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Harbor Freight 9 function mods?

flgliderpilot

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Location
Saint Augustine, FL
Detector(s) used
CZ-21, Minelab Equinox, Garrett AT Pro
Primary Interest:
Metal Detecting
Awhile back I came across a website which described a double discrimination plug ground balance mod for the HF9F. There was also a fix for the meter deflection but that's an easy one.

I can't seem to locate the article. I've played with the pots on the board but can't see any obvious effect on target ID or sensitivity so I am not sure what they do.

Anyone know anything about these mods?

I have two of these laying around and would like to turn them into something a little more useful.


Thanks!
 
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