Worst EMI ever

[markg]

Finally got permission to hunt one of the oldest,
still standing homes in my area. 200+ years of
activity and I was very excited, but. EMI was
such a problem on about 1/4 of the property I had
to move to the other side of the yard. Coil in the air and parallel to
the ground I selected each of the 7 frequencies. Did a
factory reset, no change. Checked the coil connector and it was tight.
No help. My discrimination was on 6 and I started
lowering the sensitivity until I hit 40 and still
no success. Went from DP do DE mode, no help.
The depth meter was continually flashing and ID
numbers randomly appearing for no apparent reason. I
finally opted for all metal, but the ground was
far from clean and I had to finally move. I think
the 5" coil would have greatly reduce the EMI but
that day I didn't have it with me.
I might add one more thing, I could tap the
side of the coil and it would chatter a little too. But
that didn't seem to much an issue at another
location. Still makes a little noise but that is most likely
normal for this high performance machine. My hunting
buddy was using his DFX and had zero problem hunting
in this area.

Last year I had an opportunity to borrow a Gold
Bug Pro DP and can say this is the most stable
machine I've ever used when using high gain
settings of 90+. I hunted some very busy locations close
to HV power lines and EMI was never an issue.
Of course with EMI this bad anything would be an improvement.

Times like yesterday is when I wish I had a Gold Bug for a
backup.


Did miss anything?

 

[mudpuppy]

Weird.. man? Since your buddy was having no trouble, it had nothing to do with lightening ...I know you've been detecting for a long time, longer than me, so I got nothing but that..unless it was something in your pocket,..or something is wrong with your gear..
Mud

 

[markg]

Moved 100 feet north and silence.
I was there trying locate the owners gold ring.
That is how I ended up with permission to hunt.
But on another day, under different conditions all might be different.
Not giving up though.
One thing I've noticed in the past, if you find something the land owner
has lost I usually gain permission to hunt anything they own.
Yee haw...............

ps. I had already dropped the threshold but there is so much metal in the ground I couldn't hunt in all metal mode.

 

[mudpuppy]

Yes! If its a fresh drop, you'd be running low sens and just keying on the numbers based on the size and makeup of the ring right? Just lookin for surface hits and all that..Good Luck, yes, that sure is the right way to make a friend!
Mud

 

[jim tn]

I've got one spot on one edge of a woods I hunt that has a fire station and my LTD goes bonkers when I get within 50 yards of it. I do a frequency shift for the optimum frequency, (still chattery) then increase disc and usually around 7 it quiets down pretty good and then lower sen to around 70-75. At those settings there is a ting here and there, but no problem hunting. And thats with the 11DD coil. Have you fired up the detector since? Good luck. HH jim tn

 

[jim tn]

Sounds like there might be some underground electrical wires or cables???? HH jim tn

 

[markg]

When I got home I hit my test garden and all is completely normal.
I really didn't have time to locate the EMI problem that day, I wanted
to find the ring for the women. Only one thing I can say for sure, of all
the rings I've hunted for people, I have never found one where they thought
they lost it. Completely amazing what, when and how humans loose things.
Self included.

 

[Justin E]

On one of these forums, someone is taking about emi filters you clip onto the wire someplace. Don't know if it'd work or what. Could be worth looking into.

 

[rick in mi]

The only time I had that problem with my F75 LTD was at an old home site were I could not hunt at all because of the EMI. I threw a quarter on the ground and there was so much chatter that it wouldn't see it.Talked to the owner and found out it was there invisible dog fence!!! She shut it off and I had no probs after that.....hope this might help.....hh rick in mi.

 

[cometguy]

I was hunting a house one day and suddenly the F75 went crazy. I did all of the calm down things but was just out of luck. Owner came out and brought her lap dog. The dog wandered around and I made the remark it was nice she had it trained. Oh no, she says, it is the invisible fence. I asked her about it and she said she just flipped it on before coming outside. Once she went back in I asked her to flip it off and the F75 was peaceful once again. Just another thing to keep in mind. Hope you get back there and have better luck. I keep a CZ3d for the EMI areas I sometimes encounter.

Don
HH

 

[dbax]

Markg, your story sounds just like an experience I had, even to your hunt buddy using a White's DFX --
I tried ground balancing an ultimately it would just stick on 90 -- not good. My readings, chattering, blipping and so forth were all over the place,
mostly in the lower ranges, nothing constant. I could bump the side of the coil and it would blip, just like you were experiencing. But then I would
turn it off, go somewhere else and it was much better, then one day it would not even read a quarter on top of the ground. Wet grass seemed to really
irritate it. Sent it in to Fisher and they replaced the coil -- not problem since, but for one thing -- my cell phone seems to cause it to respond erratically so I
have gone to carrying my cell in a case on my hip, as opposed to the lower position in my pocket. Since the new coil and the help and advise from the
guys on this forum my F70 is working great. Hope you cure your problem -- sometimes it is not EMI -- dbax

 

[Steve O]

Also, look to see if the electric feed into the house is above. If it's not, then it is underground, and that will interfere with the f-75 in that area.