CS197010B1 - Method of tuning and marking the broadcast receivers dial - Google Patents

Description

Method of tuning and marking and scale of radio receivers

The invention relates to tuning and scaling of radio receivers, in particular on the very short wave range, preferably tuned by voltage-dependent capacitances by means of a tuning resistor potentiometer, in which the scale resolves to true frequency reception despite variations in voltage-dependent capacitance and resistance tuning potentiometers.

Previously known radio receivers generally have pre-printed scales which are also marked with respect to serial production. Such a procedure places considerable demands on the elements determining the frequency response of the scale. While the tuning of the air-swiveling capacitors has achieved the scale agreement with accuracy and tuning of the swiveling capacitors themselves to deviations of less than 1%, this inductive-tuning tuning procedure is very complicated. Modern receivers use voltage-dependent capacitances controlled by resistive tuning potentiometers to tune the very short wave range. for these elements, it is impossible to achieve such a slight deviation from the prescribed course of manufacture that even satisfactory approval of a pre-printed scale can be achieved. The problem is solved by sorting both the potency of the sweepings and the voltage-dependent capacities.

The result of such sorting alone does not give satisfactory results with respect to the scale of the received frequency, so that deviations and inaccuracies are greater than normal when using a precision mechanical tuning element.

197 010

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Some manufacturers solve this problem by using a rotary capacitor for tuning the range of short wave winds while tuning the stations using the advanced tuning mode of the capacitance - dependent tuning. More recently, this is being replaced by expensive digital frequency indication for the most expensive high-end products.

The above-mentioned deficiencies are eliminated by the tuning method and scale marking of radio receivers in series production depending on the course of the tuning potentiometer, in particular on the very short-wave range, characterized in that after tuning the very short-wave range at predetermined predetermined gold points, distinguish significant frequencies or channels on the Very Short Wave Range scale individually, depending on the actual scale, using numeric or pointer markings to indicate significant frequencies or channels, which are placed at the corresponding locations on the continuous tuning path

By way of tuning and marking the scales of the radio receivers according to the invention, the scale acceptance becomes independent of the accuracy of the electronic frequency determining elements and allows their wider use. Marking significant frequencies by numeral or other means is part of the tuning and scale control process.

Claims (1)

OBJECT OF THE INVENTION Method of tuning and marking the scales of radio receivers in series production depending on the course of the tuning potentiometer, in particular the very short-wave range, characterized in that after tuning the very short-wave range at the gilt points. The channels on the very short wave scale scale are individually labeled depending on the actual scale of the scale, using numeric or pointer markings to indicate significant frequencies or channels, which are positioned at the corresponding points in the continuous tuning path of the scale pointer.