I have been air testing my new f75 today since it's still freezing out and for some reason even indoors it was really stable today, yesterday I could only get it up to 50 sens before it got too hot, today I had it at 85sens, disc 10, 4h. I am hitting a quarter at 14in, not a solid hit but a hit that I would dig, 12in I get a good hit on it. A dime 11in= chirps, 10in= good hits. Large cent = 15in good hit with high tone. Is this the kind of numbers you guys are seeing? It seems the key to hitting deep targets is a super fast sweep speed. This is with the stock coil BTW, I might give the 6in eliptical a shot tonight and I do want to grab a 10x12 SEF.
Find's Treasure Forums
Welcome to Find's Treasure Forums, Guests!
You are viewing this forums as a guest which limits you to read only status.
Only registered members may post stories, questions, classifieds, reply to other posts, contact other members using built in messaging and use many other features found on these forums.
Why not register and join us today? It's free! (We don't share your email addresses with anyone.) We keep email addresses of our users to protect them and others from bad people posting things they shouldn't.
Click here to register!
Need Support Help?
Cannot log in?, click here to have new password emailed to you
F75 air test are impressive!
- Thread starter 1973mach1
- Start date
like you just did, those would be typical "air test" responses.
Just my opinions, of course.
Monte
Just a difference in what the EMI source was. Sometimes conditions will be annoying and sometimes rather mellow, indoors or out about town.1973mach1 said:
Since you are experimenting I would suggest trying the other Audio Tone Responses as well.1973mach1 said:
likely similar with the same settings as you used. Naturally that would be indoors doing an "air test."1973mach1 said:
Yes, you need the best sweep speed to get the best response at the greatest coil-to=-target distance .... in an "air test." In some hunting applications you can get by with a moderate to somewhat faster sweep, but if things are against you, such as high mineralization, or trash targets nearby, a slower sweep will be more efficient.1973mach1 said:
Personally, I'd stick with the stock coil and the 6" elliptical concentric, or if you need try a round 5" DD coil. The 10X12 SEF will be heavier and won't fare as well with too brisk of a sweep.1973mach1 said:
Just my opinions, of course.
Monte
SteveP(NH)
New member
1973mach1 said:
The ground produces a signal that is many times stronger than the signal a target generates. The air does not produce any response at all. The hard job for a detector is picking the tiny target signal out from the huge ground signal. The deeper the target is and the smaller the target response becomes, and the more difficult it is a for a detector to pick out the target response. That is what separates the good detectors from the not so good detectors - the ability to pick out that tiny target signal from the huge ground signal and air tests don't do a thing to test this fundamental property of metal detectors.
Another way to look at this is that those cheap chinese Ebay detectors can all air test and great depth numbers too, but they loose a lot of their air test depth in the ground because they don't have the same superior signal to noise ratio as top detectors like the F75.
However if I ever come across a bed of coins floating in the air I will get out my F75 to zero in on them (just kidding)
I know its tough when the snow falls and the ground freezes and everyone reaches out at straws to try and still enjoy the hobby. Fortunately we have had a mild winter so far and the ground is still diggable here. Plus I can drive to the ocean beaches in about 1/2 hour and they never freeze up completely below the high tide line so I shouldn't be giving you too hard of a time. 
I hope you have detectable weather on Friday to do some detecting. I also hope you've read through the Owner's Manual to have a good grasp of all the settings and search techniques. I say this because most modern-made detectors are designed to hep deal with ground mineralization issues, and due to the ground signal effect and search coil design and such, you'll see that most suggest you search with the coil about 1"-2" off the ground. Some manufacturers even suggest 2"-3".
Personally, I don't use coil covers. For one thing they add additional weight at the end of the rod, they can be a pain in the rear to remove to clean when necessary, and since we are encouraged to search with the coil off the ground and inch or two, there's no real need for them. So, it's my personal opinion that you can forget that need and give the 6" elliptical a good testing, weather permitting.
Monte
Personally, I don't use coil covers. For one thing they add additional weight at the end of the rod, they can be a pain in the rear to remove to clean when necessary, and since we are encouraged to search with the coil off the ground and inch or two, there's no real need for them. So, it's my personal opinion that you can forget that need and give the 6" elliptical a good testing, weather permitting.
Monte