Регенеративный приемник на 7MHz.
I know that you use the computer. And, I know you cannot beleave it. Because we cannot understand all of inside of the computer, we cannot believe it. Now almost all of the equipment of our life are made with computer, we cannot believe all of them, camera,mobile,excavator,radio,,,,pets,friends. We could believe the valve-radio, because we can draw all of its circuits, in our younger age. So, some friends of my amateur radio station make and use the valve transmitter and receiver,in these days.
I will show you that ,the old triode can be used by low voltage about 12 volts. Please see the circuits. Regenerative radio in old days can make its activity by 17V-DC. Gain of detector(A to B) is 40dB. Gain of audio amplifier(B to C) is -16dB.Please see the old time regenerative detector(fig2). In this circuit, regenerative circuit C2 and L2 made the resonance circuit. Therefore we must tune it,when we make change the receiving frequency. Please see fig1. In this circuit, regenerative circuit is made of high-frequency-transformer. Therefore, I have no need to tune it. In this radio,from 6MHz to 12MHz,regenerative ratio is constant. In this radio, case is made of glass-epoxy-board. I can hear BBC with 7MHz dipole antenna.
Kazuhiro Sunamura, (JF1OZL)