KB power amplifier. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / RF power amplifiers
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KB power amplifier assembled on 2xGU50 with grounded grids, develops an output power of at least 100 watts. Due to the use of the pre-amplification stage on the KT904, it is enough for him to apply 70 ... 100 mW to the input for a complete "buildup".
(click to enlarge)
The anode voltage source is assembled according to the rectifier circuit with voltage doubling. Screen voltage stabilizer 240 V - on two zener diodes DZ120V and a regulating transistor BU208. When +12V TX is applied, relay J is activated, connecting the antenna to the output P-circuit with its contacts, and a bias is applied to KT904, setting the initial current 2xGU50 = 30 mA (set using a 4,7 kOhm potentiometer). Due to the low input impedance of the transistor preamplifier (about 10...12 Ohm), a 1:4 (Tr) transformer is used at the input. It is wound on a 010 mm ferrite ring with a permeability of 400 ... 600 NN and has 2x8 turns of bifilar winding of a 3 mm wire twisted twice (00,35 twists / cm).
When switching to reception, the voltage from the "+ 12V TX" terminal is removed and it is connected to a common wire, KT904 closes, locking 2xGU50. BD135 also closes, which causes relay J to release and switch the signal from the antenna connector to "bypass" the amplifier to the "Ant. RX" connector. To prevent parasitic excitation, ferrite tubes about 50 mm long and with a permeability of 15 ... 600 NN are put on the anode wires (near the corresponding petals of the GU1000 panels).
Author: Jozsef Kuibus (Y05AT); Publication: N. Bolshakov, rf.atnn.ru
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