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Post by goldenage on Jul 4, 2013 15:46:40 GMT 10
Hi one and All,,
Not only have I got the 3000 together but I'm trying it out on a fossicking area which is now relieved of 3 bullet leads, 1 22 cartridge, 1 rusty shoe tack, sundry bits of tin and wire but none of the yeller.
Perhaps I have a problem with the machine. . whether it is on the ground or held up in the air there are sharp spits of sound as if it passed over a target every couple of seconds, I tried another coil and the same thing occurs. IS THIS NORMAL.. I understood the threshold should be a constant even sound-- a constant sound which blipped only when over a target.
Has anyone had this problem?? How was it cured??? Do thresholds behave like that???
If its okay, well okay,, but I would like to know if its signalling the box may need a repair.... goldenage
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Post by kawman on Jul 4, 2013 16:17:38 GMT 10
Hi..  I don't know anything about metal detectors.. Low tech way... I think you need to get a piece of gold and wave your detector over it.. ;D |
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Post by Rowdy on Jul 4, 2013 16:49:43 GMT 10
You should be able to get a constant hum which sounds a little bit like a mossie all the time, and when you move the coil over a target it should increase in relation to how big the target is and how close to the target you are.
If that's not happening then you have a problem either with the machine or leads.
Are you using headphones or a speaker? Check all leads by wriggling them with the machine turned onand see if the noise is related to lead movement. Bear in mind that any lead movement at the coil lead where it enters the control box will result in what can be often mistaken for a target.
If you cannot track down if the machine has a problem then it may need to go to minelab for checking, just hope it's not a modified machine because minelab won't even bother to look at it if it is.
Rowdy
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Post by nugget893 on Jul 4, 2013 17:45:24 GMT 10
Hi Goldenage These spits or what I would call spikes of sound may be EMI coursed by electrical interference. Have a look were you are detecting and see if you may be close to houses or over head electrical wires. Also check what Rowdy has suggested. Also try another spot completely well away from where you were when you started to have trouble.
nugget893
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Post by nipper on Jul 4, 2013 17:51:41 GMT 10
Hi goldenage , it sounds like it may be electromagnetic interferance or EMI , this is caused by radio frequencies in a similar range the detector is operating in and is a common problem, causes could include transmitter towers or electrical storms ,other detectors nearby or others.
hold it still and listen, if its still happening its prob not loose leads or such.
do you have a manual? check which direction the most interferance is coming from by slowly turning in a circle while holding the detector at waist hieght ,then put the tecta down on the ground and push the tune button leave it and wait for the beeps. try if running in mono makes a diff , running in cancel can help as last resort but you will lose depth.
good luck
nipper
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Post by slippery79 on Jul 4, 2013 19:16:35 GMT 10
I agree with the EMI for sure, electric fences is another one to look for, if you want to continue in the area dd coil will be better than mono when you find the right settings  |
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Post by goldenage on Jul 4, 2013 21:19:29 GMT 10
Hi to one and All for your suggestions re spikes in my 3000 threshold. It has blown me away and I find it really reassuring to get help.. Thank you all. To fill you in with details= I have been at glendon for four days,, well out in the sticks because I wanted to be away from the EMI etc in suburbia as well as well away from the caravan centre itself at glendon. Soooo I'll check out the leads etc. I have thought that perhaps the pins of the male and female connectors may need a clean.. just a thought. I tried the 11 inch coil for two days and the joey for two days but the spikes were there whether I was detecting or holding it up in the air. The spikes were there when doing the initial tuning -- turning in a half circle with the coil vertical and at waist height. In spite of the spikes today I relieved mother earth of another light load of junk - the smallest being what I think was a shotgun pellet. But the spikes leave me thinking that I could be missing more targets. I wont rest until I beat it now that I know its abnormal.. Thanks fellers!!!
When I first turned on and tuned it the wife (cunning devil) cast 5 very small split sinkers into the sparse knee high grass and commands"find em". Well,, it took about an hour but the detector made me feel proud as I handed her 5 split sinkers plus a 22 lead which made the sweetest sound.
Oh another thing,, I believe the coils I have are DD.
Commitments force me back to suburbia in the morning and I'll work on your helpful suggestions.
Let me say again, thank you all for concerns shown,, it feels so great in a humbling way to get your help..... kindest regards,,,goldenage...
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Post by goldenage on Jul 4, 2013 21:26:17 GMT 10
Hi again,
Rowdy expressed a note of concern that my 3000 may be modified.. Are there any outward appearences to indicate modification?? I would not have a clue if I opened it up and I naturally don't want to.. But can modifications cause audible spikes??......goldenage
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Post by Rowdy on Jul 4, 2013 22:06:12 GMT 10
Audible spikes can also be caused by dust and or moisture under the coil skid plate. If you remove the skid plate and clean under it and then reseal it with tape you may find that it reduces these spikes.
Just remove the old tape and then carefully remove the skid plate. You may need to use something thin such as a paint scraper, to cut the spots of silastic that are between the skid plate and the coil.
I have found that if dust builds up it can make a coil very sensitive to touching blades of grass and bumping rocks etc.
Regardless of if this is the problem it certainly won't hurt.
Even if the skid plate and tape look to be in good condition you would be surprised just how much dust can accumulate between the coil and skid plate.
Rowdy
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Post by nugget893 on Jul 4, 2013 23:24:28 GMT 10
OK Goldenage there are 2 more thing to check Firstly, if you are wearing head phones check them ( try another pear of head phones) Secondly check your battery and battery conections. I had a 3000 and it was playing up and I found out it was the battery. Luckly I had 2 battery's. You may have to got to a detector shop and see if they can help you out with these items so you can check. A modified detector has more switches on it that don't look standard. Has it got a ground track button on the hand grip? If so then it may have been modified, as the 3000 did not come out with one. Try and switch back and forth from Mono to DD and see if that will help. Ground balance each time you do it. Also have you got the 3000 manual ?? If so go right through that and start your set up as to the book.
Good Luck mate
nugget893
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Post by goldenage on Jul 5, 2013 4:36:46 GMT 10
Hi nugget893,
Last evening I read the replies, answered in thankfulness,, had a restless night and it is now 4.24 am and I turned the puter on to read your reply. Many thanks nugget,, you've given me more clues which as a newbe and not a technical whizz I feel I sorely need. When I'm home I'll take a run over to Brisbane Gold and perhaps they'll help with the battery. There are no extra switches on the box or hand grip so I take it it is not modified. Yes, I downloaded the manual, but in my enthusiasm I took only the startup page bush with me. Sooo, more reading!!! Kind regards nugget,, goldenage.
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