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705 won't lock on targets

D

Digger 45

Active member
Starting to think my new 705 is not right. It won't lock on a target, example went to a different park yesterday using it in am then disc with no notches and running it on tracking, i would turn off tracking when locating a target, Pull tab would come up all over from 10,18,32 even up to 40. Seems like every criss cross pattern would give me a different number. Same way with nickels all different numbers.

I check ground phase while in tracking and in low 10 to 18. I have an email in to Bart, i kind of believe there may be something wrong with the coil or the unit.

In my test garden where there is no metal just buried coins the same thing happens, my other detectors do fine locating and locking on the these coins.

Appreciate any feed back!!
 
The first thing to do whenever you encounter something screwy is a factory reset. Hold the chevron button down when you power it up.
If that doesn't straighten it out, then call Bart.

Your Ground Phase numbers seen really low, and based on that I would recommend a DD coil. But....if there does turn out to be a problem with the coil causing it to be acting the way that it does, then those numbers might not be an accurate representation.
 
Hey D45, are the tones bouncing around in unison with the numbers? To be honest, my 705 often has jumpy numbers but the tones seem to "lock" pretty well. I assumed the TID jumpiness was due to lots of crap in the ground with too high a sensitivity-- Ive hunted only trashy parks and trashy yards with it so far.

Let us know how things turn out. I am interested to see if you find a way to get it resolved w/o sending it in.
 
also there is no need to turn off tracking when you have a target but that won't help your problem now. Good luck and keep us updated
 
Here it is folks, called Minelab and they told me the sensitivity is too high, i thought 18 was low, but dropped it to 14 and Bingo works well, only about two digit up or down on a dime and quarter. Started detecting and pulled a token and two dimes out right away, with good distinction of what they were.

Here is the test, run sensitivity as high as you can for your ground but if you get jumpy numbers start lowering the Sens until it smooths out. I asked about depth and lets say you can run at 28 and you set the sens at 14 yes you will loose depth,but running it close to where the numbers straighten out will have good depth. one of the dimes was a good 6" deep and it sounded off loud and clear.

Something else it wouldn't do before was over a target i couldn't hear different sounds just all kinds of sounds and numbers, now i can get a clear signal and keep moving the coil toward my feet and it will break up or change to a lower tone for a bottle cap. When going over the dime it stayed steady and then just stopped sounding as i moved the coil toward my feet.

Looks like the next thing is to go to the DD coil and try it too.

Hope this helps others it sure helped me.

Good Hunting.
 
Ahh yes. Just as described in Randy's book....."Driving in fog with your highbeams on."

It coincides with the low Ground Phase numbers, so you will see a notable difference going to a comparable size DD.
 
Thanks a lot for letting us know how you solved your problem Digger45. Since Ive been having similar--but not as extreme-- issues, I will try that too. I thought I was running Sens pretty low when in the low 20s but it appears as if I should go a little lower. My Phase numbers jump around from the low teens to the high 20s so I might have been a little in the "fog" as well.

Now, if it would only thaw out a little more around here so I could go check out those new settings work....its supposed to be in the fifties this weekend but really stormy......
 
When we say it's a very stable machine we mean it. It should not be chatty at all.
The occasional blip reminding me to slow down and the threshold tone are the only reasons that I'm not constantly checking my batteries to make sure it's still working when I hunt some fields.
 
The 705 is the most stable and target tid correct machine on the market that i've used. The 705 is fantastic.. It is my first choice to go dancing with.
 
Old Longhair said:
Ahh yes. Just as described in Randy's book....."Driving in fog with your highbeams on."

It coincides with the low Ground Phase numbers, so you will see a notable difference going to a comparable size DD.
Click to expand...

Now that the problems been solved, is it ok for me to bring up that you can see a notable difference and feel a notable difference in feel between comparable size DDs.

My apologies, just couldn't pass up this once in a lifetime opportunity to make this point. Thanks, Old Longhair.
 
I haven't ordered a DD coil yet, but will do so next week. I just didn't realize that you must go 12 or 14 to get the 705 to calm down, in some soil you could run higher, the articles that i read always talk about running the sensitivity at 25 or 28 but maybe in other parts of the country this will work.

Also minelab told me something that i didn't fine in the manual is that when you pin point, the number that shows on the screen is close to what the target is. Example if the swing signal is a little jumpy say 28/36/42 when you center the coil over the target in pin point it may say 20 or 22 that is usually what the target is, in my area thats a pull tab.

With the lower Sensitivity most numbers only move a few digits one way or another so its not a big problem.

This unit is a little different over my Fishers and Tesoros but a great addition to my stable.
 
20-22 is also a Flying Eagle Cent ... and some bullets and shell casings ... could be gold or silver ring too ... gotta dig them all to find out
 
here are links to a few posts I've made regarding PP TID. Hope they help. HH Randy

http://www.findmall.com/read.php?55,1279990,1280280#msg-1280280

http://www.findmall.com/read.php?55,1252322,1252532#msg-1252532

http://www.findmall.com/read.php?55,1536021,1536564#msg-1536564

http://www.findmall.com/read.php?55,1440668,1441089#msg-1441089
 
You don't get those rings unless you dig the junk. I have found gold in all different settings so yes you are right the TID is just to give you an idea of what it might be but i just have to see what it is time and time again, thats why i have coffee cans full of pull tabs and 38 rings for last year, 8 so far this year.
 
Great thread folks.....I too always ran my sensitivity around 25-28 thinking I would lose depth at lower numbers. I read Digger's book several times & I get the "fog" thing but I was too worried that I would miss that hidden treasure. Even on ground full of junk I'd keep my sensitivity at 25 maybe going down to the lower 20's but never into the teen's. I have the 10.5",7.5kHz DD coil that I used only a few times just because of all the chatter, jumping numbers,etc. BUT I also had my sensitivity in the mid to upper 20's. Lesson learned & thanks again for the info...........Al
 
I started running the 10.5 DD coil mid summer last year. It make a heck of a difference. IMHO I feel the machine stabilized and the tones and TID were "solid". The one issue I notices was it became very "nose heavy". As light and nimble as the 705 is adding that coil to the end of the stick threw if off balance. My solution was to turn the coil around "backwards" and the balance returned. It didn't seem to effect the coil performance but you get some funny looks and a couple of "um?.....did you know....." questions. LOL
I think that if Minelab was to place the support/fastening ears in the center of the coil that would solve the whole issue.
Maybe Randy could suggest that, my opinion/recommendation might not hold much weight.
 
didn't take me long to figure out to turn that 10.5 around. I had seen a video with a guy with his on that way and it makes a huge difference in balance
 
surfchunker said:
didn't take me long to figure out to turn that 10.5 around. I had seen a video with a guy with his on that way and it makes a huge difference in balance
Click to expand...

Were you watching one of Dr. Tones videos? Where a guy found a cannon ball that ended up being a shot put?
 
I have suggested that the coil ears be moved to a location that better balances the coil. Unfortunately, it is what it is. Which is why I posted this back in December 20, 2008.

http://www.findmall.com/read.php?55,866236,868368#msg-868368


Lots of good information in some of those old posts. HH Randy
 
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