HF Receiver for Beginner Ham

Figure 1 Schematic Diagram of the HF Receiver for Beginner

Capacitor C20 should be with air dielectric. Vernier of any kind would be useful with the capacitor.

Receiver has potentiometer R9 for audio signal. It is useful part of any regenerative receiver where some signals are at the hearing border but another very loud. Capacitor C24 (with help of a switch) grounded first grid of the audio tube. It is decreased noise in the headphones at CW- reception. Any Audio Transformer from an old tube receiver may be used for the receiver.

Figure 2 shows design of the inductors L1- L12. All inductors were wound on empty gun cartridges in diameter 20- mm. Table 1 shows data for the inductors.

Figure 3 shows design of the receiver. At the top of the inductors trimmer capacitors are installed. It is very conveniently for tuning of the receiver at amateurs bands. Figure 4 shows the trimmer capacitors at top of the inductors.

The receiver is easy to tuning and fun for operation. At good parts and inductors made according to the Table 1 the receiver works straight away and at the frequencies close to amateur bands.

Viktor Lomanovich, UA3DH

Picture from 1970s

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