Constant Ferrous Indication

[dmm9623]

Hello to everyone, While using my manticore It's giving me a nearly constant ferrous indication and tone. The indication hugs the upper ferrous limits line and conductivity ranges between 28 to 36.

I've worn out the ground balance, noise cancel, sensitivity and multiple settings to prevent the indication but with no luck. As a bandaid, I've resorted to creating a custom 5 tones profile to block it out but would like to get to the root.

Has anyone seen or heard of such an issue?

I'm heading back out tomorrow to try my new profile and will take a photo to post along with further details.

Best,

DMM

[Stevensimmons]

I would take the skid plate off and give the coil a good wash, ensure my wire is tight and well attached to my stem. Factory reset and start again. It does sound like maybe you are running it too hot.

[EsoxGold]

Could be high EMI in the area

[Chriskend]

Mine has just started doing it, looks like it’s heading back to the dealers.

[Chriskend]

Just a note, it started when I tried the M15 coil and now does it on the stock as well, tried everything all the way to removing the battery.

[LuckyB]

To some degree or another I’ve always had this “bump bump” with my Manticore in all metal, (and to some extent my Nox before it) I don’t think it is a problem with your machine. With the Manticore it shows as an elongated smear in the top ferrous limit around the 30-35 mark which sounds exactly the same as you. It is even described as "Ground Signal" in the manual (page 28). I’ve always put it down to ground mineralisation or just small iron or iron panning in the ground from years of human use. I detect in a wide range of locations and sometimes it is there, other times it is not hence why I’ve just accepted that it down to local ground conditions.

My method for reducing it (and for getting my machine to be stable for any location) is noise cancel for EMI, then ground balance for mineralisation then dial back the sensitivity. I don’t mind a small amount of background noise (I think it shows you have the machine set correctly and using it to its maximum). You will only hear it in all metal so make sure you have your iron volume and pitch set low.

I would think the bigger coil will be more susceptible so that might explain Chris's observation, I find I have to knock the sensitivity back a couple of notches to get the bigger coil stable.

What sensitivity are you running at and are you on stubble or pasture?

[fred]

If you don't Ground balance or run a Manti with the Sensitivity at anything above 20 or 21 you can expect some falsing. Other factors can also determine how unbearable the falsing is. I presume that you haven't accidentally set a threshold tone and you have tried a factory reset?

[Chriskend]

Tried the sens down to 10 and still nuts, coil cleaned, gb and nc and reset a dozen times, popped the battery out for 10 mins and then set sense to 10 on a blank patch in the field with another machine…. Still stuffed, I’ll post a quick vid, just waiting on the dealer to get back to me. I honestly cannot say if the m15 caused it or it’s a coincidence.

B537D5EE-E078-4EE3-B6FC-FD035827D8C8.mov

C675955C-40F9-437B-A923-F0C5AA3C8630.mov

[LuckyB]

Chriskend
That does sound like a fault and not the same issue as OP

[dmm9623]

Here's what it looks like. Second image is a better representation as it lies flat on the upper limit. I'm digging all targets so the only ferrous limit is to block audio on the false signal. Sensitivity runs 15 - 22. It falses no matter the setting. I'll follow all of the recommendations and try again.

[LuckyB]

Thats definitely a ground signal and totally normal, does it vary on different permissions?

As an aside it looks like you are using no upper iron limits? that is going to be really noisy! and how do you know you have a ferrous target without looking at the screen?

The Manticore is not a Nox although there are parallels with iron limits and iron bias however you cannot run the Manticore with no upper iron limit.

I always have my upper limit set at least 7 or 8 so any trace ground signal (and most iron) gives a soft low bump bump.

[Stevensimmons]

I agree with LuckyB, that is the ground and I cannot imagine running with no upper limit, I tried 3 and couldn’t use it.

[PMember]

Hello to everyone, While using my manticore It's giving me a nearly constant ferrous indication and tone. The indication hugs the upper ferrous limits line and conductivity ranges between 28 to 36.

I've worn out the ground balance, noise cancel, sensitivity and multiple settings to prevent the indication but with no luck. As a bandaid, I've resorted to creating a custom 5 tones profile to block it out but would like to get to the root.

Has anyone seen or heard of such an issue?

I'm heading back out tomorrow to try my new profile and will take a photo to post along with further details.

Best,

DMM

The best thing to do is to return it to your dealer (presumably if you still have the warranty). It could be any issue, and if you are not technically minded or cannot figure out the advanced settings, then It would save you a lot of frustration in the end. However, if you are not willing to wait for a repair, then unfortunately you have to play this out until you find the issue, which could be 100 different things.

At the end of the day, you come here for suggestions. Everyone who has replied, has chipped in and have tried to help (thats the beauty of this group-one big MD family) , but if the issue still persists after you've tried all of the suggestions, then do the right thing and get it seen to and repaired by a qualified MD engineer. I would. I hope it will come good in the end. Nothing more frustrating than wanting to go detecting, but realize you can't because of a faulty machine....Best wishes

[Alan Black]

…. Still stuffed, I’ll post a quick vid, just waiting on the dealer to get back to me.

It clearly is faulty so a warranty replacement.

[LuckyB]

In my opinion Chris has a faulty machine , dmm does not