GPX 4500 - settings for High Temp amd EMI

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GPX 4500 - settings for High Temp amd EMI

Post  reasty on Sat Nov 15, 2008 6:46 pm

Hi All
Could you please kindly give me setting for my new GPX4500 as I have stepped from a GP3500 to the GPX and are having trouble setting up the unit for different conditions, would like the settings for very quite ground, setting for really high temp (40 deg plus) and also for detecting when monsoon season is around IE electrical charge from storms in the distance (5/10klms away) I have used JP's setting for electrical interferance it works OK for the storms but I though someones else may have a better setting.
Question Thanks ASI TM NOR
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Re: GPX 4500 - settings for High Temp amd EMI

Post  Nightjar on Sat Nov 15, 2008 9:09 pm

Here are settings recently used around Leonora, WA on medium mineralisation. Because of the soil variance these settings may not apply over the next hill, so they are a guide only and individuals will have to set their machine to the local ground conditions. This machine has a multitude of settings and no doubt we could have tweaked more performance if we had experimented further.
Thunderstorms were prevalent in the area but ignored the spikes. They are a good wake up call when you have been swinging without any target for some time.

Coil- 16" NF SL Mono
Front panel: Search mode= Deep
Soil/Timings= Enhance
Ground balance= Fixed
Coil/Rx= Mono

Digital/ Main menu
Backlight= Off
Battery Test= 8.0+ (Obviously this is fully charged state)
Volume limit= 9
GB Type= General
Special Extra= Sensitive Extra
Manual Tune= 124 (Depending on auto tune)
Deep
Motion= Slow
Rx Gain= 7
Audio= Deep
Audio tone= 60 (lower numbers suit hearing loss)
Stabilizer= 9
Signal= 8
Target volume= 8
Response= Normal (Couldn't come to terms with Inverted, definitely personal choice)
Tracking= Medium
Iron Reject= Off (Remember this only works with DD coils)

Instruction manual here;
http://www.minelab.com/consumer/files/manuals/man_24_1.pdf

Good luck

Peter
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Re: GPX 4500 - settings for High Temp amd EMI

Post  Guest on Sun Nov 16, 2008 7:20 am

Hi Peter,

Why do you use such a low gain setting...7?

Robert

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Re: GPX 4500 - settings for High Temp amd EMI

Post  Nightjar on Sun Nov 16, 2008 8:36 am

Morning Robert,
The combination of Gain= 7 & Stabilizer= 9 gave me a very stable threshold on this particular ground.
Leaving the digital readout on "gain," so if I heard a very slight variation the gain was cranked up to check the signal.
This particular ground is shallow so the loss of depth versus a stable machine guaranteed nothing was left behind.

Cheers
Peter
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Re: GPX 4500 - settings for High Temp amd EMI

Post  reasty on Sun Nov 16, 2008 8:54 am

Hi Peter
Thanks for those settings, just a couple of things with the settings when you say a spike may be heard do you hear these often or only a couple of times over an hour or so. I have had experiences with it every few minutes and I understand that it will happen but! I will try these setting to limit the interferance, also would you uses these settings on a fine day with high temps and very quite ground (very quite ground equals one or two hot rocks over the whole day detecting) sorry about all the trouble its just when I travel a couple of hours to the fields and get confused with the machine and start asking the question have I walked over some yellow stuff?
Thanks again ASI TM NOR
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Re: GPX 4500 - settings for High Temp amd EMI

Post  Nightjar on Sun Nov 16, 2008 9:26 am

Morning all,
First of all I must point out, I'm in no way an expert with the GPX-4500 considering have only had a week on the goldfields. My advice would be to carry your instruction manual with you and experiement with all the available settings on the day taking account of climate and ground conditions.
My understanding of the "Auto tune" is it will reduce interference from nearby man made electrical interference, micro wave, powerlines etc it will not blanket thunderstorms. Fortunately in the areas we visit we only have to contend with climatic conditions so the annoying spikes are not as annoying as the lack of gold. Laughing
The settings I have given are for the ground and conditions experienced during this time and probably do not relate to your ground. The skies were overcast and thunderstorms were prevalent the length of the state so the spikes came often, however apart from being annoying there is no way a genuine target could be missed, they can not be mistaken for a target.
Probably the only variation that will be made when conditions are fine & clear is the gain and stabilizer will be bumped up a few notches.
Hot rocks, what hot rocks? If you are getting two hot rocks a day with the 4500 it is not quiet ground. These machines blanket out ground noise and hot rocks that would trouble most other machines.
BTW did I mention, read the instruction manual. Wink
Cheers
Peter
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