The signal from this transmitter is injected into a cable that you want to follow along a pipeline. Monitoring is done using an ordinary AM receiver out of season.
This circuit was found in an English publication from 1989. The integrated circuits are of the...
This commercial radio with 3 earphone listening transistors was manufactured in Japan in the...
This circuit for RF measurements at 200 MHz was found in no documentation two years 80. At a...