RADIO EQUIPMENT FOR HIGH FREQUENCY

摘要

PROBLEM TO BE SOLVED: To solve the problem that it is difficult to secure sufficient isolation when selecting respective high frequency signals depending only on the isolation by a switch 31 in conventional radio equipment for a high frequency. SOLUTION: Local oscillation signals are set outside the band of a first band-pass filter 7 and the amplified local oscillation signals of a desired frequency are inputted to a first mixer 6 by an ON/OFF controlled frequency divider circuit 4.