Power amplifier for CB-radio. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / RF power amplifiers
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When manufacturing a power amplifier, radio amateurs face the question of which active element to use in it. The advent of powerful transistors led to the creation of a large number of designs based on them. However, designing on such an element base at home is problematic for most radio amateurs.
Application in the output stages of powerful modern metal-glass or metal-ceramic lamps of the GU-74B type, etc. difficult due to their high cost. The way out is the use of widely used lamps, for example 6P45S, used in color TVs. The idea of the proposed amplifier is not new and was described in [1]. It is made on two beam tetrodes 6P45S, connected according to the scheme with grounded grids.
(click to enlarge)
Technical specifications:
Power Gain - 8
Maximum anode current - 800 mA
Anode voltage - 600
Equivalent amplifier resistance - 500 ohms
Switching to transmission occurs by applying a control voltage to relays K1, K2. In the absence of such a voltage in the CB-station, it is possible to produce an electronic receive/transmit key, as was done in [2]. Details and design Chokes L1, L5 have an inductance of 200 µH and must be rated for 800 mA. The inductor L6, L7 is wound on a ring 50 VCh-2 K32x20x6 with two MGShV wires with a cross section of 1 mm2. Coils L2, L3 contain 3 turns each and are wound with wire 0 1 mm on Rl, R2, respectively. The P-loop coil L4 is wound with a wire with a diameter of 2,5 mm. Amplifier capacitors - type KSO for an operating voltage of 500 V. For forced airflow, a VN-2 fan or similar is used.
As a relay K1, you can use RPV2 / 7, K2 - REV-15. Rectifier capacitors C 11, C 12 - electrolytic for a voltage of at least 350 V. Diodes VD3 ... VD6 - D248B or others with appropriate parameters. P-circuit capacitors C4, C 5 can be applied variables and their rotors can be displayed on the front panel for tuning.
Setting up the amplifier is not difficult. It is necessary to make sure that there are filament voltages, +300 V, -300 V. In the absence of an input signal, a voltage of -7 V should be present on the tetrode grids, and the anode current of both lamps should be 5 mA. When a signal is applied, by adjusting the elements of the P-loop C4 and C 5, the maximum power of the amplifier is achieved.
Literature
- Ivanov G. - Radio, 1985, No. 3, P.21.
- Koval A. - Radio amateur, 1991, No. 3.C.13.
Author: A. Kostyuk (EU2001), Minsk; Publication: N. Bolshakov, rf.atnn.ru
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