How to master the F75 and some of its problems.......

[AndyNM]

Like you all know i was one of the first who bought a F75 and i still have it.
What really concerns me is how many F75 users complain about noise and instability. That's why i made the www.fisherf75.com page.

But for those who don't want the bus-ride to my page I'll post some things about the F75 here.

The number one problem seems to be that the F75 can go crazy and beeps constantly and the VDI numbers jump all over the place.
Well....that happened to me and my F75 too.
Nothing was wrong with the detector. You just have to know that the F75 picks up sources of interference in the high gain modes. Next you need to know what are the high gain modes.

1. High gain in DE mode kicks in if you have the disc lower than 5 or higher than 19.

2. The JE mode is a total high gain mode no matter what disc setting you use.

In a perfect world the JE mode with a high sensitivity setting would get us the best depth. Or the DE mode with the disc lower than 5 or higher than 19.

Now how do you find out if you have interference sources nearby ?
Turn on the F75 with a sensitivity setting of about 70 and lift the coil to waist level. Now select JE mode, or DE mode with the disc lower than 5. If the F75 goes crazy an interference source is picked up by the F75.

Now how do you get the F75 stable ?
1. Select DE mode AND disc between 5 and 19. Sensitivity as high as possible without falsing.


Next problems seems to be chatter from the ground.
1. Make sure with the steps above that your ground noise is not interference.
2. GB the detector using fast-grab.
3. Go to manual GB and set the number that fast grab found 1 to 3 numbers to the positive side. Si if fast grab was 60 set the manual GB to 61 to 63. That way the detector will have a positive GB offset and not give a signal to smallest changes in the ground.


A cellphone even on standby is a huge interference source !!!!

Hope that helps.

Andy,NM

 

[Tinfoil]

n/t

 

[KurtB]

n/t

 

[Mr.Bill]

n/t

 

[Andy Sabisch]

Great post and very informative . . . . useful information without a lot of personal jabs or opinions tossed in . . . this is what he forums should be about!

Solved the issue I asked and others felt the needs to criticize.

Hopefully Fisher will incorporate this into future revisions of the manual as it would have answered most of my questions

Andy Sabisch

 

[AndyNM]

I'm glad i was able to help you out this time because you helped me many times with your books on some metal detectors. (Explorer, Quattro)
Keep up the good work,

Andy,NM

 

[AndyNM]

I hope my post clears the air here on the forum and helps some friends master the very sensitive F75 better.

Andy,NM

 

[Bill Ladd]

How many of us in this day & age hunt with a cell in our pockets. I found out the hard way this was the source of my units chattering & stuff.....
(Thanks for the post...I was out hunting all weekend & missed all the fun I guess

 

[Ringzapper]

Those cell phone transmitting masts are a pain too and will cause some detectors to go unuseable within 200 yards.

 

[hoarder]

andy,
is it ok to cut n paste this information and put it on a uk forum

many thanks

mike

 

[AndyNM]

by posting just the link to this page. I would like to have the page traffic here to support the sponsors of this nice forum.

Andy,NM

 

[hoarder]

no worries i will post a link to this wonderful forum.

then they can all see the other good stuff that is on here.

 

[jbow]

I should get my F75 tomorrow. I have read through your F75 page a couple of times. I am very familiar with the T2, having used it for over a year and am excited to be getting the F75.

Thanks for you very helpful information!!!

Julien