Falsing

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Steve Dixon1968
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Falsing

Post by Steve Dixon1968 » Fri Nov 03, 2017 7:51 pm

Had to leave the field early on Wed due to my GMP falsing like mad.
First time it has done this. Coil was very wet from wet grass.
Is this normal?
It worked ok back home?



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Euro Detector
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Re: Falsing

Post by Euro Detector » Fri Nov 03, 2017 8:01 pm

Are there any power lines overhead? Maybe electromagnetic interference (EMI) is causing it.
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Steve Dixon1968
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Re: Falsing

Post by Steve Dixon1968 » Fri Nov 03, 2017 8:31 pm

None in sight

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liamnolan
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Re: Falsing

Post by liamnolan » Fri Nov 03, 2017 8:32 pm

On mine it was the coil cable wrapped around the lower stem. The cure was to wrap them around the top of the shaft and secure with tape. Also make sure the sens is not too high. The control knob is a potentiometer and easily upset so just lower it right down. The wet conditions will make the coil cable heavy, Liam OooO
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Re: Falsing

Post by Doug » Fri Nov 03, 2017 8:42 pm

Do you hip-mount your machine?

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Re: Falsing

Post by Ten pence! » Fri Nov 03, 2017 8:52 pm

Steve Dixon1968 wrote:
Fri Nov 03, 2017 7:51 pm
Had to leave the field early on Wed due to my GMP falsing like mad.
First time it has done this. Coil was very wet from wet grass.
Is this normal?
It worked ok back home?

This has happened to me on a couple of occasions on a very wet clay laden field with lots of small puddles on it, try lowering the ground control in conjunction with a bit less sensitivity.

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Re: Falsing

Post by Steve Dixon1968 » Sat Nov 04, 2017 5:27 pm

Machine not hip mounted, coil was very wet from grass.
I'm going to take my other coils if it does it again.
Lowering the sensitivity helped at first but then it did not seem to make a difference.
I was very upset :)

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Re: Falsing

Post by sweepstick47 » Sat Nov 04, 2017 7:21 pm

Steve Dixon1968 wrote:
Sat Nov 04, 2017 5:27 pm
Machine not hip mounted, coil was very wet from grass.
I'm going to take my other coils if it does it again.
Lowering the sensitivity helped at first but then it did not seem to make a difference.
I was very upset :)
I also have the GMP and it sounds to be power supply cable related. I have encountered this when there is an absence of overhead power lines but soon discovered that the village power supply was located below ground and laid alongside of the road into the built-up area.

If the interference is strongest near a road and lessens as you walk 90 deg.away from it, that's liable to be a good clue! My suggestion would be to move 75 to100 m from the source, switch-off then on again, reduce sensitivity and also decrease slightly the positive 'ground setting' and it should do the trick. Good Luck. Regards ss47
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