuits are locked to the target frequency, after which the varactor tuned oscillator is returned to its standard frequency of 43.5 MHz greater than the target frequency. In a second embodiment, one oscillator remains at 43.5 MHz higher than the target frequency and cooper- ates with a mixer and a 43.5 MHz oscillator to provide a target frequency signal for use in the self-alignment procedure.

378453

Affiliated with

Also associated with

Rating

Self tracking 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 Self tracking tuner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self tracking tuner will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1220124