300W Valve RF Transmitter circuit

  
It consists essentially of three stages and gives the antenna a power of 300 WATT, provided it is properly tuned. The first tier is an oscillator that has an oscillating coil L1 that will be required by the market as a 6SA7 coil. The coils L2 and L3 consist of 60 coils of 1mm cross-section wire wound on a 5cm diameter tome so that they have some shots for better resonance, which is also done with the help of variable capacitors and ammeters. In particular, M1 must show a maximum reading while M2 and M3 have a minimum reading.
300W Valve RF Transmitter circuit - schematic

The second tier, better known as the Buffer (Buffer), is a reinforcement and isolation step together. It amplifies the signal produced by the oscillator and isolates the oscillation step from any changes in the final stage of the transmitter. The final stage or power amplifier consists of lamp 813 and works in class C. The various RFCs used in the circuit do not allow the generated frequency Affect the feed devices.

During construction make sure you avoid long wiring that can cause unwanted vibrations. Plug-in power transformers are required to supply the lamp filaments, since both lamps are powered by 6.3V while 813 to 5V.





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