Abstract: Devices and methods for auto-tuning a tunable circuit based on a frequency of operation of the tunable circuit using a clocked frequency detector circuit are described. The clocked frequency detector uses a readily available clock signal to drive a counter circuit to provide an indication of the frequency of operation of the tunable circuit. The tunable circuit, including the clocked frequency detector, can be integrated within a same chip that is autonomously configurable based on the frequency of operation and the readily available clock.

Abstract: An antenna assembly is operative for receiving interrogating radiation at a variable frequency tag and generating a corresponding received signal, and for receiving a signature signal and radiating corresponding response radiation. A logic unit is operative for receiving the received signal and outputting the signature signal in response, the signature signal including a signature code for use in identifying the tag. A voltage controlled oscillator is operative for controlling a rate at which the signature code is output; and a power supply is operative for providing an electrical potential difference for energizing the tag. The voltage controlled oscillator is operable to output the signature code at a rate which is governed by the magnitude of the received signal.

Abstract: An electronic tuning block including a plurality of screw drive type variable resistors are juxtaposed parallel to one another obliquely on an insulating substrate, and holes for receiving pointers fitted to the screws of the variable resistors and holes for receiving rotary knobs fitted to the tips of the screw shaft are formed on the upper surface of a box-shaped insulating case which is fixed to the insulating substrate.

Abstract: A key assembly for receivers for communication systems, especially radio television receivers, comprises a casing, keys adapted for mutual release by means of a spring-loaded locking plate for switching in storable, selectively adjustable electrical values of channel memories consisting of a plurality of voltage dividers for variable capacitance diode tuning, rotary and slidable press buttons associated with the respective keys for channel tuning and optionally for selecting a frequency range, which is adjustable in a preferably pressed position of the rotary press button being different from the tuning position by turning into various locking angular positions, as well as a channel and frequency range indicator scale. According to the invention said indicator scale simultaneously is the locking plate for the keys.

Abstract: An improvement in the indicator driving device for use in a television receiver incorporating a radio receiver is shown. There is provided an indicator driving device of a type in which the selection of a channel for the television receiver and the selection of a frequency for the radio receiver are performed by means of a common manipulating knob. The improvement resides in a much simplified construction and facilitation of work for obtaining synchronization or matching between the frequency selecting variable capacitor of the radio receiver and the frequency indicator.

Abstract: A frequency synthesizer is disclosed in which a single read only memory (ROM) is utilized to directly control programmable frequency dividers in a phase locked loop while also directly controlling the excitation of seven segment visual digital display modules. During the tuning of the frequency synthesizer, an enable circuit disables the programmable dividers while altering the input signals to the read only memory such that direct drive signals are produced by the output of the read only memory which alternately excite two separate seven segment displays modules. After the tuning operation is completed, the enable circuit alters the input signals to the read only memory, simultaneously enables the programmable dividers, and effectively disables the digital display modules such that they hold their previous visual displays.

Abstract: A tuning apparatus includes a dial plate marked with broadcast frequencies thereon, a guide shaft provided in parallel with the dial plate, a substrate having a resistive layer thereon, the resistive layer having varying resistance values distributed therealong which correspond to the broadcast frequencies on the dial plate, the resistive layer being supplied with a DC voltage at opposite ends thereof, a plurality of markers, each slidably disposed with respect to the dial plate to indicate a predetermined broadcast frequency, and each having a first engaging portion and a first electrically conductive slide element for slidably contacting the resistive layer to detect a predetermined DC voltage in response to the location of the markers, a mounting member slidably disposed on the guide shaft in parallel with the dial plate, and including a display member extending therefrom toward the dial plate to indicate a manually selected broadcast frequency, a second electrically conductive slide element for slidably c

Abstract: A combination VHF and UHF tuner is provided in which a common station selector shaft may be rotated a number of revolutions to cover the seventy stations in the UHF band. The common selector shaft is provided with twenty-four detent positions per revolution and in alternate positions of the shaft the twelve VHF stations in the VHF band are received. As the common selector shaft is rotated through several revolutions the VHF stations are repeatedly received but are interspersed with different individual stations in the UHF band. Accordingly, no matter what UHF station is being received, all of the VHF stations are always within one turn of the common selector shaft. In many mixed UHF-VHF reception areas a single turn of the common selector shaft is sufficient to select all of the UHF stations as well as all of the VHF stations which are broadcasting in that area.

Abstract: A tuning apparatus includes a dial plate marked with broadcast frequencies thereon; guide shafts provided in parallel with the dial plate; a plurality of markers slidably mounted on the dial plate, with each marker representing a preset position and formed with a first engaging portion; a slidable mount member formed with leg portions slidably fitted on the guide shafts, a dial pointer extending from the leg portions to the dial plate to indicate a selected broadcast frequency and catchers or sleeves rotatably mounted on the guide shafts and formed with a second engaging portion, whereby the slidable mount member is driven by a tuning knob such that the first and second engaging portions are brought into engagement with each other in response to the rotation of the guide shafts during the preset mode of operation of the tuning apparatus.

Abstract: A channel selection mechanism for an electronic tuner of a television receiver comprises a motor-driven shaft, a voltage selection rotary switch with the contact arm mounted on the shaft, a channel number indicating drum mounted on the shaft for rotation with the rotary switch, a cam wheel having notches on the periphery thereof and mounted on the shaft for rotation with the rotary switch and the drum, and a cam follower pivoted at one end to engage the working surface of the cam wheel to provide swivel movements. The motor is energized by a motor start switch which is operated until a desired channel is reached. A motor stop switch is provided to operate in response to the swivel movements of the cam follower to deenergize the motor to precisely align the channel indicating number to a window provided in the receiver housing.

Abstract: A turret indicator for a television receiver includes a stationary gear attached to a mounting base with a shaft passing through it. A rotatable carrier turret is mounted on the shaft and it carries five rotatable planetary indicator turrets which are programmed with channel numbers, five on each indicator turret to give a total of 25 indicating positions. When the rotatable carrier turret is rotated, the numerals on the indicator turrets appear sequentially at a viewing window in the television receiver cabinet.

Abstract: To provide the required multiple channels for an aircraft communications system, a crystal controlled reference oscillator includes a tunable circuit for changing the base reference frequency provided by a crystal. The base reference frequency of the crystal controlled reference oscillator is pulled in frequency by changing the capacitance shunting the crystal. Two transistor switches change appropriate capacitors in series with the usual oscillator capacitor to obtain the capacitance values needed to pull the base reference frequency and thereby provide additional reference frequencies. The transistor switches are controlled by pilot actuated controls that operate a sliding display mark over a digital frequency indicator.

Abstract: A combination UHF and VHF television tuner having a single detented selector shaft for individually selecting each one of the 82 UHF and VHF television channels and a single fine tuning shaft for providing memory fine tuning of channels in both the UHF and VHF bands. A single digital type channel indicator is used for precisely displaying at a single location the channel number of the UHF or VHF channel selected by the common selector shaft.

Abstract: A receiver selectively and variably tunable to one of a number of broadcast stations has an electro-optic tuning indicator for providing a visual indication of a selected station. The indicator includes a station encoder having a plurality of sets of indicia representative of a plurality of frequencies of the broadcast stations which are arranged to move past a reading station as the receiver is tuned. Positioned at the reading station is an optical reader including a light source arranged on one side of the station encoder and a fiber optic bundle having its proximal end arranged on the opposite side of the station encoder for alignment with a set of indicia. A photoelectric device forming the input to an electrical digital decoder is coupled to the distal end of the fiber optic bundle. The output of the digital decoder is coupled to a digital display.

Abstract: A TV channel indicator wherein the tuner shaft carries a program disc having a plurality of cam sticks, each of which has a cam surface corresponding to a respective channel. There is a panel of leaf switches which play against the cam surfaces to close the switches in a manner dictated by the cam surface configuration, thereby selectively energizing the segments of a seven-segment numerical display to provide illuminated channel numbers corresponding to the tuner shaft position. Tuning of the tuner shaft brings the cam surfaces into registration with the switch ends.

Abstract: A combination UHF and VHF television tuner having a single detented selector shaft for individually selecting each one of the 82 UHF and VHF television channels and a single fine tuning shaft for providing memory fine tuning of channels in both the UHF and VHF bands. A single digital type channel indicator is used for precisely displaying at a single location the channel number of the UHF or VHF channel selected by the common selector shaft. .Iadd.