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F75 thoughts

E

Elton

New member
I would like some serious input in the operation of the F75.
#1. Just got it last Thursday..Supposed to be upgraded unit.What does that mean ??
#2. Ony used it a couple times while on the road for my job.... Not a lot of experience !!
#3..Pinpoint and depth mode..Mine tends to read 5 " on just about any depth most of the time..Normal/or/Not normal
#4. Constant chatter or target responses ( Not sure which it is) when Sens. set 50 or above in DE mode--------Only mode tried so far
4A..Is this normal, or is this a problem machine ?.
#5. Where is the pinpoint detect area supposed to be on the coil....Middle , front , rear..Where please..??????
#6. Impossible to detect in a park with a little to a lot of trash..Constant noise all the time. How do you set it up for Park hunting???
#6. Contacted Fisher via e-mail - Appears they do not care..No response in three days now.
#7. Almost forgot..when discrimination set up to 25 seems to intesify the chatter, and not quiet it down like I thought it should...any thoughts on that ??

Now final question-- What is a good F75 supposed to do on depth. How is it best to operate the unit, and, if this seems not right what I describe,, can you please specify how it should be acting, and ,should I get a replacement machine if they ever contact me.....Maybe I should have bought the SE like I was going to do...So far not a happy F75 owner/ But I am inexperienced with it, and realize it could be me, and not the machine.I will await your fine responses, and I hope there are many....Straighten me out before I make another huge error with this thing.. Or contact me if you really want a .......oh never mind, I am just aggravated.My first thoughts was it was an ok machine, but after trying different areas..well I am not so certain now !!
 
1. Envromental upgrades, its a better sealed unit.
2. Make a teast bed at home and bury coins at diffrent depths.
3. Its targets and its normal. If your getting EMI thats a diffrent topic.
4. Pinpoint is between the shaft and dot on the top of the coil.
5. By noise you meen signals?
6. 6 and below or 25 and up it kicks into a high gain mode.
7.All pro grade machines will be like this. You just have to learn what the machine is doing and understand how to set it up. Do alot of reaserch and read every post about it. There isnt one magic setting that works for everyone. you have to understand what the settings do and set it up the way you like it. There are many factors that people encounter, gound balanceing, sens up to high, improper discrim and notching etc.
 
Hi Elton.

Do this inside your house with some stuff turned on, like maybe the TV and a ceiling fan on low, and the lights on.

Do a factory reset. Then raise the sens to 90 and hold the coil up in the air away from any metal. If it chatters like a banshee you have a problem. If it stays mostly quiet with only an ocassional chirp you have a good machine. If it is behaving like it should you can drop the disc to 0 and stand it upright with the coil in the air (upside down) and still have a mostly stable machine.

Now take a quarter and hold it about 1-1/2" to 2" above the coil. The thing should go nuts. That is because you can't hold the coin still enough. The F-75 is hitting on every little movement. Thats how fast it is. Now move move the quarter away from the coil until you find the distance where you only get a response when you deliberatly move the coin. When you get into a site that chatters like a banshee you will need to hunt with the coil raised at least to that height.

Once you get that straight in your mind it will go easier.

HH

Mike
 
Worked like a charm..all as you said, no chatter in air..Quarter 2 inches went nuts..Thanks for that tip..man maybe it's just sensitive beyond belief
 
Absolutely..he is doing everything humanly possible for helping me get it right..I just knew there were some Very good Fisher operators out there who are in the know. I knew the answers were available and would be very helpful to a newbie with a Fisher F75.. The F75 is a little over whelming if you haven't used one.
I certainly appreciate any and all input...
 
Yes you said it best..The F75 is sensitive beyond Belief..and faster than a speeding Bullet..I have found that a good quality set of Headphones are a must.
Congrats ..Wait till you start finding coins on edge.It picks up the Tiniest targets..
 
[quote Elton]I would like some serious input in the operation of the F75.
#1. Just got it last Thursday..Supposed to be upgraded unit.What does that mean ??
#2. Ony used it a couple times while on the road for my job.... Not a lot of experience !!
#3..Pinpoint and depth mode..Mine tends to read 5 " on just about any depth most of the time..Normal/or/Not normal
#4. Constant chatter or target responses ( Not sure which it is) when Sens. set 50 or above in DE mode--------Only mode tried so far
4A..Is this normal, or is this a problem machine ?.
#5. Where is the pinpoint detect area supposed to be on the coil....Middle , front , rear..Where please..??????
#6. Impossible to detect in a park with a little to a lot of trash..Constant noise all the time. How do you set it up for Park hunting???
#6. Contacted Fisher via e-mail - Appears they do not care..No response in three days now.
#7. Almost forgot..when discrimination set up to 25 seems to intesify the chatter, and not quiet it down like I thought it should...any thoughts on that ??

Now final question-- What is a good F75 supposed to do on depth. How is it best to operate the unit, and, if this seems not right what I describe,, can you please specify how it should be acting, and ,should I get a replacement machine if they ever contact me.....Maybe I should have bought the SE like I was going to do...So far not a happy F75 owner/ But I am inexperienced with it, and realize it could be me, and not the machine.I will await your fine responses, and I hope there are many....Straighten me out before I make another huge error with this thing.. Or contact me if you really want a .......oh never mind, I am just aggravated.My first thoughts was it was an ok machine, but after trying different areas..well I am not so certain now !![/quote]

This song sounds familiar! LOL
 
Hey Elton, welcome to the F-75 family. As you probably know by now, it is not an X-Terra. The 75 is one powerful machine and has to be run and respected as such. Keep it in the Factory Pre-Set for the first 5-6 hunts until you get used to the signals. It is still pretty sensitive in these settings and it falses more than the X-Terra but you will soon be used to the sound of a good target. Keep the Disc. between 6 and 19...above and below that setting, it's in a High Gain Mode. I haven't gone out of that range yet but I have cranked up the Sens. I have only about 10 hours on the machine, so I'm not quite ready to give much advise. All I can say is that the machine has plucked out targets in places that I thought were sanitized and I am using only half it's power. Stick with it and try not to get frustrated, it's a short learning curve, much shorter than the Explorer SE and it's much lighter.

Check out this site fisherf75.com this guy know's his stuff. Also go to the TD Fisher site, as the F-75 is spoken there. Good luck and you can PM me anytime and maybe I can give you a few more tips as I learn it a little more. BTW, I still have my X-70 and when the newness of the Fisher wears off, I'm sure I'll pick up the Minelab again for cellar holes as I haven't got the small coil for the Fisher yet. Good luck, Ron
 
When I did your air test with a quarter, it got lost at 5 1/2 inches!!!! FIVE AND ONE HALF INCHES! My MXT did better than that.

Also, the numbers jump around depending on where the coin is picket up on the coil. A penny reads anywhere from 58-75, a nickle 23-36, a dime 71-93 and a quarter anywhere from 83-90.

Given the above info, is my machine acting like yours and this is the best it is going to get?

My newer XT-70 backup machine does only a little better on the air test (much to my surprise), but it locks on hard to the coin without jumping around which gives me great confidence to dig or not to dig.

What do you think based on your experience?

Thanks.

Marke
 
Marke,

If your machine is stable in the air with a Sensitivity setting of 90 with a disc setting of 10 inside your home you have a good machine. If it fails this test you need to send it in to get it fixed.

If you get chatter once you pass a sens setting of 90 that just means you have a LOT of EMI going on and is no indication of a malfunctioning machine. Same with a disc setting below 6. If you are stable in the air at 90 and 10 you have a perfectly functioning machine.

Regarding air test depth, is your machine stable in the air at a disc setting of 0 with sens setting of 90? If it is stable at 90 and 10, but unstable at a 90 and 0 setting that tells me you have a LOT of EMI going on in your house and that will affect your air tests. The fact that you are getting about the same results on a couple of different machines tells me that this is what is happening.

Regarding bouncing numbers, you cannot physically hold the coin in the same position and sweep it. The id number will change as the angle of the coin changes. Tape it to a yard stick and swing the yard stick like a detector over the coil. Not only will you get better numbers, you will also be able to more accurately simulate various sweep speeds. Your Xterra doesn't have near the discrimination spread of the F-75 and will appear more stable for id number, but that is just because it doesn't have as wide a discrimination spread.

HH

Mike
 
Mike, I reset my machine inside my house, turned the disc to 90 and my machine went crazy, so I guess I have a bad machine. What do I tell Fisher when I send it back?
Thanks.
 
[quote f75usr]Mike, I reset my machine inside my house, turned the sens to 90 and my machine went crazy, so I guess I have a bad machine. What do I tell Fisher when I send it back?
Thanks.[/quote]
 
If your machine is going crazy at 90 sens inside the house its EMI. I get the same thing but wireless routers, computers wireless phones etc. Out at the park i can run 99 and its rock soild. No falseing, No chatter.
 
Repeat the factory reset and raise the sens to 90.

If it is chattering like a banshee at that setting something is wrong. Lower you sens until it stops chattering. Then call Fisher, ask for Felix and tell him you think you have a shielding issue with your machine. Tell him the sens setting where it stops chattering and ask for a RMA number so they can check out the machine.

Regards,

Mike
 
As Elton's dealer, I have talked to him via the phone and by emails. I contacted Fisher and got him a Return Authorization for his F-75 if he chooses to send it in..... BTW, if you need any Fisher serviced, call the factory and ask for the service department. The Gentleman there who handles the phone calls is a great person to deal with who knows Fisher detectors well...Best to all, Richard
 
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