GOOD SIGNAL TURNING TO JUNK ON PINPOINT

[marsh]

A warm hello from the UK folks. this will be my first post, so be kind.......
I've had my 705 for about 2 months now and love it. but, at times when I've had a good signal..20s, 30s.and turned on pinpoint and move over target the reading will show junk.. -4,-6,or -8.
when its dug its generally rusty old iron, does this rust have an effect on signal numbers. then once when it did this I dug on a -4 and unearthed an english 2pence. has anyone had
this or am I doing something wrong.
Wal

 

[marsh]

May have found some answers on page 3.....

 

[RKW]

The TID upgrades in pinpoint mode. I find that the "final" analysis is usually the most accurate one. I don't dig the junk-ID'ed targets much anymore unless special circumstances cause me to suspect there is a good target lurking next to the bad one.

 

[marsh]

Thanks for that RKW, I must say when I've dug on the junk in pinpoint, its always been Junk, except the 2pence, must be ya head saying dig cos there was something different about the tone.
thanks again.
wal

 

[7centsworth]

I never rely on what the pinpoint says. I have coins all the time read ggood or bounce a little bit , then switch to pinpoint and it reads negative numbers. I just use pinpoint to see where the target is.

 

[Idaho PRB]

I never rely on what the pinpoint says. I have coins all the time read ggood or bounce a little bit , then switch to pinpoint and it reads negative numbers. I just use pinpoint to see where the target is.

Me too on the XT-70.

 

[Tuco]

What might be occurring is that once the detector is in pinpoint it actually picking up the halo of the object's rust. Some of this corrosion may have leaked in the surrounding soil which may give you these junk target id's. Trust what it says when your in search mode. As long as you have a clean tone and a solid number you can ignore what the id is when pinpointing. At least that is what I found to be true for me.

Regards, Tuco.

 

[David]

Besides ignoring the TID in pinpoint(and only trusting search mode) as 3 people said above. Yes you will get good signals in the 20s and 30s and sometimes it will turn out to be rusty old iron, that is a common problem for all of us as rusty old iron is a hard case to solve at times. If you can use the round 9" LF(3 kHz) CC for this and go by the audio tone more than the TID.

Look for a clean audio tone and a solid TID number(as Tuco said) on good targets from both directions, and broken tones and jumping numbers on junk(yes generally but there are some exceptions). Set up a test bed and test different targets on top of the ground for practise. Randy(Digger) might chime in and tell you more on how to handle rusty old iron.

 

[bjgiff]

I've been hunting a very trashy homestead area and trying to get familiar with my detector.

On the last outing I had the sensitivity @ 16 (too low for the area- in hindsight), was trying all the different discrimination patterns, all metal, pinpoint auto and pinpoint sizing, when I'd hit a target. Basically I'd hit a target, go back over it in every mode. I did not eliminate any of the targets via the manual discrimination feature.

I primarily used pattern 2 and 4 when hunting and tried the others, once I found a target. I dug everything and am starting to get some predictability as to what I'm digging. Pretty easy- all junk Just kidding- it has all been nails, pull tabs, a few iron buttons, iron rings etc.. The good thing about it is that I'm seeing how the detector is behaving.

My question- should a target ID the same in Pattern 1, 2 or 3 as it does in 4? Basically I'd hit a target and would sometimes get different readings from different patterns (on the same target before digging).

The other thing I recently encountered is the machine will lock on a "noise" when using pinpoint sizing after it is moved away from the target. Basically it'll emit a tone and a different tone when over the target but the machine will emit a constant tone after "sizing" over a target. Is this normal?

Thanks for the help!
Newbie

 

[Digger]

Patterns are nothing more than a factory default "storage bin" for the notch segments you want to accept or reject. All Patterns are capable of being modified for what ever notches you want (to accept or reject). As such, a target with a notch segment value of 36 (for example) on one Pattern has the same conductivity as notch segment 36 on any other Pattern or All Metal.

If your detector is emitting a tone over a target when using Sizing Pinpoint, and another tone when the coil is moved away, I would suspect one of three things. One, the Threshold is too high. Two, there is an adjacent target causing the detector to produce a separate audio response. Or three, you are lowering the coil as you move it away from the primary target. Try to keep a consistent distance between the coil and the ground, at all times. JMHO HH Randy

 

[marsh]

n/t

 

[marsh]

whoops.. wow, very interesting replies, looks like i need to do more experimenting and get a bit more intimate with me Md me thinks.
thanks for your input.
wal

 

[Hoss]

Good info....Ive had the same thing happen when i move the 70 away from a pinpointed target it increases in TONE and I wondered what was up...Ill try to turn down my Threshold next time..Thanks for this thread...

 

["Dr.Tones"]

I'm with 7centsworth on this one. I NEVER use the TID in pin-point mode. I do watch it when hunting though. If it changes by more than two digits up or down then it's usually junk. For instance, if your'e bouncing around from 34-38 dig it, if it's 28-30-36..... and unstable then it's garbage. I should tell you though that this only works for coins. If you're a ring or relic hunter then you'll be diggin alot more junk. Be sure that your tones are stable too.

 

[bjgiff]

Thanks Digger! Initial thoughts is that my issue is with the thresh hold. Will keep plugging and diggin!

 

[Utuk_Xul]

Well I get all kinds of TID bouncing on good targets such as coins here in my mineralized ground. It usually happens on targets 4"+ in depth for me. I gb at a 4 with the stock concentric and between 11 and 14 with the 10.5" DD. All the magnetic rocks in my soil confuse my pp ID and the TID when in search modes. Just keep in mind that this all depends on your soil conditions which can vary greatly depending on where you are. Bad mineralization can produce odd effects. It comes down to hours put on the machine really. Every machine behaves differently in different conditions.