This is the Simple Transmission Indicator Circuit Diagram. This circuit
the push-to-talk button is closed the light will go on. The antenna
samples the output RF from the transmitter. That signal is then
rectified (detected) by germanium diode Dl, and used to charge capacitor
C2.
Simple Transmission Indicator Circuit Diagram
The dc output is used to trigger a small silicon-controlled rectifier (SCR1), which permits the current to flow through the small pilot lamp. For lower-power applications, such as CB radio, the antenna will have to be close-coupled to the antenna.Link
