some F75 questions

[Neil]

First off all Ive done with this so far is ocean beach hunt, dry and wet sand. GB comes in around 35 on the dry sand and averages about 10 on the wet sand.

A couple of things Ive not figured out yet: occasionally a plus sign comes up on the screen when I get a signal, any idea what that means?

Something else is I will get a weak signal and no ID at all, and Ive dug a bunch of these and always there is something there, its not falsing, just like its to deep to give any kind of an ID?

Small iron fools me still with those 7, 8 and 9 ID readings and yes you have to dig those if you want the smaller gold items, Ive already checked against my gold. any tips on that would be appreciated.

I mostly run in all metal since I like it to be as hot as possible, as deep seeking as possible. dry sand I can usually get the sens to about 80 and its pretty smooth and wet sand Ive got to back down to between 60 and 70.

I like the speed of the machine between targets, the excellent ID, the backlight feature, the light weight and the multiple ways you can set it up.

I dont care for the grip which cramps my hand, I think a straight grip would be better and honestly think that will be a nightmare when I have to start wearing gloves once the weather gets colder. I also dont like that it takes two hands to adjust it and would much rather see some touch pads, something to make shifting between modes or making any adjustments a simple one handed operation.
Also, does anyone know what is the point of not being able to fastgrab GB below 40? Its a feature I cant use on the beach.

I have made some very deep finds with it. No gold yet but from the deep tabs and foil Im digging I know it will be excellent for jewelry, which is why I bought it.

Thanks much,
Neil

 

[XLT-user]

The detector is Manley a inland detector. So the low 40 is within the range on inland grounds. FT put the full manual ground Gb on so you can hunt everywhere. As you know in salt it's critical getting Gb just right. Hence the manual full range GB. On Gold fields you may need a little positive..Well thought out Gb system from FT Fisher. And even though it's Fast Grab it's not auto adjust. Much better having manual Gb for all situations than tracking that does not usually work properly..The tracking machines never catch up..

 

[EZrider]

All i can think of when reading this is everything Nasa Tom talks about "soil matrix" also the tech article in the new e&w treasure magazine. Neil, your hunting one of the most volatile soil conditions known to a detector. Salt sand beaches play havoc on a signal frequency detector. The 75 can handle it as i had to go prove it to myself. But it isn't a wet salt sand machine. Two hands to adjust? i don't get it? I just use my thumb to push the button and scroll the knob.

 

[vlad]

n/t

 

[Neil]

Hey EZ your right. Ive been holding the pushbutton for manual ground balancing and I didnt realize I could release it. That would give it a one handed operation indeed

Several single freq machines work well on wet salt sand but none have any form of ID so that puts this machine as something I had to try. I know I loose a bit in the wet sand but make up some again in the dry sand, and I hunt both depending on the tides.

Any comments on how to ID the small iron pieces as iron so I can bypass them?

Thanks much,
Neil

 

[Neil]

Hey,

Thanks and yes Im aware that its mainly a land machine.

Any comments on small iron ID?

Thanks,
Neil

 

[EZrider]

If the small iron has the same conductiveity as small gold there isnt much you can do. Rusty iron will bounce and sometimes high tone "high id in AM". I dont really have enough time on the beach with the 75 yet.

 

[Neil]

Hey Vlad,

Ive dug some small bits and pieces of aluminum in the wet sand at decent depths so I know if I come across a small gold chain or similiar small gold this will hit it. Its good to see it works this good in the wet sand, and I think its really got some potential in the dry stuff, real potential there.

HH
Neil

 

[vlad]

Either get on the beach, wet or dry, or knee deep-that ankle deep water will give you fits.

 

[vlad]

to lift your coil, like in the days of the TR, but scanning to and fro will cause iron i.d. to change a lot,
while conductive will stay the same.

 

[vlad]

If you are in the water at say knee deep, it works fine. Even dual frequency units have fits
at ankle deep slosh. [The 1280/HH at 2.45 VF are SUPERB in salt.]

 

[LiL-John]

Hey Neil Did any one ever answer the reason for the + sign that every now and then shows up in AM?

 

[Neil]

n/t

 

[Sunny Jim]

Howdy!!

I have had the plus sign too a few times and do not have a clue as to why. Small Iron is a challenge, I tried to work out the kinks by using a small coil for training and watching the iron meter (FeO). Low numbers from maybe 6 on up depending on the depth, size, etc. with no iron in the FeO is a good target. Lower numbers than 6 seem to be Iron for sure. Try swinging from different directions and look for a consistant number grouping around the same value at all angles. The FeO meter and the small coil helped me to get better at not digging iron targets that could be gold. Try some split-shot for practice.

"Some times the pot o' gold is something else"
Sunny Jim

 

[XLT-user]

The only plus and minus signs on the machine apply to either

Threshold, or Audio Pitch


Threshold -9 to +9

AP...-9 to 9

Daniel at First Texas has had one other machine returned for the + sign showing up..It does not effect the detector.

Like any computer you get little odd ball things occur once in a little while...Maybe some outside electrical interference caused the computer to flash your positive signal momentarily. Fisher service could not get the detector they had returned replicate the problem.

 

[vlad]

n/t

 

[jim tn]

Mine, too, will occasionally show a +, but it usually occured when I was sweeping over a big/heavy piece of iron. And, that is what I assumed caused the plus. What ever the + is, it's not a problem HH jim tn

 

[XLT-user]

It does not present a problem for the operation of the machine...He did state if sent in to Fisher repair, software could be re calibrated, but then your machine would not be + or - within specific tolerance calibrated for the coil on your machine.. he said they had a plus and minus toleration dedicated to software on machines at the time of assembly and set up..If re calibrated it may not be within those tolerances and depth could be drastically affected with other things.. So I would leave it alone if your machine is deep, and works well.. It just might come back an average detector. Again, not my words..Daniels at First Texas Fisher division tech department. 5/12/08

 

[Sunny Jim]

Mine is deep! No worrys here mate!

thanks

 

[jim tn]

n/t