This circuit was found in an American 1980s documentation. The transistorized step is the receiver's last IF and the diode is the receiver's existing detector.
This circuit can be used as an input shield by removing the signal directly from the second port,...
We found this circuit in an old Argentine publication from the 1970s. The transistor can be the...
The telegraph communication system has been out of use for a long time, so the montage presented has...