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Original f75 question

Snagglepuss

New member
I bought a used fisher f75 that looks to be in great shape me question is it really doesn't seem to lock on coins with a fairly repeatable tid number numbers bounce all over even on a shallow coin is this common I had a coinstrike which locked on coins very well.Any help would be great thanks Darren
 
Recheck your ground balance. Then try raising the coil 2-3 inches above the ground and let machine read the target again.
I've had times where the target was shallow (2-3") deep that would not ID consistent until I raised the coil a little.
Not something bad, but the machine is very powerful and can miss read shallow targets.
 
As was said recheck ground balance and speed up your swing speed. The f75 likes a fast swing speed.
 
The F-75 is a powerhouse detector and shallow coins might overload it if you do not have it set up right.
It takes a bit of time to learn how to adjust it for best operation as it is a very advanced detector with a lot of control over its inner workings.

Place some coins and other metal targets on the ground and sweep the coil about 8" above them.
Adjust the sensitivity upward and see how the detector responds to each type of target.
It is easy to have the sensitivity set too high making the detector do strange things.
If you still feel there is something not right then a trip to Fisher for a tune up might be called for.

Willee
 
Thanks for the replies ill keep working with it how much do the tid numbers usually bounce on a 4 inch deep quarter????thanks again to all with the info
 
Snagglepuss, my regular F 75 would lock on a 4" deep quarter with very little bounce. If however, the coin is on edge or somewhat slanted, then it would get a bit more tid bounce. Even then, though, the numbers were quite tight. What are your numbers range on the 4" deep quarter? HH jim tn
 
OK i got some more time to use the f75 when i was doing thee testing i just had the coins laying on the top of the ground so i took some time and berried some coins in my back yard seems like the tid numbers are alot more stable when the coin is berried.i also have to swing the f75 alot and i mean alot faster than my etrac seem everything is working as it should thanks for all the help take care,Darren
 
Mark G brings up a valid point. Due to the nature of how the DD coil is constructed, the first 3" of detection from the coils bottom can result in widely varying TID readings. This is a fairly well known characteristic with the Fisher F series/Teknetics T2 detectors. And you do need to raise the coil to put more than 3" seperation between the coil & target. I have field tested this and found it to be true.
 
Is this machines strength for fresh drops...you can quick broom a soccer field, fairground, beach, sledding hill, right after everyone leaves and really cover some real estate and stack up the finds. Or you can set it up right and look for deeper older targets too, just whatever the situation demands. You gotta get used to the tones though, like 3H, 4H, or DP. It doesn't take too long learning the tones of both trash and good targets, since you can get more hits moving quick with this unit, you will not find yourself looking at the TID much, which allows you to look downrange more for eyefinds, and signs of human activity. Tight coin spills and stacks are all over the place on the TID, but the tone will allow you to recognize something in that mess that will help you pick it apart, Strength of tone will tell you how deep it is. There is a certain speed this thing likes, too fast and you'll miss, too slow, and you wont get there, seems like sweep speed is area specific as well, chip totlots its a little slower than a wide sand beach, practice in the real world is the best, as well as coming up with a very quick target retrieval method to maximize the strengths of your machine.. HH
Mud
 
Very. very good answer Mudpuppy.
 
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