A rather unusual detector radio can be assembled on a 6x2p radio tube.With this radio receiver, it is possible to receive signals from radio stations with amplitude modulation on long, medium or short waves.In my area there is not a good enough signal on medium and long waves, so the reception was conducted on short waves.For such a receiver, an antenna is needed, which is a wire with a length of 10 meters and the higher it is suspended from the ground, the better the reception will be.My antenna is a 15 meter long wire dropped down from the 10th floor.It is also desirable to make grounding by connecting the wire to the central heating battery.
The 6x2p radio lamp is a dual diode specially designed to work as a detector at high frequencies.Interestingly, the lamp in this circuit does not require a high anode voltage, only 6.3 V per filament. I used a short wave coil with 50 turns of 0.2mm wire wound on a frame with a diameter of about 1.4 cm.In my area, China radio gives a good signal in Russian, and you can receive it using another coil.But when there is no such powerful signal, then there will be reception from other radio stations.In short, you need to use a coil that will have the best reception in your area.
The transformer in the radio receiver is used by a network-step-down by 220 \ 9 Volts.Connect the high-resistance or mains winding to the anode of the lamp, and connect the low-resistance or step-down through a capacitor to the input of a low-frequency amplifier
If the gain of your amplifier is insufficient, you need to amplify the input signal to the desired level.To do this, you need to assemble a simple pre-amplifier on a 2sc1815 transistor.
So, the receiver is assembled and it’s time to receive signals from radio stations.But it happens that the signals can not be heard or the signals are weak during the day.Wait for the evening and wait for a good signal transmission and you will hear the radio stations.Radio China broadcasts mainly in Russian and its signal is clearly audible beyond the Urals.
In the dark, the receiver looks fascinating.The filament of the lamp shines and illuminates the details.I applied 7.4 Volts to the filament, but this is wrong, since the normal voltage should be 6.3 Volts.The voltage can be lowered using one or two diodes.
