I have had my 800 since the end of April. I have to admit I was a little skeptical of all the hype but after using it a lot I the last 3 months or so , I am very impressed. This past Friday I was at a new site and when I picked up the detector to take it out of the truck the coil fell off. Both the mounting tabs were broken. I am pretty particular with my equipment so I really don’t think it was anything I did. I emailed the repair center and has been my experience in the past, they were prompt in their response and had shipping instructions to me that same day. They said the coil would be replaced under warranty but would take a few days because the service center had run out of coils and they were currently on backorder. This leads me to believe their must be a lot of people who have had the same issue. It will be interesting to see if this new batch of coils has beefed up the mounting tabs. They really are kind of flimsy when compared to the Explorer series of coils. I don’t mind the wait, it gives me a chance to get to know my 6 in. coil.
I swapped out my Nel Big coil on my AT Pro and put the stock coil on and just for kicks I did a quick air test to see if there was any difference and I found that the targets now hit 15-20% further away ie dime at 10 inch instead of 8.
For those that don't have Garrett machines and a 3rd party coil, the procedure when changing coil Garrett says to do a factory reset of the machine.
So if anyone knows, does using a large coil setting on a stock coil essentially do a tx boost?
Do other machines require factory reset after changing coils?
By Jim in Idaho
Finally got to work on testing the 7 1/2DF, 8x6 Sadie, MJ 8x12, and 12"DF. Did a comparison on the 7 1/2DF and Sadie with both battery packs, and a comparison of the MJ 8x12 FM, and the Whites 12"DF at 16v.
EDIT: I notice I cut off the early portion of the Miner John comparison. Hope you get enough of the sensitivity of that coil. It works very well on my SL.
I just couldn't figure it out. The old Jeep mysteriously started running much smoother and quieter and became much more stable. I would also say that it's performance somehow increased by 30% or perhaps even 40%. In fact i was so impressed i decided I would invest some time into cleaning it up a bit. As I was mucking out the interior ( forgotten rock samples, sticks and leaves, old sandwich wrappers with sandwiches, dropped nuggets and such) I found Sourdough Scott's missing ferrite ring. I took it out and put it where Scott could pick it up and now the Jeep is back to it's usual squeaky, whinny, worbally self.
I have 2 coils on my Tejon. 8x9 conentric I use in high trash areas and parks (same thing) and a 10x12 i use for woods and fields.
I got lazy and left the widescan on and hit a local park and came across bottle cap after bottle cap and could not find a good tone break to cut them out without losing too much range.
I saved a couple and tucked them in my back yard 6" down and did a quick test. I set my 2nd discrim for break on the widescan and the primary for the concentric and there is a huge jump between them. Both discrim match up on other items such as coins and rings, pull tabs.
Note that both coils actually ground balance the same and the widescan can pick up the tiniest pieces of lead and foil. I have found lead pellets from a pellet gun 4-6" down with it. I can also place a cast iron hammer head half over a dime and still hear just the dime though broken signal It's there. So I am really stumped on the bottle caps. Maybe someone here knows why.
I did a coil test some time ago using a Tdi Pro OZ, quite a variety of coils involved. Just a bit of information not wanting it to go to waste.
The test area was located in the middle of the Golden Triangle in Victoria, Australia. Looking at the images the test site is located on a area that produced large nuggets. Heavily mineralized to give the depth tests some authenticity. Targets were varied as were the coils tested. The Tdi Pro was ground balanced, gain was at 5, conductivity was in ALL, pulse delay was 10. Frequency was set in the middle and the audio was boosted by a Nokia MD-11 external speaker. Only clear repeatable signals were recorded.
All targets were buried in the ground sideway from a miners hole, so as not disturb the soil on the surface or above the target. Only the 1 grain ingot and one 0.5 gram gold coin were buried from the surface disturbing the ground.
Not sure how useful this is for Tdi SL users, deduct 10% maybe.. Just gives a sense of what is realistic is this one location at that one time with the Pro with the variety of coils available back then.
All the best, Karelian