| 摘要 |
PURPOSE:To prevent the loss of transmission power by interposing a resistor being a DC load between an output terminal of a mixer diode included in a diode mixer and ground and obtaining a signal having a level in response to the power of the oscillated wave from a potential difference across the resistor. CONSTITUTION:A waveguide directional coupler is omitted and the oscillation wave of an oscillation modulator 2 is given directly to an antenna multiple coupler 8 via a waveguide 3. One of monitor output terminals 23, 24 of the diode mixer 10 is connected to a connection point between a choke coil 18 and a capacitor 19 and the other is connected to ground to lead out a potential difference across a variable resistor 22. Through the constitution above, part of the oscillated wave of the oscillation modulator 2 at the transmission is given from the antenna multicoupler 6 to the diode mixer 10, detected by a mixer diode 15b and fed to the variable resistor 22 as a DC voltage. The voltage is proportional to the level of the power of the oscillated wave and the level of the transmission power is supervised at a monitor terminal. The constitution is simplified and the communication equipment is made small in size and light in weight. |
