CHANNEL SELECTION DEVICE OF FREQUENCY SYNTHESIZER

摘要

PURPOSE:To decrease the malfunction at the channel selection time by performing the channel selection with push of the key switches of the 1-position digit after pushing the key switches of the 10-position digit and then securing the correspondence between the channel number and the action of channel selection. CONSTITUTION:Key matrix 33 is used for the key switch for the 1-position digit, and terminals 75-77 are provided. Then key switches 78-83 are connected to intersections between lines connected to terminals 75-77 and the lines connected to terminals 34 and 35 each. Here key switches 41-50 corresponding to the 1-position digit are provided independently from swtiches 78-83 corresponding to the 10-position digit of the channel number each. For selection of the 2-digit channel, switches 41-50 corresponding to real values 1-9 and 0 are pushed after pushing switches 78-83 to carry out the channel selection. Thus the correspondence is secured between the channel number and the action of channel selection. In this way, the malfunction can be decreased at the channel selection time.