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?
I have the AT Pro for a while now and it is very reliable. I got it just before the AT Max was released. Buddy just got the Max recently as he was using my Pro and the controls were familiar for him.
If you don't already have a pinpointer and looking for a complete package then the Max is a great choice. Depth wise it goes about 50% deeper than my AT Pro with the same size coil. That is the equivalent of my AT Pro with a Nel Big coil weighing 3 lbs and measuring 17x15". The true All Metal mode is great in open areas with little or moderate trash, Iron Discrimination on Max is better. AT Pro with stock coil hits quarters 12" or less on average on the ground around here that has high mineralization though I had picked up a Spanish Reale at 14" but it was really faint. Typically in poor conditions the Pro hits in the 10" and under range" which is average for any machine with an 8 1/2 x 11 coil
Comparing the 2 machines I think the AT Pro audio tones are a little easier to follow and notch discrimination is just a simple 2 clicks.
The Max has a threshold control that is adequate but I find the lowest tone is none and next tone click up is a little loud. That could be just my preference as I also use a Tesoro with much finer controls since it has potentiometers and is an audio only machine.
Both the Max and Pro have fairly course id blocks as compared to other machines out there and can limit discrimination but going a block under or over is not a big deal.
Learning curve on the MAX is really short, no menus to decipher through and you should be up and running in a few minutes. There are no canned pre-sets as many machines have. The AT Pro has canned Standard (noob) mode that bings on a target and is rarely accurate and Pro modes with tone roll that I ended up using quickly and found it more responsive. The Max is basically a more of a professional model of the older Pro.
I had considered upgrading my Pro to the Max, maybe next year as they are solid and reliable machines and the Max does pretty well in the Salt in the single frequency class.
If you decide to get one also consider the RnB lithium battery for them. I get over 40 hours running with no performance drop as compared to alkalines that as they wear down the machines performance diminishes. Think the rechargeable battery runs around $80.
I stumbled across a post on another forum about the auto ground balance on the AT Pro and how it is not as close to the ground mineralization as it could be. The poster suggested auto ground balancing then switching to manual ground balance and dropping it by 5 clicks.
I tried it with a couple targets on the ground, silver dime, gold earing and small white gold earing and yup gained about 2" on the gold and easy 3" on the dime. Though the targets were on the ground and not buried I believe the gain will be a bit less but the vdi numbers will be more accurate. I also tested 10 clicks down but that may be too close the grounds mineralization and the machine may start falsings. I had done this before at the beach where auto gb doesn't work that well. In wet sand the Auto Gb would set the machine around 12-14 and running the machine at 8 or gave it a bit more punch and actually ran quieter. I just never tried that on land as I assumed when the machine was quiet it was good to go.
I'm sure many of you already knew this but thought I would toss it out anyways.
I been looking for another coil for my AT Pro. I have the stock and Nel Big and find the Big coil hard to gb in most the areas around me and also too heavy. I was looking at the smaller Nel coils and see that a comparable coil in size to the Ultimate 13 is way heavier. The Ultimate weighs in lighter than the stock coil.
Anyone have opinions on it's performance ie depth and separation?
I plan on using it in open fields that have a good amount of iron in them.
So today I thought it was about time I took my 2.5 year old daughter out to my gold claim. The claim is in reasonably rugged country with steep slopes and dense vegetation. Most of the gold is found as small nuggets on or near bedrock. There was one spot I could think of that was within 100m of the road where a river bank had been washed out and bedrock was exposed. That said I knew I'd have to cut a bit of a track through the vegetation to get the little girl through.
We got to our location after a bit of a scramble down a short but steep slope with the aid of a rope. Was a bit of a performance with a backpack on my back and carrying my daughter. I set her up on a grassy bank next to where I'd be digging and surrounded her with snacks with which to entertain herself.
As luck would have it I managed to uncover three small nuggets by clearing the gravels off the bedrock and detecting it. After about an hour she'd had enough and we clamberd back to my car.
Needless to say, I'm very proud that she's now big and patient enough to take gold hunting!
Oh, we got 0.8g total. However in this case the memories (at least for me) are priceless.
I have had a Garrett ACE 250 for several years and just bought a very slightly used Garrett AT Pro a week ago. A couple of times I did not get any sound when first turned on but after wiggling the coil cable it started giving tones again. On occasion it has suddenly started chattering with almost no movement and I have done a reset and it corrected the problem. My main issue right now is that if I bump the coil cable close to the connector I get a tone every time. I have removed and re-inserted the connector twice making sure it is fully inserted but still get the tones. I have made sure its not the connector itself. I don't have another coil for the AT Pro to swap out. I texted the previous owner to find out when he purchased it hoping it was less than the 24 month warranty that Garrett has. Wondering how strict Garrett is on fixing issues like this or replacing a coil with a bad cable if I was not the original purchaser. Any suggestions are appreciated.