Try this to get a more stable and accurate TID on the LTD

[jbow]

Some have noted that the LTD's TID does not lock on as well as the original. I have had this problem too and I use it mostly in BP. First Texas recommends that you swing completely across the target with the edges of the coil passing over and past the target... I have found this method to give a jumpy TID on many targets. The correct TID will be in there but there will be a lot of other numbers too.

Yesterday I was experimentig on a quarter that I planted a while back, it has a piece of iron close by and every detector I have has a problem with it. It is about 8" deep. None of my machines will hit it when I turn 90 degrees, they will only hit it form one side but will hit it from both swing directions... but they all have trouble with ID, especially with sotck coils. Well... yesterday I tried a "wiggle". I actually anchored the left rear of the coil on the ground and did a fast wiggle of between 1/4" and 1/2"... and it gave me a consistant 84 to 88 TID. The same as a quarter buried at 3 1/2" about a foot away.

I don't know if it will help to stabalize the TID in all conditions but it is worth a try. I'd try it from different directions and use a very short wiggle. For those who are not fimiliar with the wiggle it is just winiging the coil very little and as I said I even kept one corner of the coil in place on the ground.

I have not tried this in the field on other targets but it worked on this target... and this one is particularly hard to ID and remember I was in BP, tones did not seem to matter much but I usually find that switching to one tone when I am having a problem with TID helps... sometimes going to DP helps but, FWIW... on this target the BC mode told me that it was a bottle cap... it is not a bottle cap!


Julien

 

[Shambler]

First Texas recommends that you swing completely across the target with the edges of the coil passing over and past the target...

They haven't had the LTD out much if they said that. I hunted about 20 hours this weekend and it never once had a stable TID during normal use.

The faster you go across the center of the coil the better the TID. You can demonstrate this just by air testing a slightly on-edge coin. If you can manage a maniac wiggle (which requires a non-trashy environment), you can get an accurate TID. This problem is for real and has caused me to use it only in iron infested tear-downs in 2F mode since I'm digging all non-iron targets. It's a good thing for Fisher this thing is so light.

 

[Cal_Cobra]

I've been using the "wiggle" on my LTD since I got it in November, and on some targets it works great. Sometimes when detecting I'll get just a hint of a target, then will stop and do the wiggle to coax the target up and sometimes it will lock on and you get a good TID#. It also works OK in trash to pick out good targets.

Keep in mind that the TID and audio processes on the F75 LTD are independent processes.

I didn't really realize the value of this until I was thinking about some of my more recent silver finds. For instance I had a Walker silver half that sounded killer, but the TID was terrible. At 6" deep I recovered the walker and rescanned the plug to find there was actually a clad dime almost on top of the walker! Given the TID I may not have recovered this target, but the audio was my dig/no dig gating factor in this example. Had the audio been tied into the erratic TID, who knows, and perhaps that's why this target hadn't been recovered by other detectorists.

At another site, another walker half target (I've been fortunate to find three in the past couple of months) I had the opposite scenario. Initially I had three brass wing-nuts in a more or less triangular formation about four inches deep, and another three inches under them was another walker half. Of course the machine initially locked in on the nuts, and I dug them out. I decided to rescan the hole, and for some odd reason the audio wasn't so great, BUT the TID was dead on for a silver half dollar. I was careful to make sure my hole was wide enough as to not scratch the potential half dollar signal and sure enough a half dollar did indeed come out of the hole at 7" deep!

HH,
Brian

 

[jim tn]

I do the wiggle as well. I've been using the 6 1/2 elliptical a good bit of late and it seems to id much more accurately then the two DD's. HH jim tn

 

[Shambler]

I do the wiggle as well. I've been using the 6 1/2 elliptical a good bit of late and it seems to id much more accurately then the two DD's. HH jim tn

This one is deep for such a small coil. You'll be suprised at what you can find in a small yard filled with iron.

 

[jbow]

My hunting partner has an LTD that has been driving him nuts because he can't get a stable ID number on "garden targets" that the original F75 never had a problem with. In particular a minnieball at 9". The original will give a constant 56 number, the LTD numbers will jump all over the place.

Last week he as trying all kinds of things to try and get a stable number and he said when he raised the disc to 20 that did it. BP mode, any tones, 50 sens, and disc=20 stabilized the TID number !!

I have not tried it but I have noticed the seeming inability of the LTD to give me a stable number on targets in the ground... this was never a problem when "air testing". I think maybe the LTD is so powerful that it is seeing and reporting all sorts of ground minerals etc... but I don't know... what I do know is he said that disc=20 fixed the TID number stability problem for in the groung targets. This may only be a problem in mineralized ground. I think I remember someone-TN having this problem when he got an LTR, didn't like it and sold it.

Any other ideas... I want to hear them !!

Julien