oscilating threshold with my surf master

[OldSean]

Occasionally my surf master dual field's threshold will start to wax and wane on a regular frequency. I wonder if you all would know what adjustment to make. Playing with the threshold just makes it louder or softer. I am afraid to decrease gain because of potential loss of sensitivity. Dose it have anything to do with the pulse timing? Why would one adjust pulse timing?

 

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[Sandman]

This is common these days with the increase of EMI. There isn't much you can do and all detectors are affected, especially PI's. Turn off cell phone....

http://detectorstuff.com/2009/08/05/...-dave-johnson/

 

[OldSean]

Thanks

 

[Fletch88]

If it is EMI, and it probably is, changing the pulse delay will not help. Increasing the pulse delay is used to reduce sensitivity to certain nuisance targets like canslaw.