Matching antenna (CB7458E)

The coil and sockets of this circuit found in a QST depend on the frequency band that is intended to be tuned.

Low Pass Filter (CB5198E)
This circuit uses only passive components calculated for the desired frequency. We found it in an...
Pocket Signal Generator (CB13159E)
This unijunction relaxation oscillator can be used as a very useful signal injector. The circuit is...
Frequency divider with varicap (CB6826E)
Found in a 1965 Electronic Design, this circuit divides the frequency of a 50 MHz signal by 2. The...