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The rate of RA tracking can be regulated with these handsets. Inside the handset is a variable resistor which can be turned to fine tune the RA tracking rate. Accessing the variable resistor means opening the handset. But with a little ingenuity a hole can be drilled into the top plate of the handset and a little toggle attached to the resistor poking up through the handset so it can be manipulated with the handset closed. The pic below shows the location of the variable resistor inside the handset.
Thanks for looking,
Alex.
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