Transmission indicator

Posted on Nov 30, 2012

Everytime 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. The dc output is used to trigger a small silicon-controlled rectifier (SCR1), which permits the current to flow through the small pilot lamp.

Transmission indicator
Click here to download the full size of the above Circuit.

For lower-power applications, such as CB radio, the antenna will have to be close-coupled to the antenna.

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