LTD Air Test

[markg]

My LTD air test the following items at sensitivity 80, discrimination 6, 4H and BP (boost) mode.



Silver

Dime at 12

 

[rick in mi]

My results where not as good as yours markg,but then I have never done an air test with any of my machines before,and I found there to be some variables envolved in this type of test.Laying horizontaly the coil should be at 90 deg.And I also noticed the placement of the coin in relationship to the proximity of the coil,in other words it pretty much tells you where the 'sweet' spot of your coil is.I found this very interesting!!
sens 80,disc 6,notch 1,tone 4h,proc bp.Then I lowered the sens. as you did,leaving the other settings as is.
dime 81/4
quarter 9
dollar 12 1/4

dime 6 1/4
quarter 7 sens.40
10 1/4

dime 5 1/4
quarter 6 1/4 sens. 20
dollar 7

hh rick in mi.

 

[Elton]

n/t

 

[Roland58]

I find this thread most interesting, as I have the standard F75 and have dug a 9" clad dime and an 11" clad quarter (my deepest coins). These measurements may not be exact, but, they were determined by my digger and are pretty close. Do the machines pick up better in an air test or with some moist dirt in the way?

 

[rick in mi]

I should have mentioned I was using the 11" dd elliptical coil. I did this test outside in about 45 deg. temps,if you think it makes a diff Elton. I think this is more of an observation then a test Roland,I dont know how markg measured this "air gap",though my method was rather crude. I simply marked two inch increments on a string with a sharpie then tied it to my coil !!! Thats when I realized the diff it makes where the coin is placed under the coil,as I had the string tied to the right side near the toe of the coil, as I moved the coin more towards center the signal was stronger,therefore I could move the coin further away from the coil and gain more depth,but..the accuracy of my measurement suffered....hh rick in mi.

 

[mascard1]

My LTD air test the following items at sensitivity 80, discrimination 6, 4H and BP (boost) mode.



Silver

Dime at 12

 

[markg]

Updated findings, and keep in mind this is just an air test.

Dropping the discrimination to 4 added from 2 to 3 inches in distance for the air test. Interesting note though. When the sensitivity was below 30 I found no increase in air distance. Second using sensitivity of 80 disc 6 is about identical to sensitivity of 40 disc 4! In my hot Virginia ground this might be a benefit because a sensitivity of 80 is very hard to obtain and maintain, just to much noise.

 

[iskirkra]

Mark, I am getting about the same depth readings as you. After reading your last post about the depth gain at disc = 4, I remembered that if the discrimination is between 5 and 20 you get lower sensitivity so I tested at disc = 21, bp, sens =80 and got the added depth that you experienced when moving the disc to 4. I sometimes forget how you can use the below 5 and above 20 discrimination settings and lower the sensitivity without loosing depth.

 

[widebody]

b][size=large]in response to roland. i believe the dirt offers mineralization thus resistance. you don't have that in an air test. i ain't been doing mding very long myself. just something i thought i had learned.

HH[/size][/b]

 

[markg]

So very correct, the ground changes everything, unless you're in Florida where the ground has very little if any minerals.