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F75LTD disc testing for depth lose or not

WV62

WV62

Well-known member
Thought some of you may be interested.

Was doing a little on the ground testing with the F75 and was a little surprised with the results. My thought was to see if it would lose or gain depth with low or high disc.

I got a spot up on the hill behind the house that is pretty free of trash so that is where I setup. I was using the 11
 
That works on clean targets only but dirty deep or corroded masked and co located coins or targets that is where zero disc works to allow the machine to see through to the good target next to or under or over a bad target. Proven by Tom Dankowski. Also the gain goes up from discrimination setting of 5 down to zero discrimination increasing as you lower discrimination so it makes the machine run hotter better deeper and Id targets better especially with BP BOOST MODE. Just lower the sensitivity and it still goes deep cause of BP BOOST MODE and ZERO DISCRIM. I found a target last night that would have been discriminated out it was reading iron foil nickel and was foil first then was a rusty green corroded nickel under it when I dug it up but it read both targets in the hole. If I had run disc. it would have been blanked out.

I was running it at Ground Ballance 90, BP boost mode, Zero Discrimination, Sensitivity 30-50 running fairly quiet without much chatter noise at all.
30 Was best and it got a bit noisy running it on up to 50 then way too noisy so I couldn't tell if I was missing targets as I was sweeping the coil.

Run through the F1 through F7 channels first and listen for a few seconds to each channel with the coil off the ground parallel to it for the quietest one with sensitivity at 99 maxed out first and in BP mode and Zero Discrimination and set it there, mine was F4 no noise at all. It will get the best depth due to you mitigating the most EMI interferance by doing that first at every location before hunting. Then lower the sensitivity so it's best for you in that area in zero discrim and in bp mode and get the best results without missing targets deep or co located or masked..
 
EtracTom-AdirondacksNY said:
That works on clean targets only but dirty deep or corroded masked and co located coins or targets that is where zero disc works to allow the machine to see through to the good target next to or under or over a bad target. Proven by Tom Dankowski. Also the gain goes up from discrimination setting of 5 down to zero discrimination increasing as you lower discrimination so it makes the machine run hotter better deeper and Id targets better especially with BP BOOST MODE. Just lower the sensitivity and it still goes deep cause of BP BOOST MODE and ZERO DISCRIM. I found a target last night that would have been discriminated out it was reading iron foil nickel and was foil first then was a rusty green corroded nickel under it when I dug it up but it read both targets in the hole. If I had run disc. it would have been blanked out.

I was running it at Ground Ballance 90, BP boost mode, Zero Discrimination, Sensitivity 30-50 running fairly quiet without much chatter noise at all.
30 Was best and it got a bit noisy running it on up to 50 then way too noisy so I couldn't tell if I was missing targets as I was sweeping the coil.

Run through the F1 through F7 channels first and listen for a few seconds to each channel with the coil off the ground parallel to it for the quietest one with sensitivity at 99 maxed out first and in BP mode and Zero Discrimination and set it there, mine was F4 no noise at all. It will get the best depth due to you mitigating the most EMI interferance by doing that first at every location before hunting. Then lower the sensitivity so it's best for you in that area in zero discrim and in bp mode and get the best results without missing targets deep or co located or masked..
Click to expand...

I may be heading out to hunt a little this evening and againg tomorrow for a little longer hunt, I will give your settings a try and see how it does.

Thanks for taking the time to explain.

Ron
 
iron flakes and mineralization will cause you to lose depth on coin size objects
 
Thanks WV62 as I am trying all I can to learn about this machine so I read up about this machine to make it work at it's best for me/us. It's a powerful and quite noisy beast so a little taming goes a long ways and it still will hit deep and seperate lightning fast so as to unmask targets together with that Zero Discrimination setting. Boost makes it hit harder and deep and ID better so sensitivity doesn't matter as much as getting it to run fairly stable. Like the high beams in a fog analogy to much is worse than not enough. Running through the F1 through F7 frequency channels after ground ballancing first gets it to run it in the quietest one possiable as helps to mitigate the EMI issue to make the machine run at it's best/deepest.
 
As an F75SE new-be I find this thread very interesting. I seriously need some tutoring. I also need to spend some time on the instruction manual.

Tom - "Ground Balance 90" How do I set a ground balance of 90? "Run through the F1 through F7 channels"... I wasn't even aware I could change channels.

Bunzee
 
Bunzee,

You can do a factor reset to it and it will change your GB back to 90 or you can just go over to the all metal side and go down to manual GB and change it to what ever you want. But if you want the machine to run its best I would suggest doing the fast grab GB at each hunting site.

Today I hunted 2 areas of the same park and at one site the GB was 54 and the other 69

I have 2 detectors that do not lose depth with high disc settings so I took the 1270 and sampled the area until I found a wheat penny running max disc, then knowing there was a good chance of some older silver. Then I got the F75 out at max disc and about 30 minutes later I had a 1946 silver dime in my pouch.

So that pretty much proves to me that I can use the F75 as what I call a silver blaster. This is what I like to do if I find a good silver site I like to go in and cherry pick the coins before going back and working it for the rest of the goodies that I missed or are a little to get readings on.

Welcome to the forum, you got questions just post.

Ron in WV
 
WV62 good suggestion on silver sucking all but the most hidden masked ones by running high discrim to cherry pick first or if you can't ever come back again or in a hurry limited time to hunt a site makes good sense.

My soil here is like 80-85 ground ballance and Thomas D. said to bump it up 3-5 numbers to help knock out some of the hot rocks and iron/mineral noise from the ground so hence my 90 setting.

Bunzee, WV62 said very well how to get to manual GB but try pushing the trigger forewards and pump the coil up and down a few times till sound is mostly gone or even over a clean spot to do a fast ground grab ballance and it's pretty accurate shows what that number is on the screen after you let go of the trigger and stop pumping the coil. F1-F7 is the frequency offsets from the main 12khz that the machine runs at which is factory F4. You hold the coil up off the ground and parallel to it out in fron of you and have it set at full sensitivity at 99 and push the red menu button and pull or push the trigger once to change the channel then give a listen for a few seconds to see how noisy. Have to push menu button first and hold it and then do trigger each time over and over again to see which of the F1-7 is the quietest channel for that site to mitigate the EMI to get the best possiable depth out of the machine.
 
I had neglected the frequency shifting thinking that I would wait to remedy EMI if needed. Today, normal EMI, but I thought I'd try it to see what if any effect it would have. The second shift the background mild EMI went to silent running! Should I have been surprised that it really had a significant effect? Well, pleasantly impressed for sure!
Tom
 
I am assuming from your description of test that quarter was laying on the ground. If so, a more accurate test would be to bury a quarter at let's say 8" in metal free ground..and then do same testing. Also your Fe3O4 reading would be helpful for interpreting results. Also remember that increased disc definitely affects how accurately one can determine co-located targets. Try burying a piece of iron 1-2" from the quarter and do same disc tests as solo quarter.
 
TerraDigger said:
I am assuming from your description of test that quarter was laying on the ground. If so, a more accurate test would be to bury a quarter at let's say 8" in metal free ground..and then do same testing. Also your Fe3O4 reading would be helpful for interpreting results. Also remember that increased disc definitely affects how accurately one can determine co-located targets. Try burying a piece of iron 1-2" from the quarter and do same disc tests as solo quarter.
Click to expand...

Your assumption is correct I put the quarter flat on the ground and stand over the it and high swing, I like this way over just an air test. You are probably right about burying the coin being more accurate or at least a better way to test. But for what I wanted this go around I just wanted to see if the distance to the coin went down, up, or stayed the same with higher disc settings. For the most part this test tells me the F75 does not lose depth just because the disc is set high. As for the Fe304 reading it was .03.

I tested another detector of mine the same way and the detection distance when down by half, so I couldn't expect to make a silver blaster out of that one. If it will not detect it on top of the ground it will not do it in the ground.

Ron in WV
 
Thanks Dave J for the clarification on channel first GB second got to remember that.

WV soil and target density within will determine depth and coin recognition so discrimination and sensitivity will be dependant on that. Like the high beams in fog analogy too high of sensitivity and or combined with discrimination will be worse bouncing back off soil hot rocks minerals and tiny targets messing with you and good from non existant targets. You want it reasonably smooth which should be better for depth in conditions that will determine that and disc levels.
 
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