Help! Problems detecting coins near concrete question

[Sebastian]

Hey guys,
I just had a quick question for you. I have an Ace 250 metal detector and the problem I have with it is, it always makes loud erratic noises when I detect near concrete (side walks, foundations of houses, and such). This is unfortunate since that is where you find a lot of coins.
Is there a way you can some how tune that out? the problem I've encountered with tuning it out is that it is so erratic.
Thanks for your time!
Sebastian

 

[Tom_in_CA]

rebar in concrete ?

 

[vlad]

In the old day we would pull out a co-ax loop like Garrett made for the Deepseeker, but don't know of any being made for today's detectors;
they were specially shielded not to read from the sides or top.
About the only thing to try is to cut the sens./gain, and hold the loop the same distance from the sidewalk and sweep parallel
to it length wise, and you can work very close-but experiment.
A smaller loop will help too, but still reads from the sides.

 

[Sebastian]

Wouldn't rebar be just iron sound instead of all over the scale?
Thanks guys

 

[vlad]

n/t

 

[Bleaver]

This works around swing set metal poles. Reduce sensitivity. Swing very slowly toward and away from the pole. A target will give a discrete signal that can be heard separate from the pole. However, there is a point were the pole signal can not be overcom. But this should allow you to pick out targets to 6 to 8 inches out from the pole. This works around sidewalks too but is extremly slow. Vlads recomendation in an earlier post is the best way to cover the area along a sidewalk or similar area.

 

[Sebastian]

Vlad, when you refer to loops e.g. "co-ax loop" and "hold the loop" Are you talking about the search coil at the end of the metal detector or are you referring to the style of swinging the metal detector?
Bleaver, I have an Ace 250.
Thanks

 

[vlad]

'Hold the loop' is a style of I am describing; keep it held, the same distance from the sidewalk without getting closer or further away, and move parrallel
to the sidewalk--walk sideways facing the sidewalk and sweep side to side, don't move in, or out. If you want to change the distance from the sidewalk,
make that a complete new pass--you can see a small loop will work better. [a co-ax is a type of loop that is a total scan, slow response, and shielded not
to read metal from top/sides and unaffected by EMI.] Does Garrett make a Sniper for the Ace line?
If you had a Sunray probe turned sideways and scanned like a loop, might help out, but not super deep.

 

[Sebastian]

OK, I understand now, yes garrett makes a super sniper for the 250. does that coil head shield out stuff from the sides and top?

 

[Bleaver]

I don't think it does shield from the top and sides; but is is a very small coil which will allow you to scan real close to the edge of the pavement.

 

[vlad]

Compass 77b Yukon TR 100kHz
still can be found cheap-other models too
https://www.youtube.com/watch?v=cXxhIVZIrpg

 

[Sebastian]

And that detector shields out interference from the sides and top?
Also, would that coil head fit on a ace 250?
Thanks

 

[digginLa]

Using a small coil should help some to. Whenever I hunt close to a fence, under bleachers or around swing set legs I use the 5.75" coil on my Cibola.