General Category > General Discussion
new generation coils on gp series detectors
Joeboy:
Hi Herb,
be interesting to hear how this goes for you, nice to have more power and a smooth running machine at the same time thats for sure.
I dont have a gpx, but i just sold my gp3500 to buy a fully modded gp3000, so i cant recommend anything to you. I'm yet to test mine out using a mono, though my plan is to lower the frequency and gain to level that removes most of ground noise. Have you tried dropping your factory gain down low in relation to the var gain. i saw a youtube clip just the other day, A guy called Nenad showing some evo coils 17x13 and 19 with factory gain on 1, which was still better than fine gold or enhance it seem to remove a most of the ground noise too. Good luck with it, hope you can get it running sweet.
Joeboy
Herb:
Hey Joeboy
I'd be pretty sure the17x13 evo would be sweet on your modded 3000 and used to be responsible well behaved on my 45 before mods. It's a sensitive coil that can pick up bits almost not worth digging. It's good to hear Debongos can get his running sweet which gives me hope. Tried running factory gain 1 stabiliser 1 and could get new gain up to 1/3 but still a bit talkative. Wonder about the advice you got given about turning frequency fully clockwise on startup and if that would work with the new gain. Anyways I'm confident I'll get it sorted cheers
Joeboy:
G'day all,
Done some detecting recently with my full modded gp3000 using a 14x9 evo coil, all i can say these coils work perfectly on the gp series with mods.
I can detect gold that does not register on the scales and had to wet it to see the gold, frequency setting to max, gain 70%, Normal, sens 2, both channels used, fixed. Ran smooth only had to back gain down to half over some really hot pockets of dirt and chunks of charcoal in the round.
Happy prospecting
Joeboy.
woody:
It is good that everything is working well, I have been testing a lot of very new experimental upgrades and there is some big performance gains to be had match the coil impedance more accurately to the input stage, using a balanced input design I can just about get rid of most emi.
debongos:
Hi Herb, sorry about the late reply mate. Was out having a crack for a couple of weeks and then back at work catching up on everything that was waiting for me.
Mate there maybe considerable differences in ground mineralization between our areas. I can get the front end gain up to half way on average with the RX gain around 9-11 and stablizer a couple of notches higher again (sometimes a couple of notches lower).
When I have the coil quiet I re-check now and then with my tester to be sure everything is still working but also to see if I can crank up the front gain a little more. Obviously when it gets a little noisy I back it off a little. My failing is that I'm so keen to get going I sometimes rush through the tuning. This caught me out on the first morning of my recent trip. Geared up I moved away from the 4x4 and turned on the 4500. After it booted up and settled down I ran through the back Led settings and then went to pull my tester from my pocket to fine tune further only to discover I had left it in the car. Deciding I won't need it, I headed off anyway and after about 30 minutes of very quiet coil operation I turned the front end gain up a little. Still very quiet I turned it up more, and more until it was at maximum and still the coil hummed quietly. Sensing things were not right I walked back to the car grabbed the tester which is a 11grm piece and at only a few centimeters away the coil could not detect it. Fearing the detector had died I sat on a log and went through all settings in detail which this time around included the front switches. Thankfully I discovered I had somehow knocked it into cancel mode and therefore easily fixed. A quiet coil is what we aim for but now and then I'll try and crank it up a little to see if I can increase capacity and if its too noisy, back it off. If I hadn't done this on my last trip I would not have suspected there was a problem and could have wasted a whole day.
Anyway, there are few setting combinations to try Herb and the ground in some areas may just to noisy. Have looked at Woody's suggested settings on this site?
Cheers,
Peter
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