This preamplifier for the 6 or 2-meter range was obtained from an American documentation from the 1980s. FETs can be modern equivalents and no information about the coils is given.
This configuration enables the use of low current switches or sensors to control high power loads...
We found this circuit in an old amateur radio manual. The circuit makes use of PIN diodes to...
The purpose of this circuit is to invert the phase of a noise and apply it to the environment in...