Thanks from the blog go to Ignacio whose kindly forwarded some pictures that let us know the “possible location” for attaching an external signal meter to the Anytone AT6666 series of radios. Below we’ve the photographs and also his words for those who want to have a go at the installation.

I had a look the schematic and apparently  the easier points to find on the PCB should be close the resistor RP500 and IC U505 or close the  U1C LM324.

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