17 Inch Coil Keep or Sell!

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detectorman5050
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17 Inch Coil Keep or Sell!

Post by detectorman5050 » Wed Aug 29, 2018 10:09 pm

I've got the 17" by 13" coil for the CTX, as part of a package. It is totally unused, and I've stuck with the standard coil so far. I am considering selling it, to subsidise the cost of the CTX.

I have used 'jumbo coils' on other detectors in the past, and they seem to only improve depth by about 30 percent on average, plus pinpointing seems to become less accurate.

My impression is that the main advantage of this coil is 'ground coverage.'

My question is, what is your opinion of the 17 inch coil? Is it a 'must have' piece of kit?


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Re: 17 Inch Coil Keep or Sell!

Post by Easylife » Wed Aug 29, 2018 10:25 pm

If it gets an extra 30% depth increase then surely it's a keeper. x;
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Re: 17 Inch Coil Keep or Sell!

Post by detectorman5050 » Wed Aug 29, 2018 10:53 pm

Easylife wrote:
Wed Aug 29, 2018 10:25 pm
If it gets an extra 30% depth increase then surely it's a keeper. x;
On average 30% extra in comparison to a standard coil, is about 2 inches. I am basing that figure on 'big coils' from other metal detectors.

I'd still be interested in hearing from people who have used this coil. Did you have problems with pinpointing, falsing, or even the weight of this 'monster coil'?
Last edited by detectorman5050 on Wed Aug 29, 2018 10:55 pm, edited 1 time in total.
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Re: 17 Inch Coil Keep or Sell!

Post by fred » Wed Aug 29, 2018 10:53 pm

Depending on exactly how and where you use the CTX the 17x11 gives you 2 or 3 inches extra depth and considerably more ground coverage. It is possibly a little less sensitive than the standard coil. What is does do brilliantly is unbalance the CTX. Fortunately I found that I prefered the standard coil anyway as the machine actually seemed more stable with it. :D
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Re: 17 Inch Coil Keep or Sell!

Post by detectorman5050 » Wed Aug 29, 2018 10:56 pm

fred wrote:
Wed Aug 29, 2018 10:53 pm
Depending on exactly how and where you use the CTX
I am increasingly on the beaches at the moment with no discrimination, but hope to get back to fields soon.
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Re: 17 Inch Coil Keep or Sell!

Post by killer140269 » Wed Aug 29, 2018 11:00 pm

im in the same boat won a ctx 3030 in a raffle for a tenner it was the leisure promotions package with stock coil ,seventeen inch coil and pro pointer 35 worth £2000 but im only using stock coil and thats to heavy for me arms aching afer a couple of hours detecting been trying to sell the 17 inch coil never been used but no takers only want £200 so i can get an harness

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Re: 17 Inch Coil Keep or Sell!

Post by killer140269 » Wed Aug 29, 2018 11:10 pm

sorry forgot to say i was over the moon winning the ctx for a tenner but pennies are very tight at the moment thats why im trying to sell the coil for the harness

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Re: 17 Inch Coil Keep or Sell!

Post by Mac91 » Wed Aug 29, 2018 11:19 pm

Personally I love the big coil and barely use the stock one. Then again signals on my sites are fairly sparse and deep so the extra coverage makes all the difference.

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Re: 17 Inch Coil Keep or Sell!

Post by fred » Thu Aug 30, 2018 4:53 am

killer140269 wrote:
Wed Aug 29, 2018 11:10 pm
sorry forgot to say i was over the moon winning the ctx for a tenner but pennies are very tight at the moment thats why im trying to sell the coil for the harness
Might be worth selling off the whole package and getting something lighter but nearly as good and pocketing the difference? :D
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Re: 17 Inch Coil Keep or Sell!

Post by garrettoldboy » Thu Aug 30, 2018 7:22 am

hello, £300 for a minelab smart coil !!!!!!!!, i tried a similar coil on my safari and hardly made any difference to the original DD, out of interest i did the same on a Laser detector but that did make a difference in depth but a bit iffy on pinpointing so bigger holes

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Re: 17 Inch Coil Keep or Sell!

Post by jcmaloney » Thu Aug 30, 2018 7:25 am

Its a beast of a coil and gains both ground coverage and depth.
How effective it is depends how you detect, if you "use patterns" there is more info for the machine to process & potential for more targets under the coil.
The "weight & balance debate" could go on for ever! ::g
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Re: 17 Inch Coil Keep or Sell!

Post by littleboot » Thu Aug 30, 2018 8:31 am

Not used the CTX but I have a big coil for my Goldmaxx. That weight and balance thing is the biggie for me. I may cover ground quicker...but as its so unwieldy I can only detect for half as long as normal! Pin pointing with bigger coils is always more of an inexact science so retrieving any signals takes more time.
I have big open spaces with nowt much in them (well they might have but I haven't found it yet) and the problem is its tiring enough just plodding around it for miles without trying to swing a brick and then dig monster holes. I then have small areas of occupation within that, very busy with clutter but where 90% of the finds hang out....and the big coil is no use at all for obvious reasons.

I think you answered your own question: you haven't used it. It strikes me that the CTX is a beast anyway so unless you are virtually a pro then the standard kit should be more than ample and plenty to think about/ get used to.
Sell it if you don't use it....but obviously that depends on the price and have a lower limt in mind otherwise you might as well keep it. Bear in mind you seem to change machines a lot and it could be that you want to sell the CTX itself at some point and would it be better to keep the package together in case of that eventuality.
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Re: 17 Inch Coil Keep or Sell!

Post by CTX_Phil » Thu Aug 30, 2018 9:16 am

I have all 3 coils for my CTX and in most situations I'll use the 17". 6" coil comes out on rape stubble and sometimes maize stubble plus really iron infested areas, standard coil usually only gets used on really rough plough and the 17" gets used for everything else. Some will say that the 17" isn't as sensitive to small bits but I've personally never found small bits a problem to find and whether it gives me more depth no idea as I'm not comparing signals between coils. I find pinpointing isn't a problem with it and I know for a fact with the 17" I'm covering more ground and overlapping my swings more thoroughly when I'm doing systematically lines which is mainly how I search. 17" coil is also a must for the beach as you'll want to cover as much ground as you can there. Weight wise yes the 17" adds weight so if you're looking for lightness probably not the way forward!

If you decide to sell I can't see why you'd have a problem getting rid as the big coils don't come up that often as I found out recently when I snapped the shaft lugs on my 17" and had to spend nearly £300 on a new coil as I couldn't find one to buy from a non-retailer!!!

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Re: 17 Inch Coil Keep or Sell!

Post by detectorman5050 » Thu Aug 30, 2018 9:04 pm

Thanks for the various replies. I've decided that I will at least try and test it out on bits of beach and field that I've covered many times before. If I come back with a reasonable number of finds from these already 'well detected' spots, then I will consider keeping it.

I won't test it around rock pools, as that is where it inevitably get covered in scuffs and scrapes. I want to keep in excellent condition in case I decide to sell it on.
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Re: 17 Inch Coil Keep or Sell!

Post by vladorado » Thu Aug 30, 2018 10:19 pm

I use the 17" most of the time. I use it with the Minelab Pro-swing 45 Harness and it makes the detector feather light. I do not agree that this coil is not sensitive to small targets. It detects minuscule pieces of metal, as long as they are not gold. It detects new £1 coin with non ferrous signal with sensitivity set at 19 (on recommended sensitivity of 14 - quite mineralised soil ) at 39 cm! It was noticeably deeper than the standard coil on the dry pastures this summer!
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Re: 17 Inch Coil Keep or Sell!

Post by Gary_Graham » Wed Sep 12, 2018 5:09 pm

I use a back pack when I'm out for the day and a bungee cord attached to the shoulder strap then hooked onto the 3030 with the 17" coil and I can go all day, no weight on my arm at all.

17" covers a lot of ground so for me it's a keeper.

I put the standard coil in the back pack and change when needed, ie long grass or woods etc.
::g
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Re: 17 Inch Coil Keep or Sell!

Post by oldartefact » Wed Sep 12, 2018 6:12 pm

detectorman5050 wrote:
Wed Aug 29, 2018 10:09 pm
I've got the 17" by 13" coil for the CTX, as part of a package. It is totally unused, and I've stuck with the standard coil so far. I am considering selling it, to subsidise the cost of the CTX.

I have used 'jumbo coils' on other detectors in the past, and they seem to only improve depth by about 30 percent on average, plus pinpointing seems to become less accurate.

My impression is that the main advantage of this coil is 'ground coverage.'

My question is, what is your opinion of the 17 inch coil? Is it a 'must have' piece of kit?
An indisputable fact is that at normal detecting speed longer coils cover more ground than shorter coils ... cant comment on depth because I dont have a masters in Physics... but if its Statistics that floats your Denarius ... then I AM YOUR MAN!!!!
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