7x12 N/F or 8" Commander mono

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Post  Frog on Sat Jan 01, 2011 2:51 pm

I would like to now which one of these two coils would suit my 4000 best,in gullys and bushy areas on small sub gram nuggets.I am useing a 11" commander mono at the moment what do you think.thanks Frog

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Post  Guest on Sat Jan 01, 2011 8:27 pm

hi frog, i have an 8" Commander mono on my 4000
it has good depth, picks up the smaller gold. the bit was .08grams at 2 or so inches, great for tight spots that people can't get there bigger coils into, and awesome for pin pointing the targets. i think it was worth buying it....
cheers
stoppsy

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Post  kon61 on Sat Jan 01, 2011 8:58 pm


G'day Frog.

Both coils work superbly and are pretty much on par with one another when it comes to depth and sensitivity on the 4000 for sub gram bits,but,if your talking sneaking the coil into the tightest of spots (such as cracks or crevices)or ducking and weaving through dense scrub,then the 7x12 cant be beaten.

Cheers kon61.
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Post  Frog on Sat Jan 01, 2011 11:05 pm

Thanks Stoppsy and Kon61 i tryed a 7x12 n/f last week but struggled with high voltage power lines and could not
get a accurate test in.Frog

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Post  kon61 on Sun Jan 02, 2011 12:44 am

Frog,If after auto tuning you find that EMI is still severe,try changing the coil switch to cancel and retune detector then flick back into mono mode and see if machine is more stable and quieter than before,or try performing auto tune whilst in a faster motion speed such as in medium or in fast then switch back to your normal motion settings.Remember you've also got control of manual tune + or -,after auto tune has taken place.If you still cant get the threshold quiet after all this and EMI remains a nuisance,you just might have to change to your standard DD coil and perform the same tuning procedures.
Remember that mono coils pick up 3 times more EMI than DDs do.

Cheers kon61.



Last edited by kon61 on Sun Jan 02, 2011 12:22 pm; edited 2 times in total
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Post  Guest on Sun Jan 02, 2011 8:08 am

kon61 wrote:
Frog,If after auto tuning you find that EMI is still severe,try changing the coil switch to cancel and retune detector if necessary,or try performing auto tune whilst in a faster motion speed such as in medium or in fast then switch back to your normal motion settings.Remember you've also got control of manual tune + or -,after auto tune has taken place.If you still cant get the threshold quiet after all this and EMI remains a nuisance,you just might have to change to your standard DD coil and perform the same tuning procedures.
Remember that mono coils pick up 3 times more EMI than DDs do.

Cheers kon61.


Try using a fast motion setting and a gain setting of 15. Remember to switch back to your normal settings though as Kon mentions.
It takes a bit of fiddling with settings but it can be done.

Good luck

Robert

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Post  Narrawa on Sun Jan 02, 2011 8:50 am

kon61 wrote:
Frog,If after auto tuning you find that EMI is still severe,try changing the coil switch to cancel and retune detector if necessary,

Cheers kon61.

Kon61, can you elaborate a little why you would flick a mono coil into cancel and autotune? Shocked or is this a typo?
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Post  Frog on Sun Jan 02, 2011 9:58 am

Thanks Kon61,Goldnomad i did auto tune then swopped coils and shifted to a new spot.
Not being able to test the 7x12 n/f was disappointing though.Thanks for the good advice.Frog

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Post  kon61 on Sun Jan 02, 2011 11:46 am



G'day Narrawa.

Yeh Narrawa,I should have stated,try tuning in cancel then flick back to mono and see if it makes a difference on EMI.

Cheers kon61.
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Post  Guest on Sun Jan 02, 2011 11:54 am

Hi kon61, cancel mode with a mono doe not work so what do you mean about what you told Narrawa?
Please explain?
thanks,
uncle bob. Shocked

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Post  Narrawa on Sun Jan 02, 2011 12:03 pm

I dont think its going to matter either way Kon, cancel with a mono is only really used for pinpointing large targets, or playing a trick on your mate when hes not looking. Laughing
Not to worry, i thought i may have been missing out on something. Laughing
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Post  kon61 on Sun Jan 02, 2011 12:14 pm


No your right there Narrawa your not missing out on anything and it probably wont make much or any difference to eliminating more EMI. I know you cant detect targets in cancel with a mono coil,but since cancel provides a much more stable receive field in ares of high EMI,by trying to tune in cancel then switching back to mono mode and seeing if the detector is running more stable, than from what it was when auto tuned in mono mode,might make a difference regarding EMI.

Cheers kon61.
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Post  Narrawa on Sun Jan 02, 2011 1:24 pm

As long as im not missing out on any new potential im not going to panic. lol!

Mono mode with a mono coil switches in a deep filter of some sort from memory, and it does make the EMI a little easier on the ear, but it also robs the detector of a little performance.
An easy way to test it is on a very subtle target, DD mode with the mono coil will up the response but you get more EMI, and you could up the gain to compensate for the small lose but now your EMI is back. You could up your motion but again, EMI.
I use the mono mode with a mono coil often, but when i notice things are quiet i quickly flick it back to DD. I leave my detectors menu on the gain setting where it can be quickly accessed, i autotune often especially when i change the coils polarization from horizontal to vertical creek walls. Pinching as much performance as i can as i go.

Frog, the 12x7 is a top coil and mates well with the 4000 for small gold, but the 11" mono will kill it on depth.
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Post  Frog on Sun Jan 02, 2011 1:58 pm

Thanks Narrawa i like my 11"mono i have dug rubbish down to 3 feet,just after a smaller coil to get in to those
hard to get places.
Good luck to all members for 2011 happy hunting.Frog

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Post  Narrawa on Sun Jan 02, 2011 2:03 pm

No probs, my partner uses a 14x7 NF ADV on her 4000 and doe's well with it.

Have a good 2011 all.
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Post  Guest on Sun Jan 02, 2011 2:16 pm

Frog

If its Super sensitivity you are after with at least over a foot and 1/2 of depth for tight scrubby ground covered
areas on the 4000 you would be well advised to test out the "Coiltek 10x5 Mono Joey coil".
They are bulletproof and can be pushed into the tightest spots with ease and easily lock onto the tiniest
grains of gold.
I still run one of these on my 5000 as they will get you gold on any bit of ground that has supposedly
been hammered to death many times.
Best settings i found on my old 4000 where

Set back to Pre-set first...
Front panel.
Deep
Sens = Extra
Fixed
Mono

Rear Screen.

Volume = flat out
Motion = very slow
Gain = 12
Sens = Extra
All other settings left in factory pre-set...

Take your time doing the Ground balance and only lift
the coil up n down roughly 3cm when you pump it,.
You will be surprised at the depth this set up can pull tiny bits of gold from,
my son found this 48gram specie in very tight scrub at a measured 15 inches using the 10x5 Mono
and it practicaly overloaded the machine from the signal...

7x12 N/F or 8" Commander mono CpZZ3QQtppZZ16



Pete in WA Cool

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Post  Frog on Sun Jan 02, 2011 2:42 pm

Thanks Pete the 10x5 joey sounds interesting .
Pete your replys to topics are always interesting and informative
keep them coming .Frog

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Post  Guest on Sun Jan 02, 2011 2:57 pm

Frog

Frog wrote:Thanks Pete the 10x5 joey sounds interesting .
Pete your replys to topics are always interesting and informative
keep them coming .Frog

Cheers Frog,
Just to add to my last post, the 10x5DD joey is the next step up in sens, you will lose a tad of depth
but the secret is to run it in Mono coil Mode,which switches off the right hand side of the coil
and sends and receives just through the left winding, leaving you with a 10x2'1/2 inch coil,
Same settings as the last lot but the Coil Mode is set to "Mono" not DD.
Keep in mind that your sweet spot will now be on the left side and not in the centre when using
this coil/set up...

Pete in WA Cool

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Post  Frog on Sun Jan 02, 2011 3:07 pm

Pete do you local WA folk get out for a detect over the summer months or do you have to wait until april may.Frog

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Post  Guest on Sun Jan 02, 2011 3:17 pm

Frog

I personally try to get out any time of the year as my work routine only gives
me 4 weeks a yr leave, so even if i can get out for a day which means minimum 4 hr drive
for 4 hours on the gold then thats all good with me, its usualy southern cross or paynes find
but i do ok on these fields usualy with a quick half oz for the day most times.
When i do hit those fields i do run the 10x5 Mono as those areas have had a good bashing
and most if not ALL of the bigger nuggets are gone, but when i go further out i always take about
5 assorted coils from the 10x5 up to 24x14 with me for the bigger stuff on deeper ground..

As to the other operators over here, most of the folks that actually live out in the goldfields will
detect all year because they are used to the flamin heat and they can grab a session early in
the morning and late arvo through until 10-11pm maybe with a night light on the cap..


Pete in WA Cool

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Post  Guest on Tue Feb 08, 2011 10:59 pm

Hi Frog, not sure if you've chosen your coil yet, but if not, just to make your desision a tad harder, there's also the Coiltek Platypus which is worthy of concideration.
It's 11.5" x 8.5" and also fully waterproof so absolutely no worries about poking it in creeks and rivers.

These new Platypus coils are designed specifically for the SD through to the GPX series of detectors, priced very well and I'd seriously be giving one a look over if I was after a coil in that size range.

Cheers!

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