Self tracking tuner

Details Self tracking tuner Self tracking tuner

1980-09-08

1982-06-08

Richardson, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455184, 455186, 455195, H04B 116

Patent

active

043343236

ABSTRACT:
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 automatically 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 cooperates with a mixer and a 43.5 MHz oscillator to provide a target frequency signal for use in the self-alignment procedure.

REFERENCES:
patent: 3990027 (1976-11-01), Kawashima
patent: 4122395 (1978-10-01), Schotz et al.
patent: 4130804 (1978-12-01), Mogi et al.
patent: 4270220 (1981-05-01), Hagiwara et al.

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