Menu
What's new
Find's Treasure Forums

Welcome to Find's Treasure Forums, Guests!

You are viewing this forums as a guest which limits you to read only status.

Only registered members may post stories, questions, classifieds, reply to other posts, contact other members using built in messaging and use many other features found on these forums.

Why not register and join us today? It's free! (We don't share your email addresses with anyone.) We keep email addresses of our users to protect them and others from bad people posting things they shouldn't.

Click here to register!

Need Support Help?

Cannot log in?, click here to have new password emailed to you

Changed email? Forgot to update your account with new email address? Need assistance with something else?, click here to go to Find's Support Form and fill out the form.

6" DD coil test. Unexpected results.

K

KurtB

Member
While testing target separation capabilities of the 6" dd coil, I put a quarter on the ground with a nickle 2" away from it. I was surprised when the signals were almost always in the iron range. Sometimes just a null sound. Had the X70 in all metal. Put on the 3 khz. 9" coil and had signals from penny to a quarter. Only one signal per sweep but one good signal. Tried this test with an Eagle II, cz-70, and f2. All had concentric coils and signals from penny to a quarter. The cz-70 had a little trouble but could still work a good signal out of it. I wish I had another DD coil for any of my machines to test with. Anyhow, I thought that the 6" dd would be the hands down winner in this test and am surprised at the results. Any ideas?
 
Just went outside cleared some snow off the ground.

X70, Sensitivity = 20, GB tracked in at 20, then turned tracking OFF. Spaced a nasty dug nickel & quarter 2 inches apart, no problem, distinct ID's & tones. No in between, random, or composite ID's or tones. Then I manually ran the GB to 90 and then down to zero, and re-checked the targets, same deal correct ID.

I suspect either you are over some iron objects, or some sort of contaminated ground, coke, slag etc. And if you were using threshold and getting a null then that further points to a object beneath the targets that is dominating and pulling the ID way down into the iron range and below into mineral territory.

I'd change locations and also air test the coins to make sure they ID correctly. The small coil is very fast, so if it is seeing down between the coins at iron it may be affecting the ID, whereas the other concentrics are locking onto the quarter predominately.

HH
BarnacleBill
 
combined with the detection pattern of the coil. I have seen similar results with other digital detectors. One of the Fishers (for the life of me I forget which) will read the combination of a new square tab approx 2" from a nickel as iron no matter how you sweep it. Change the seperation distance a little and all is well.

Its not a perfect world when it comes to hobby detectors!

Tom
 
Did you check the ground for an iron target prior to your test?
Did you auto signal cancel and then auto ground balance?
Did you sweep from different directions?

The reason I'm asking is I conducted a similar test this a.m. with a pewter button and the 9" medium frequency concentric. I found that it read as a mixed signal. I neglected to check the area first and found that I had placed the button near some natural iron that was in the ground. When I relocated the button it rang in loud and clear. Had I been in the woods relic hunting I still would have dug the signal but it would have been iffy. Also, I was in Disc mode accepting everything above -4. Good luck. I think the 6" DD should be a hot coil.
 
and if so, did the results vary?
 
I have a small area that I have cleaned out using different detectors. I did move the targets over about a foot with the same results. Then I spaced them at 3" apart and got separate signals. The quarter was hight tone in the 40's. The nickle was low tone and read 4, 6, and 8. I would think that the quarter would help the nickle read higher. The targets read as they should when tested separately.
 
I didn't see much difference with the DD. The concentrics did slightly better when raised. I suspect this is due to the somewhat cone shaped detection pattern.
 
Kurt,

What I would do next is an elevated target test. Take a plastic container like a 5 gallon bucket, tub, hamper etc with no metal handles. Turn it over, top towards the ground, place the coins on top of that platform, which eliminates the ground, and repeat the test. By eliminating the ground you remove one variable. If the elevated test is normal, the way the coil should act, then I would try a couple distant location tests, not your yard.

And just a couple other thoughts, is Tracking On or Off, stability On or Off, are you in Beach GB mode?

HH
BarnacleBill
 
You must log in or register to reply here.
Top