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F75 coil
- Thread starter ken49
- Start date
Piedmontartifacts
Active member
I am still using stock 11” but I’ve only had mine for a short time. There is a bunch of coils for the 75, bel, coiltech run a few search on the net. Good luck with the new 75+.
REVIER
Well-known member
There are plenty of instances where specific Fisher coils were mounted on models they were not designed for.
I have read that there have been many different results.
Sometimes they work but not perfectly with ID's off, depth not quite where it should be.
Sometimes they really don't work at all.
Sometimes they seem to work pretty good but I did not see them compared to the correct coil to see if the performance was exactly the same.
Performance can and will be affected by frequency issues...low frequency coils on higher frequency units, high frequency coils on lower frequency units.
I can't believe that odd combinations will work optimally as the correct match and that would bother me...but that is me.
A lot has to do with what function an odd, wrong frequency coil will have in your arsenal, in my mind.
Will it be used just once in awhile, if so I wouldn't sweat or worry about perfect performance.
Is it going to be a prime use coil, if that is the plan I would definitely spend a few more bucks on the right match rather than a discounted price on a mismatch.
Again, that is me knowing I would always have the thought in the back of my mind I could be missing treasure.
Mike Hillis is a guru with several detectors and I remember not too long ago he had I believe an F5 and he mounted a 10" elliptical concentric from an F70 on it to hunt for jewelry.
It worked pretty well but once he knew it would preform the way he wanted he still went out and purchased the same coil with the correct frequency for the F5...just to be sure.
I totally got that.
These accessories we buy in order to help us find more treasure do pay for themselves in time, all of mine have, anyway.
Knowing that if I came across a deal on a mismatched coil, no matter how good, I would still stop and think hard about that.
How you think about all this is entirely up to you.
As far as that 10" elliptical concentric, (an F70 or F75 coil will both be the same),......still one of my favorite coils of all time.
https://www.findmall.com/read.php?37,2296414,2296729
I have read that there have been many different results.
Sometimes they work but not perfectly with ID's off, depth not quite where it should be.
Sometimes they really don't work at all.
Sometimes they seem to work pretty good but I did not see them compared to the correct coil to see if the performance was exactly the same.
Performance can and will be affected by frequency issues...low frequency coils on higher frequency units, high frequency coils on lower frequency units.
I can't believe that odd combinations will work optimally as the correct match and that would bother me...but that is me.
A lot has to do with what function an odd, wrong frequency coil will have in your arsenal, in my mind.
Will it be used just once in awhile, if so I wouldn't sweat or worry about perfect performance.
Is it going to be a prime use coil, if that is the plan I would definitely spend a few more bucks on the right match rather than a discounted price on a mismatch.
Again, that is me knowing I would always have the thought in the back of my mind I could be missing treasure.
Mike Hillis is a guru with several detectors and I remember not too long ago he had I believe an F5 and he mounted a 10" elliptical concentric from an F70 on it to hunt for jewelry.
It worked pretty well but once he knew it would preform the way he wanted he still went out and purchased the same coil with the correct frequency for the F5...just to be sure.
I totally got that.
These accessories we buy in order to help us find more treasure do pay for themselves in time, all of mine have, anyway.
Knowing that if I came across a deal on a mismatched coil, no matter how good, I would still stop and think hard about that.
How you think about all this is entirely up to you.
As far as that 10" elliptical concentric, (an F70 or F75 coil will both be the same),......still one of my favorite coils of all time.
https://www.findmall.com/read.php?37,2296414,2296729
Hello ken49,
Dave Johnson, cheif design engineer at First Texas, and designer of the F75 had a post regarding that. It is located on the Fisher Gold Bug/Teknetics G2 Forum, second thread down. It is titled "F-coils for the Gold Bug". Check it out, it would apply to your question.
Bottom line, while some coils may "seem" to work ok on a machine they're not designed/intended for, they may not be performing at an optimal level, and they don't recommend it.
Hope you enjoy your F75!
Dave Johnson, cheif design engineer at First Texas, and designer of the F75 had a post regarding that. It is located on the Fisher Gold Bug/Teknetics G2 Forum, second thread down. It is titled "F-coils for the Gold Bug". Check it out, it would apply to your question.
Bottom line, while some coils may "seem" to work ok on a machine they're not designed/intended for, they may not be performing at an optimal level, and they don't recommend it.
Hope you enjoy your F75!
Piedmontartifacts
Active member
Fishers website has an optional 10” concentric listed. Part# 10COIL-F70
Mike Hillis
Well-known member
Hi Revier,
Other way around. I tried the F5 stock 10" elliptical concentric on the F75. It works ok up to a set signal strength then stops. Basically you get no modulation. Bangs hard to about 6 or 7 inches then quits. The 10" elliptical made for the F70/F75 works much much better and you get the full performance value of the coil out of it. Its ok to mix in a pinch but if you want the real performance of the coil you really have to match them up.
That holds true for all the 7.8 kHz coils on the F75........except the little 7.8 kHz 4" concentric. It runs (or at least mine does) equally well on both my 8500 and my F75.
HH
Mike
Other way around. I tried the F5 stock 10" elliptical concentric on the F75. It works ok up to a set signal strength then stops. Basically you get no modulation. Bangs hard to about 6 or 7 inches then quits. The 10" elliptical made for the F70/F75 works much much better and you get the full performance value of the coil out of it. Its ok to mix in a pinch but if you want the real performance of the coil you really have to match them up.
That holds true for all the 7.8 kHz coils on the F75........except the little 7.8 kHz 4" concentric. It runs (or at least mine does) equally well on both my 8500 and my F75.
HH
Mike