| 摘要 |
PURPOSE:To save number of filters by using a width filter section in common as a transmission filter at transmission in a radio communication equipment provided with a reception section having a width function. CONSTITUTION:The width section consists of mixers 5, 7, a width filter 6 and a width voltage controlled oscillator 10 or the like and changeover switches 23-25 are provided to use the width sectiin in common for transmission/reception. That is, the said width section is connected between the filter 4 and the detector 8 constituting a reception section at reception and a width control voltage is fed to the oscillator 10 from a variable resistor 11. On the other hand, the width section is connected between a limiter 15 and a modulator 13 constituting a transmission section at transmission (SSB), a fixed voltage is fed to the oscillator 10 from a control voltage generating section 25' and the width section acts like a narrow band filter suitable for SSB. |
