There is so much discussion about hunting in an area infested with nails but I need advice as to your technique when hunting in a bed of aluminum. I usually hunt with low disc settings but the detector sounds like a machine gun if run like that. I figure I'll try running DISC=50 with a notch for nickels and see how that goes (I have never used NOTCH), and maybe switch to the small coil (I've got a lot of area to cover) but I'm curious what others are running on their F75. The site dates back to the mid 1850's but overlaps a ball field and park. The area has recently been graded so time is of the essence before the pavers arrive.
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F75 LTD in a Bed of Aluminum
- Thread starter go-rebels
- Start date
Back in Jan. when we had a quick thaw, I was short on time and ran with Disc=50, 2F tones,bp mode and managed 75/upper 80's on sens. Fast-grabbed and took off only digging solid repeatable signals...Worked for me that day in that yard. I pulled alot of coins in a short period of time and 3 were silver, and I was achieving depths that I was very happy with that day!...However, other settings may provide you with better results!?!....Good-Luck!
If it were me, I'd leave the larger coil on it and dig a few (probably 10 - 20) of those aluminum buggars and set the disc to remove them from detection... You'll probably loose some of the green coppers and possibly some tokens 
if you set the disc to high, but you'll find the silver... Sure is a shame you don't have more time to hunt that spot as it sounds amazing...
HH Robert
if you set the disc to high, but you'll find the silver... Sure is a shame you don't have more time to hunt that spot as it sounds amazing...HH Robert
I've got some spots like that and I pretty much grin and bear it, so to speak, running my usual settings...and I don't use notch ever, either. Can slaw can id from the low 20's to into the 50's depending on their size, so notch on a good old site like that can knock out some goodies. Although not always, slaw pieces usually are a little more jumpy vdi wise where as good targets tend to have a tighter vdi reading. Hence, in those lower readings I would be inclined to dig just those tight vdi readings that sound good and repeat tight readings...and, still plan to dig some can slaw. Good luck, sounds like an interesting spot. HH jim tn
I just need to raise the DISC and learn to hunt in a different way. This place appears to be an aluminum trash dump with numerous pieces of can slaw, beaver tails, pull rings and more modern rectangular tabs everywhere. I mean a dozen or more hits in one left-to-right sweep of the coil. I can't even tell if the signal is broken or not since before the 1st signal ends the next signal is on top of me! I've set the SENS into the 50's to give a silent background on a rare patch of clean dirt but the audio is like a machine gun hunting in my usual F75 fashion.
Maybe I need to invoke the CL mode and run Minelab slow.
Maybe I need to invoke the CL mode and run Minelab slow.
I don't think you can set the disc high enough to disc out aluminum can you? If I were you i'd try all the different tone settings but using DP... after a little practice, I think you'll be able to ID most of the aluminum. If it's ragged DP should give you a different tone from something round or less alloyed. DP isn't my favorite tone setting but in that case I think it'll work. The numbers may be a little more reliable in one tone.
J
J
I find the VDI to be a little different in some of the different tone options. The manual says that BC and DP both process the VDI differently from others. I don't know about all the modes but, IMO, some are a little better on the VDI than others. Try the different modes on a known target and see that you think. I thnk some do more of a snapshot and some do more of an average from the scan.
J
J
jim tn said:Small bits of aluminum may sound like a silver coin, but they don't read anywhere near a silver coin!HH jim tn
Unfortunately that's not always the case from my experience. Many non-shallow mercury and older silver dimes tend to read in the 60's in my soil on the LTD in boost mode, and don't typically lock in well (unless their shallow, which is almost never the case), and I've found many oddball bits of aluminum that tend to mimic this result, including some beaver tails. Something that I dearly hope Fisher works to resolve on their next flagship detector.
HH,
Brian
What tone option in BP mode do you guys find to be the most accurate on TID? I find that targets rarely report text book TIDs, although once and a while they surprise me. I dug an honest abe 10"-11" SLQ a few weeks ago that locked on to a nice mid 80's TID, and I was very pleased to pull up my second SLQ in two years of hunting 
I've not experienced any low 60 readings, Brian, on shallow or deep silver...unless there was some type of trash over, under, or very nearby the coin. In fact, for our club hunts, we burry silver 1-2" and nothing has ever read lower then 73-74. I am currently finding with the LTD that silver is reading very high in the bp mode in 3h and 4h tones. For a while, I was thinking it was just my ground, which has been very wet, but we've not had rain now for a while and a 47 Rosie that I dug yesterday pretty well locked on 77-78. One silver quarter recently read near 90 and another one was 87-88. I really don't have a problem with those higher readings, but they are reading higher then they did with my regular F 75 and certainly no where near what the manual says they should read for the LTD. HH jim tn
jim tn said:
If only silver coins in the wild were 1-2" deep (of course we wouldn't need F75 LTDs then either).
Once thing I've found interesting with BP mode is that barber and mercury dimes read (even in an air test) in the high 60, low 70 range, but rosies are higher, mid-high 70's. The difference is probably our mineralization soil in CA. I get the same results on quarters as your seeing, but it's those scrappy pieces of aluminum that get me. I dig loads of bottle-caps and tabs at some places, and boy do they sound great (well some of them at least). I once dug a square tab at 9" deep that I was sure was going to be a silver quarter. The LTD in BP mode is definitely up-averaging high conductors IMHO, and playing around with TID's to some extent.
I guess if it was easy everyone would be doing it right?
HH,
Brian
Low-Boy/LCPM
Active member
I like to hunt in 2f tone disc 0-4 I hear the grunt of iron and the tone or a relic if I am hunting in a lot of iron then mono tone 6 disc and if I am at a park or school sometimes I will hunt in 0 disc and four tone.
In my ground, Merc.'s and Rosies id the same. I haven't snagged A Barber yet with the LTD. I have had the same thing happen a few times on deep tabs reading in the high silver range with my F 75 and the tone was pretty good as well. Coin for coin, vdi readings on my LTD definately aren't the same as on my F 75. Nor seemingly on like coins is vdi consistent. However, it did seem more consistent today. Maybe the ground is drying out a bit. I am going to give the LTD a couple more weeks and if vdi doesn't improve, it will be making a little trip. HH jim tn