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US 4,597,106 AGranted
AFT defeat arrangement
AssigneeSarkes Tarzian Licensing Laboratory
InventorAlarico A. Valdettaro
Life of this patent
Estimating the term…
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AssigneeSarkes Tarzian Licensing Laboratory
InventorAlarico A. Valdettaro
Estimating the term…
A pair of stator contacts, which are positioned inside the tuner housing and are internally connected to the AFT circuit within the tuner housing, are positioned so that unused tuning coils carried by the station selector shaft of the tuner are momentarily connected to this pair of stator contacts as the station selector shaft is moved from one detented channel position to the next. Each time a tuning coil is connected to the AFT circuit it defeats the AFT operation thereof and prevents the AFT circuit from controlling the local oscillator until the next detented channel position is reached. When the station selector shaft reaches a detented channel position at least one of the pair of stator contacts is not connected to any of the tuning coils of the tuner so that the AFT circuit is free to control the local oscillator in a conventional manner.
In a television tuner, the combination of a station selector shaft, means for detenting said station selector shaft in a plurality of station selecting positions, an oscillator circuit, a plurality of coils carried by said selector shaft, at least some of said coils being employed to tune said oscillator circuit to different frequencies corresponding to said station selecting positions, an AFT circuit for said oscillator circuit and having a pair of AFT defeat control terminals, and means for connecting an unused one of said coils across said control terminals as said shaft is moved from one station selecting position to another, at least one of said control terminals being disconnected from all of said coils when said shaft is in any one of said station selecting positions.
Dependencies are inferred from the claim text.