f75 ltd2 weak all metal?

[lytle78]

Mine was one of the first upgrades,

With you only getting 12" in an an air test with a quarter, it's clearly different than mine.

I looked at my notes again and realized that the tests I reported above were before upgrade and at a different location (not near my house). I just went out on the drive and in the heavy EMI comditions near the house I get less depth. On a quarter it's 14 disc 18 AM. Less than I got previously. I need to test it somewnere away from the house, my underground electrical service is sending out terrific EMI after we gor 1.5 inches of rain a couple of days ago.

Still, the AM is clearly deeper on mune than the discrim, both on BP with 99 sensitivity.

Look forward to your bideo. Additional data is always good.

Thanks

 

[detectingMO]

I may do a quick one at lunch before I give it to Bill.

 

[WV62]

From the manual, I am not seeing that boost is a boost processor in the motion all metal. It only carries over less noise and slower response speed.

Ron in WV

bP: BOOST PROCESS
This process is an enhanced sensitivity version of the dE (default) process. It is
particularly useful when searching for deep targets in a non-trashy area, or on a site
where vegetation makes it necessary to raise the searchcoil several inches above the
surface of the ground. It will also produce excellent results on trashy sites provided that
you slow down your sweep speed; sweep the coil slower than you would when using the Default process.
When the Boost process is selected, the response characteristics of
the Motion All Metal Mode are also modified; these characteristics include less noise and a slower response speed.

 

[Daniel Tn]

Just got my unit in this morning. Mine is one of the newly bought ones...non upgraded.

Here are my results with the 11 inch coil and 0 disc:

9.0 Mode. 99 Sens. BP mode. 1 tone.

Quarter - 14.5"
Dime - 13"
Nickel - 16"

9.0 Mode. 99 Sens. Motion all metal mode.

Quarter - 16"
Dime - 14"
Nickel - 18"

9.1 Mode. 99 Sens. BP mode. 1 tone.

Quarter - 13"
Dime - 12"
Nickel - 15"

9.1 Mode. 99 Sens. Motion all metal mode.

Quarter - 14"
Dime - 13"
Nickel - 16"

------------------------------
This was done outside with a non metallic ruler. The machine was VERY quiet in both 9.0 and 9.1 modes. I'm guessing that on mine, 9.0 is the non DST mode and 9.1 is due to the depth difference. There's a 2 inch loss by going from one to the other on the same objects in the same environment. I seem to have misplaced all my data that I had logged for the original F75. At one time I had the air test settings and results for my original F75 and several different coils. I wish I could find it to compare to. Not sure if I'm gonna keep this thing or not.

I will say...I put my NEL Storm coil on there and it livened it up a whole lot. But it takes a 13x14 inch coil to get close to the results listed below by Rick with the stock coil.

 

[lytle78]

I screwed up in my post. The numbers I posted were before the mod. Apologies all around.

Now I get

Disc 0
99
bP
Default gb - 14" with ID

AM
99
bP
Default GB - 18"

I think I could get more than 18" in AM but even with best freq. I have residual bursts of noise in 99 AM BP.

My earlier results were before the upgrade and done in dry AZ desert heat and the EMI was a lot less. Our neighborhood has all underground power and the transformers sit on pads on the ground. After a rain like we had a couple of days ago, the EMI is a lot more severe.

 

[detectingMO]

video is uploading.

9.0, default GB

2f tones

Frequency default (7 I think)

0 disc

no notch

bP

99 sens

14" on quarter

switch to All Metal

14" on a quarter

lower sensitivity to 50

14" on a quarter

switch to de process and 99 sens (all metal)

14" on a quarter

switch to bp 0 sens in disc

10" on a quarter

test with 2l tones to see if AM changes, not change

Not shown. de with 99 sens in disc 12.5" on a quarter

Seems like not bP carried over to All Metal?

Sensitivity really doesn't increase much after 50 sense at least in all metal, maybe disc?

Overall unit has much less gain?

No clue, not quite as bad as I got around more emi but still not right. I thought we were to have option of old f75 and new with dst? I think is more like new without dst and new with dst. dst is on 9.1 for me. results are less depth and slower response

 

[detectingMO]

[video]http://www.youtube.com/watch?v=kdLrrwZ30Vs[/video]

sorry for the wind and sickness

 

[digsgti]

Nice air test video. All metal should go deeper than disc. What's the point? Might as well use 1 tone and disc.

 

[lytle78]

Nice air test video. All metal should go deeper than disc. What's the point? Might as well use 1 tone and disc.

Good point. What is the point really with all metal with a detector which can discriminate to the depths of the F-75?

Now I know that your mileage may vary, but I just took mine out to the lot. Over my 7-8" deep buried (for five years) quarter, in 2l toneI got a good grunt with intermittent squeals and an occasional flash if high VDI 8" above the surface. AM didn't add any real depth (both at 99), but the AM would have driven me crazy with sounding off on every rust flake in the ground.

If anybody shows up at my place and demonstrates how to get deeper coin sized targets wihtout digging endless crap, I will cook him dinner.

Just for fun I put an 11" mono coil on my ML SD-2100 PI detector and that mighty finder of deep gold nuggets managed the grand total of one additional inch of air gap over the quarter.

I am amazed at the depth in BP with iron tones on this machine. My Deus is for sale by the way if anybody needs one.

 

[basstrackerman]

I agree mine is deep as heck in disc mode..i never really use all metal mode ...or rarely... But i did test mine and modes are about even..but i called fisher about that and my pinpoint sound in 2L & 2H and they said easy fix just reload software.. So i may send it in this winter for that and just have them check all metal mode..although they are gonna call me back about that after he talks to an engineer.

 

[digsgti]

The AM mode on my 7a firmware could find civil war bullets at depths that the Disc mode couldn't get to especially in mineralized soil. Sure I would dig some nails along the way but it was the difference between something good at the end of the day and nothing. This worked best in open farm fields and I would never use it to coin shoot parks and yards. I'm sure many of the storied relics found with the F75 were found with the AM mode.

Hopefully the new Disc mode can come through were the old didn't.

 

[lytle78]

All those who wish to bet me that there WON'T be a forthcoming offer from FT to load further tweaked software please just send me the cash in advance.

PayPal addres upon request!!! LOL

 

[michaelnc]

I'm basically a search wherever for whatever type hunter. I'm shocked at the depth with the small coil and I for one will be keeping this detector for all my detecting needs. I just need to get a concentric coil to reduce the bottle cap digs.

 

[detectingMO]

yeah, its a keeper. just wanted to point out that it didnt seem right. I'm sure it can get resolved eventually. I hunt in disc primarily and I have a xterra 705 that is about the same depth in disc and possibly deeper now in prospect mode than f75 all metal..

 

[Mike Hillis]

Hi All,

The F75 LTD Motion All metal mode works differently than the Disc mode.

In the Motion All Metal mode, the Threshold setting controls sensitivity, and the Sensitivity setting controls Audio gain. You set your Threshold, then you set your Sensitivity based upon whatever setting gives you the best audio quality. Then if you want you can fine tune the threshold some more.

Using the 11" DD coil, with headphones, with a Threshold setting of -1 (starting at 0 and just one click down into -1) and a Sensitivity setting of 48 here indoors which is currently experiencing a fair amount of EMI (somethings on somewhere) in 9.0, with Disc mod in DE, F1 frequency, I can get a repeatable response on a quarter out to 15" and a nickel out to 17" before EMI makes it difficult to continue. Its faint but its there. If my EMI would let me get into a slightly positive threshold setting I pretty sure I could hit a good inch or two more on both targets.

Maybe this will help.

HH
Mike

 

[Daniel Tn]

The F75 and T2 are notorious for miss IDing things in the ground. Especially in mineralization. It starts reading non ferrous items as ferrous items. If you run in disc mode, you walk right over all this stuff thinking it's iron because that's where it IDs. The disc modes on the F75 are heavily saturated with digital filters for the sound...thus it makes it extremely difficult to get an accurate "profile" of the target. Especially if all you hear is a short iron grunt. It forces you to dig everything that makes a sound. Some of my deepest relics have came with the F75 that didn't give a ID number at all...just weak audio..barely a rise in threshold in all metal. You can't do that in disc mode. Those targets are non existing in that mode. With a weaker all metal mode, it severely handicapped what was an awesome thing. Here, at best, the F75 could accurately ID things in ground down to around 4 or 5 inches. After that, a silver dime may read as foil at 6 inches before dropping off to read as iron at 7". The old all metal mode let you get a good idea of what was iron and not iron simply by the less saturated filters in it. Even on deep targets you could get an idea...despite what the ID display was telling you. I've dug a lot of deep civil war bullets that would ID around 8-11 on the display in the ground. Then out of the ground they read normal into the tab/zinc range.

 

[lytle78]

Daniel,

I have never hunted for relics in all metal for any length of time. You seem to have done it a lot and with success. How do you go about it?

When your going along in AM with a powerful machine like the F, youmwill be getting bombarded with signals. Do you dig everything? If not, how do you decide what to dig? Since the F-75 shows ID numbers while in AM, i would suppose a loud signal with a steady low ID you would pass up? Obviously a strong signal with a non-ferrous ID would be dug.

Thanks

 

[detectingMO]

Hi All,

The F75 LTD Motion All metal mode works differently than the Disc mode.

In the Motion All Metal mode, the Threshold setting controls sensitivity, and the Sensitivity setting controls Audio gain. You set your Threshold, then you set your Sensitivity based upon whatever setting gives you the best audio quality. Then if you want you can fine tune the threshold some more.

Using the 11" DD coil, with headphones, with a Threshold setting of -1 (starting at 0 and just one click down into -1) and a Sensitivity setting of 48 here indoors which is currently experiencing a fair amount of EMI (somethings on somewhere) in 9.0, with Disc mod in DE, F1 frequency, I can get a repeatable response on a quarter out to 15" and a nickel out to 17" before EMI makes it difficult to continue. Its faint but its there. If my EMI would let me get into a slightly positive threshold setting I pretty sure I could hit a good inch or two more on both targets.

Maybe this will help.

HH
Mike

Thanks, Mike. I just wanted to point out there is a noticeable difference from pre-dst models. Hopefully someone with both or old ltd can compare. Sure you can get faint wispers further out with some tweaking, just wanted a base line. It's no where near where things used to be, well at least from a t2se standpoint which is very close. It's like bP and Cl not longer "boost" all metal. The all metal is the same as say a standard f75 now. At least with units manufactured in 11/14 first wave anyway. You proto testers units or pre nov units "seem" to be much better off... thus your doubt.

 

[basstrackerman]

I knew there may be bugs in a newly updated software..i was ok with that..i still am ok with that..this new F75LTD2 is without a doubt the best detector ive ever used in disc mode.. Deep fast and silent..ive dug a ton of iffy signals with it..they were junk..on the good targets its very clear and if target is mixed with iron the good target always seems very loud and clear.. Almost like the iron sound is a whisper..

 

[detectingMO]

I knew there may be bugs in a newly updated software..i was ok with that..i still am ok with that..this new F75LTD2 is without a doubt the best detector ive ever used in disc mode.. Deep fast and silent..ive dug a ton of iffy signals with it..they were junk..on the good targets its very clear and if target is mixed with iron the good target always seems very loud and clear.. Almost like the iron sound is a whisper..

I agree, it is a great detector. I'm not trying to be a complainer, more like testing and pointing out issues/differences. I'm a network engineer and very analytic, thus my love for detector tech more so than actual detecting. Also has a lot to do with time. If I had more time to detect I'd probably be doing that instead of posting on a forum!