Hi friends,
Been building regens and came across explanation how Armstrong regens worked. As we all know he placed a secondary on the antenna coil and fed it back to the grid of the tube. The explanation was that a signal is re-amplified over and over again. In fact, I read about "quenching" since the original signal remained in the tube. Sort of a reset was needed. In fact, am building a single transistor FM receiver with a transistor pair cycling at 21khz to reset the FET FM receiver.
Then I came across an explanation on how modern transistor regens work and many circuits did not have the inductive feedback of Armstrong regens. In fact a capacitor across the C and E of the transistor is said to feedback signals from the C to the E and keeps the circuit oscillating. An explanation on how it works (Talking Electronics, 27 Mhz Links) is that the RX is a very low power oscillator and WHEN A SIGNAL APPEARS OF THE SAME FREQUENCY, THE OSCILLATION IS AFFECTED CHANGING THE CURRENT DRAW. This change in current (or voltage) is sensed by an audio amplifier. There is no quenching issues. And the incoming signal is not said to be picked up and regenerated.
Will appreciate comments pls.
Been building regens and came across explanation how Armstrong regens worked. As we all know he placed a secondary on the antenna coil and fed it back to the grid of the tube. The explanation was that a signal is re-amplified over and over again. In fact, I read about "quenching" since the original signal remained in the tube. Sort of a reset was needed. In fact, am building a single transistor FM receiver with a transistor pair cycling at 21khz to reset the FET FM receiver.
Then I came across an explanation on how modern transistor regens work and many circuits did not have the inductive feedback of Armstrong regens. In fact a capacitor across the C and E of the transistor is said to feedback signals from the C to the E and keeps the circuit oscillating. An explanation on how it works (Talking Electronics, 27 Mhz Links) is that the RX is a very low power oscillator and WHEN A SIGNAL APPEARS OF THE SAME FREQUENCY, THE OSCILLATION IS AFFECTED CHANGING THE CURRENT DRAW. This change in current (or voltage) is sensed by an audio amplifier. There is no quenching issues. And the incoming signal is not said to be picked up and regenerated.
Will appreciate comments pls.
