Tuning a coil to your control box etc...

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AnalogueSkywalker
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Tuning a coil to your control box etc...

Post by AnalogueSkywalker » Tue Jun 26, 2018 5:54 pm

Can anyone give me the full SP on tuning coils to your control box, and how it affects your GB capability? On my Tejon and Laser Trident 2 i now have both machines tuned to a specific medium sized general use type coil. The 11x8DD on my Tejon as its probably more suited to a relic machine, and the 8x9 web concentric on the Trident 2 as its a good general purpose coil for a good general purpose machine.

I have read that its best, however, to tune your control box to the biggest coil that you use, then use the GB to tune in any smaller coil that you use, as and when you use it.

One of the reasons i favour medium sized coils is that they retain the superb lightness and balance, which is all the more important after a recent injury to my detecting arm.

I also own the 5.75 DD and the 12x10 DD, i tend to use these only for more specialised conditions though, such as stubble or particularly clean fields where signals are more sparse.

If anyone can give me a detailed answer on this area of detecting i would really appreciate it, if you tuned your box to your smallest coil, then put on a large DD coil, would this cause any issues? Potential lack of GB range etc?



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Re: Tuning a coil to your control box etc...

Post by Rivers rat » Tue Jun 26, 2018 6:24 pm

Hi it should be fine you may need to reduce sensitivity i had the large tesoro DD once on my retuned lobo (mainly on 5,75 DD and snake coil) and it was unstable i reduce the sensitivity slightly and managed some deep target bare in mind my lobos have both been reduced precisely for each kind of coil 1 for DD the other for concentric


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Re: Tuning a coil to your control box etc...

Post by AnalogueSkywalker » Tue Jun 26, 2018 6:49 pm

Thanks for your reply mate, i just wanted to be sure in my own mind that there can possibly be issues with this. I used to believe that you could wack any coil on and tune it in, i now see that occasional issues can crop up. Best to know beforehand, and all that...

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Re: Tuning a coil to your control box etc...

Post by sweepstick47 » Wed Jun 27, 2018 8:22 am

That's an interesting question ::g and I'm sure that the more inquisitive Tesoro/Laser users amongst us, (which includes me) would lke to know, which components were altered and the procedure undertaken to effect a control box that is balanced/tuned to a specific coil?

I realise that minor adjustment is possible via the various PCB 'trimmers' but these have been supposedly 'pre-set' to specific tolerances during manufacture.

I can see that machines with 'fixed/pre-set tuning' would definitely benefit from this 'individual' to enable coil changing but in the case of 'manually tuned detectors It seems doubtful if any benefit would result. Many thanks for the post. ::g Regards ss47
A disservice is no service at all in my book ::g

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Re: Tuning a coil to your control box etc...

Post by garrettoldboy » Wed Jun 27, 2018 8:57 am

hello, i had pentechnics do just that with a power max 2, made a good difference and worth the cost

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Re: Tuning a coil to your control box etc...

Post by Mud Max » Wed Jun 27, 2018 9:15 am

Well I never knew you could gain a benefit from tuning a control box to a coil, I thought you just swapped coils over and that was that. Is this just Laser/Tesoro machines?
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Re: Tuning a coil to your control box etc...

Post by Roughwood » Wed Jun 27, 2018 10:03 am

Hello All.

Well, this has got me wondering also... :D

I recently bought a 10.5 inch coil for my old Silver Sabre Plus. I simply swapped it over from the original coil and off I went. It has certainly made a noticable difference in terms of depth, although pin-pointing isn't quite as precise (mind you, that could simply be me) but I have no idea about tuning to the control box...?

Questions:
Do I need to do this?
If so, how do I do it?

Any insights gratefully received. ::g

Mike
Tesoro Silver Sabre Plus
Makro Racer 2
Nokta Pinpointer

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Re: Tuning a coil to your control box etc...

Post by garrettoldboy » Wed Jun 27, 2018 10:28 am

hello, you might be lucky a find the up grade coil needs no tuning, i have used them on a few laser detectors and only found pinpointing a problem but maybe due to a larger coil foot print, look on pentechnics web site you can contact via email for information. they are always busy but will reply in due course

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Re: Tuning a coil to your control box etc...

Post by AnalogueSkywalker » Wed Jun 27, 2018 11:39 am

I was advised by Pentechnic about the tuning a box to a coil thing. I think you can get away without doing so in some instances, possibly with coils that are similar in size etc would be my guess, but for optimum performance its best to have your most used coil tuned to the box, or have your box tuned to your largest coil. Again, i am sure many people were unaware of this, and have gotten on just fine swapping the coils then using their manual GB to dial it in. Pentechnic service Tesoro/Laser machines, so have gone by their advice, which to date has always been good.

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Re: Tuning a coil to your control box etc...

Post by Koala » Wed Jun 27, 2018 12:28 pm

There's a tolerance on the manufacture of the coils.

If one is below tolerance and one above then. Ideal setting for one coil will be bad for the other

The adjustment is to turning the ground balance.

Tesoro models that have an external ground balance are never a problem as you just swap the coil and re ground balance

If you use one 90 percent of the time then best setting on this would be the way i would go.

But most of the time the coils are fairly close to the middle of the tolarance and adjustment isn't necessary. When changing between them

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Re: Tuning a coil to your control box etc...

Post by Roughwood » Wed Jun 27, 2018 3:50 pm

Hello again... I hope I'm not breaking any 'hi-jacking' rules, but simply wanted to add this, with regard to my Silver Sabre Plus, which has no ground balance adjustment other than the 'retune' switch...

I have just had a chat with (Dave?) Pentechnics, and basically, he told me that if the coil was behaving itself, it did not need tuning.
(By which I gather he meant that if it was beeping constantly when swinging, it would need tuning.) Well mine behaves exactly as it does with the original coil, so I'm assuming all is well.
He did mention also that if I wanted to tune it myself, I'd need a bit of ferrite and toggle the retune switch in both disrimination and all metal modes.

I know nothing about ferrite (probably should,) is it easily obtainable?

I hope this might help others ::g


All the best,
Mike
Tesoro Silver Sabre Plus
Makro Racer 2
Nokta Pinpointer

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Re: Tuning a coil to your control box etc...

Post by garrettoldboy » Wed Jun 27, 2018 5:11 pm

hello mike, i started with a sabre, i have used the hawk and tejon and still have a power max 2 which i am thinking to sell now, anyway all are good detectors and can still go against the new screen/computer types, check out garrys detecting.co.uk or face book he did a good review, i see it is your first detector so i would say if you like using it and will maybe up grade at some point in future but for now send it to pentechnics ( dave) with the new coil and get him to service and fit that part not sure what he meant but he knows these detectors better than anyone, you can adjust the threshold sound, there should be a rubber stopper on the bottom of the detector, take this out a small screw driver will adjust the sound up or down, when i had mine all i did was switch on put in DISC with a rusty nail near coil and turn knob until no sound, then dig all good beeps, good luck

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Re: Tuning a coil to your control box etc...

Post by garrettoldboy » Wed Jun 27, 2018 5:36 pm

hello, my memory :( it was a Cibola i first bought

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Re: Tuning a coil to your control box etc...

Post by Fusion » Wed Jun 27, 2018 8:10 pm

Quote:"I know nothing about ferrite, is it easily obtainable?"
It's easy to obtain from electronics scrap. Cables such as USB, cellphone sync, digital camera, video-game handsets, often have a cylindrical piece on them near one end. With effort, they can be removed from the cable. Look inside an old PC system case, there's often a few on power cables, internal loudspeaker wires, reset switch etc.
Or get hold of an old LW/MW radio, inside there will be a rod of ferrite, usually 9mm round, sometimes flat, about 7cm long. Remove the wires that are on it.
A browse round a car boot sale should get you some for under 50p.
:(

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Re: Tuning a coil to your control box etc...

Post by Roughwood » Wed Jun 27, 2018 8:26 pm

Thanks for the replies Guys!
It's great to get this feedback - once again shows the value of belonging to this forum...
::g ::g ::g
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Re: Tuning a coil to your control box etc...

Post by Rivers rat » Wed Jun 27, 2018 9:32 pm

If u cancel the ferrite you will be too high isn't????or just about the main thing i believe is to hear the ferrite ,otherwise you could loose small non ferrous targets........on a deus for example if the ferrite is at 85 and you GB manually at let say 86 what happen when you reach clean ground ??When you could actually be at 80........




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Re: Tuning a coil to your control box etc...

Post by AnalogueSkywalker » Fri Aug 03, 2018 4:57 pm

Just wanted to thank all who replied, very helpful.. cheers.

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