Output power adjustment. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / RF power amplifiers
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The circuit shown in the figure is simple and can be built into almost any transceiver that does not have an output power control. The cascade on VT1 can be a DSB or SSB amplifier for the first or second IF.
The circuit was tested in the "Radio77" transceiver in the amplifier stage of the IF transmitter.
When using KD413 and IF=5,5 MHz, an adjustment depth of more than 22 dB was obtained.
Instead of KD413, you can use KD419; D9 is also suitable, but the adjustment depth will be less. In the lower position of the variable resistor slider on the diodes according to the diagram, there should be a voltage of at least 1,5 ... 2 times the amplitude of the input signal of this stage.
Author: Yu. Ziryukin (EU3AS), Bereza; Publication: N. Bolshakov, rf.atnn.ru
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