Extended matching range tuner

Details Extended matching range tuner Extended matching range tuner

2007-05-29

2007-05-29

Jones, Stephen E. (Department: 2817)

Wave transmission lines and networks

Coupling networks

With impedance matching

C334S078000, C334S083000

Reexamination Certificate

active

11072132

ABSTRACT:
In a T network tuner, a variable shunt capacitor is provided between the signal input and ground that is ganged to the variable input matching capacitor. The operation is mechanically arranged such that, as one decreases the capacitance of the variable input matching capacitor, one increases the capacitance of the shunt capacitor to assist in high frequency matching, both to increase the maximum matchable load resistance and to decrease the minimum matchable load resistance. The variable shunt capacitor therefore assists at the high frequency ranges to bring the antenna impedances down to the transmitter output impedance, thus to establish an extended matching range tuner capable working between 160 and 10 meters.

REFERENCES:
patent: 2551756 (1951-05-01), Mittelmann
patent: 6670864 (2003-12-01), Hyvonen et al.
Lewis G. McCoy, “The 50-Ohmer Transmatch,”QST, American Radio Relay League, Inc., Jul. 1961, p. 30,31,136.
Lewis G. McCoy, “The Ultimate Transmatch,”QST, American Radio Relay League, Inc., Jul. 1970, p. 24-27, 58.
“The Murch UT-2000 Ultimate Transmatch,”QST, American Radio Relay League, Inc., Dec. 1972, p. 43.
Ulrich L. Rohde, “Some Ideas On Antenna Couplers,”QST, American Radio Relay League, Inc., Dec. 1974, p. 48-52.
Circuit diagram for Differential-T™ Tuner, Nov. 21, 2000.

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