Continuous tuning control particularly adapted for use in variab

Details Continuous tuning control particularly adapted for use in variab Continuous tuning control particularly adapted for use in variab

1978-12-18

1981-05-05

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455173, 455176, 455192, 455261, 331 30, 334 48, H04B 126

Patent

active

042662958

ABSTRACT:
This disclosure describes a continuous tuning arrangement for a variable frequency response circuit of the type covering a relatively wide frequency range. Many techniques for accommodating a wide frequency range are known and include synthesizers, waveform generators and so on which employ various coarse tuning controls or devices for band selection. A synthesizer is described which employs a continuous tuning means enabling one to continuously tune the circuit from a first frequency to a second frequency or from said second frequency to said first in a rapid manner, whereby continuous tuning is afforded without the necessity of returning the tuning control to a start position each time a new frequency is selected by the coarse tuning control. The continuous tuning means provided according to this disclosure incorporates a variable reactance device in which the magnitude of the control voltage is alternated according to a change from the first frequency to the second frequency as accommodated by said coarse control. In another embodiment, continuous tuning is provided again from a low to a higher frequency by means of a differential capacitor.

REFERENCES:
patent: 2505754 (1950-05-01), Combs
patent: 3008043 (1961-11-01), Caulk
patent: 3233179 (1966-02-01), Klettke
patent: 3409836 (1968-11-01), Wallet
patent: 3505621 (1970-04-01), Miner
patent: 3651411 (1972-03-01), Zlotnick
patent: 3750030 (1973-07-01), Worcester
patent: 3835384 (1974-09-01), Liff
patent: 4081752 (1978-03-01), Sumi
patent: 4175254 (1979-11-01), Manfreda

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