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Interesting talk with our local Garrett repairman

T

TheGeorgiaCanuck

New member
Had a talk yesterday with our local Garrett repairman. He was bench testing a Garrett AT-Gold he had reset to factory specs and informed me of something I did not know. He air tested and ground tested it in his coin garden. and at factory specs the AT-GOLD gets the best depth at sensitivity setting 3, anything higher just ups the gain on objects and starts to cause sound blurring. Now this is in our soil which is pretty high mineralization. Anywhere from 74 to 86 when ground balanced.

Not sure about other places but at 3 sensitivity notches he could hit a silver dime at 10"+ and a silver quarter at 12". Just figured I'd pass this on, as I know many people run their sensitivity wide open or 2 notches from full. Tested mine at 3 notches yesterday and I was hitting rusty bottlecaps at 7-8"
 
Powerful good info there! :clapping: I've been running my Pro 2 or 3 notches below top sens and hitting deep...When I try to run any hotter, I get too much of a blurry target feedback like you said. Good to know theres power to spare if a fellow ever gets into some mild ground.
Mud
 
Now that's interesting. I've done some random experimenting, but I'm going to have to do some more controlled tests. Thanks for passing that along!
 
Could I expect the ATP to be the same G.C. ? I was running it one below or wide open in fields this spring.
 
Just to clarify, are you saying that you can detect targets deeper at 3 notches of sensitivity than you can at full sensitivity?
 
Out of curiosity did he test another ATG at the same settings to be sure it's uniform, sometimes we buy a monday build or a wednesday build or a friday build. I will definately try this setting on my ATG. That will be on sunday and I'll post the difference I see. Thank u TGC for the info.

Cheers and HH

Jon
 
Sorry I meant to add that GB here is pretty well always in the low to mid eighties, so it sound comparitive to your GB there.
 
I wasn't saying you couldn't go deeper with more sensitivity, just that increasing above 3 ups the gain on deeper objects, but also makes shallow objects sound blur louder than they should. Which can interfere with hearing the deeper whispers. But in the end it depends on your local soil conditions, trash in the ground, etc.

I'm sure I'll be running my AT-Gold at least at 5 on the scale in the long run, but since coins here are never deeper than 8-9" due to the amount of rocks in the soil; I have no reason to go max anyway.

Also I can't be sure about the AT-Pro, since the AT-Gold runs at 18khz it might be a bit different. I'll have another talk with Ed to see what he thinks. And also see if he tested on all-metal or discrim settings. I didn't think to ask that *doh*
 
This thread is giving me some thought. All who test this one way or another, I would be interested in hearing the results. Thank you, Artie
 
Threads like this help me in unexpected ways. I dropped my sens three bars and did grass strips in front of houses yesterday. Instead of the usual frantic reducing sens and or frequency changes etc. when under strong EMI, I could just keep moving with noticeable but slight signal interference. Maybe not using headphones made the occasional moderate jittering less irritating also. The point is that I am still learning this machine and it was a surprise to me that I could get satisfying depth in town without jacking the ATP to the max. I think that I have found a recipe for decent depth that allows me to ignore the much reduced EMI. Now I'm not stopping now and then to readjust for strong overhead power lines.
 
upnorth said:
Threads like this help me in unexpected ways. I dropped my sens three bars and did grass strips in front of houses yesterday. Instead of the usual frantic reducing sens and or frequency changes etc. when under strong EMI, I could just keep moving with noticeable but slight signal interference. Maybe not using headphones made the occasional moderate jittering less irritating also. The point is that I am still learning this machine and it was a surprise to me that I could get satisfying depth in town without jacking the ATP to the max. I think that I have found a recipe for decent depth that allows me to ignore the much reduced EMI. Now I'm not stopping now and then to readjust for strong overhead power lines.
Click to expand...

Now try moving it up to 4 or 5 and see if it gets too worse or not.
 
My sensitivity with either of my AT units definitely does not max out at 3 bars. I get significantly less depth with 3 bars of sensitivity than 7. I'm not saying that there aren't conditions where less sensitivity is warranted, but detecting depth is nowhere close to maximum with that level of sens. Does anyone here experienced with the AT Pro or Gold find they get the best depth with just 3 bars?

Now I've been around long enough to have seen some truth is stranger than fiction things...and an AT Gold hitting a quarter at 12" in heavily mineralized soil at 3 bars of sensitivity would definitely be one of those stranger than fiction things. My depth in my moderately mineralized soil with either of my ATs at any sensitivity can't touch what your repairman could get.

GeorgiaCanuck, you said you got this information from Ed, your local Garrett repairman. As I understand it you are in Vancouver. Does this mean Garrett has a repair facility in Vancouver, or is Ed an independent Garrett repairman?

If this story is legitimate, you should have no problem sharing this repairman's contact information with us. If he can perform the kind of magic you are describing when he brought that AT Gold up "to factory specs" then I'm sure he'd appreciate all the extra business you could send him by sharing his info.
 
I second that lets see if he can help us achive that depth are we not family...?
 
I am like marcomo and a few others. No way do I find 3 sensitivity as deep as max or near max. Yesterday one of the silver dimes I recovered ended up being right at 7" and I was running 8 sen. Before I dug it, I backed sen down to 3 and I got nothing but a tic, a tone I would have easily missed under normal swinging conditions. And that was with the bigger 11" coil. HH jim tn
 
Just speaking of my own personal experience with the AT Pro, I find "Sensitivity" plays and important roll when it comes to Depth gain or Depth loss. What I found with my Sensitivity settings, is I lose about an inch for every bar reduced from max settings.

This is very consistent with my machine when I increase or reduce Sensitivity settings (gain or loss of an inch/per bar).

The AT Gold as had some changes to it compared to the AT Pro, so I couldn't say If that would work or not because I don't have one, but it would be interesting to here from someone that does own an AT Gold to see if those settings work or not out in the field.

:)
 
Took time at lunch today to call Ed and grill him in depth. I will take credit for not asking enough questions the first time, so bear with me. I seem to have offended some people so I'm correcting my post here.


To answer some questions and set some things straight on the AT-Gold.

1. My original post ONLY talked about the AT-Gold. And after talking with him again today, it is still ONLY about the AT-Gold running in ALL-METAL mode. Nothing involving the AT-Pro, but I will answer those questions too farther down.
2. 3 notches in ALL-METAL mode is the optimum setting. 5-6 notches in Discrimination modes is recommended. Again depending on your ground conditions.
3. Ground conditions here vary alot, from heavy iron sand to deep farmland loam with lower mineralization.
4. Run your machine sensitivity where you get the best results, only testing on your local conditions will tell you that.

Answers on the AT-Pro.

1. Demo machine tested in 2010 was HOT, and deep. Unfortunately as many people found out the 1st runs of the AT-Pro had problems, from lack of depth to coil falsing and the faceplate leaking.
2. Machines where corrected and problems fixed and the machines released in 2011 and after were much better quality.
3. AT-Pro's run best at 1 or 2 notches BELOW max settings, due to the lower frequency and also depending on your ground conditions. AGAIN, you will have to test to find the optimal settings.
4. USA AT-Pro and International versions only differ in two ways. The centimeter scale on the faceplate and the lower scale high tones.



Sorry if I drove people crazy, but I shouldn't have posted till I had all the information.
 
Thanks for taking the time to get and share a more detailed report, GeorgiaCanuck.

I know that the all-metal mode on the Gold is a little deeper than the discrimination mode on either the Gold or Pro.

But 12" on a quarter in the ground with a sens of only 3 is still darned impressive. Ed is obviously doing something right.

So, again, could you please share his contact info?
 
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