F75 tips & tricks, Best settings.

Author. Errol Belda

Wednesday 02, 2016



The Fisher F75 is a great metal detector for the price range, It is one of the fastest metal detectors on the market, Offering great performance in highly dense iron infested areas, Picking up coins and the desirable targets instead of the iron trash. With a lightweight easy to swing design, It allows you to cover more ground with confidence.


What are the best settings to start with on the fisher F75?

Start with DE mode, Disc at 10 and then ground balance and set the sensitivity at 60 and start to get a feel for the ground and conditions and then adjust sensitivity up or down to suit the situation.

Another common question-problem I hear with the F75 is “I can’t get the F75 to work at the beach, Without being incredibly noisy?”

A: First you need to know that most beaches ground balance under 40. That means you can NOT use fastgrab. You have to use manual GB to balance to ground under 40. To avoid reflections from the salt use the DE mode and lower the sensitivity (Not JE mode because the gain is to high for salty ground). Q 8. Even in DE mode the F75 is very unstable and noisy. Why is that ? A: If you set the Disc lower than 5 or higher than 19 the detector runs at a higher gain in DE processing. That higher gain means more depth in interference free and mild ground areas but if interference or bad ground is present the detector becomes noisy and unstable. For best stability run disc between 5 and 19 in DE mode. Reduce sensitivity too if needed. The JE processing mode has a much higher preamp gain than the DE mode and is very sensitive to interference sources like cellphones, lightbulbs, power lines. If the detector goes crazy in that mode go back to DE mode and set Disc between 5 and 19.

Here are some great field test reports about the F75 

F 75 Field Test Report by Mark Gillespie


"To begin I’d like to explain a little about why I wanted to write a review of the F75. My first detector was purchased by my wife in 1980. As most well know, the machines back then, had very little depth and hardly, if any, discrimination. Since that time I’ve owned three other detectors from two different manufacturers, not to include my present Fisher F75. Being a procrastinator, (in the biggest way) I’d dragged my feet for over a year before choosing the F75. I had read every article and review that I could find before my purchase in March of 2009.


After buying the machine from Badger Metal Detectors (Gene Scullion) I was extremely excited when it arrived. One note worthy quote that Gene stated after I bought the F75 was “you won’t look back.” This was because he was using the same machine that I was prior to switching to the F75. Nope, I never looked back. I could hardly wait to try it out in my test garden where I had many different coins and trash buried at different depths. Now you might be wondering why I was so excited about the test garden. Well, to be truthful, it was because many of the coins had vanished from detection by the other machines I had been using.


Practically running out of the house to the test garden, and knowing the dime was the smallest coin planted there, I had to try it first. My anticipation and excitement was high when I turned on the machine for the first time. I left all of the settings in default and swept over one of the undetectable dimes and “BAM” the F75 acquired the dime with no problem. I could not believe what I was seeing for a few moments. The dime was lying flat at only 6” deep. I was well pleased and my confidence was high from the very start. As I moved to the other hidden targets they were also easy to detect. Each gave away their location with very little effort on the part of my new machine. Now, a little history about the garden will help to understand my feelings. About two years prior, I had planted the garden without cleaning out all junk and iron targets first. It just so happened, the area was riddled with nails and other typical barn yard material. Shortly after burying the targets, a couple of good soaking rains had caused some of the coins to vanish from detection (by my other machines). With my confidence high I headed out to the areas where the other machines had given me so much trouble in the past. My first stop was a local community center where I had found a silver dime about a year before. There’s also a story about this dime as well. It was only 2” deep and laying flat.


The machine that I was using at that time was not a slouch (I had dug nickels at 7+” before), but was actually one of the best relic machines around, but it only gave a very low volume beep over this target. Thinking it had to be a deep target I dug a 6” plug just to find the dime in the top two inches of dirt. This particular find got me to thinking about why the machine only gave a faint signal. At that time I really didn’t think masking was a factor in the areas where I hunt so I sent the machine in for a tune up because of the very low volume beep on the dime. Two weeks later, the machine came back with a clean bill of health, but I have not forgotten that day. I really felt the area should have more goodies, but couldn’t seem to acquire them with the other machines. Well, anyway, I returned to the same area where I had hunted with the other machine, and within a couple hours had 2 silver dimes, 1 silver war nickel and 2 wheat pennies, not counting the regular clad coins. A few days later I had an opportunity to hunt at an old school that had been shut down for about 40 years.


This is where the F75 proved to be a superior coin and relic hunting machine. This area was covered with old rusted nails and miscellaneous metal parts. Hunting was more difficult because of the many targets in the ground but three hours later yielded 2 Indian head pennies, 1 wheat penny, two buffalo nickels and an antique green stone ring. At this site I was utterly amazed at how fast the machine could sound off on the different targets. I remember getting a good signal, pinpointing what I believed to be a good target and after digging a nice plug 5” deep only to recover numerous nails from the same hole. All the time thinking I had heard a good target for sure, I continued to dig until the Indian came to light. Then I stopped and thought for a moment about what I had just witnessed. There were at least 3 nails in the same hole where the penny was, talk about iron see through, the F75 saw the penny through the rusty nails. After a couple weeks of successful hunting I decided to head out to one of the local schools to do a little coin shooting. Okay you might say, “What’s the big deal with coin shooting”, Oops! here comes another story. This particular school has the most difficult ground in my area to metal detect. I have hunted it for several years with very little success.


Up until now, I didn’t have a machine that would analyze the soil and give me information about the ground minerals. The FEO meter on the F75 revealed to me the severity of the dirt (FEO maxed out) I was trying to hunt. I took a small magnet and rubbing it over the ground revealing small BB size pieces of coal cinder waste that stuck to the magnet. I posted many questions on the internet with no insights as to what to do. Finally I decided to try the motion all metal function. Basic AM setting wasn’t quite what I had hoped for so I experimented with the threshold setting and finally settled for a -2. My final settings were, threshold -2, sensitivity of 80 and a little positive on the ground balance (actual GB was 80 so I set it to 82) and the machine settled down and I began to hunt. I headed to an area where I had previously hunted many times with my other machine. I felt this area was very clean and wasn’t expecting to find much, but was I wrong. Within a few minutes my first 10K gold wedding band came to light. The finds that followed, were a silver quarter and 5 old rings (nothing high dollar) I had missed with the other machines, all within a 30 square foot area. The all metal mode allow me to detect deeper than regular discrimination mode, which was proven by one ring that was a solid 7” deep. Now to drive home the fact that the all metal mode was working correctly I switched to a simple discrimination setting of 6, sensitivity 80, DE mode and 2F tones to find the target response became broken and only a two way response at best.


The TDI numbers bounced from low to high in discrimination mode but were very stable and consistent in the all metal mode. To finalize my review I’d like to tell you about my trip to Holden Beach North Carolina. Prior to my vacation I had read numerous articles on beach hunting. You know, things like how, where and what to look for in both dry and wet salt sand hunting. Armed with many ideas, I spent close to 15 hours experimenting and adjusting in all metal and discrimination modes. My final settings in all metal mode, were, a manual balance of about 1, sensitivity of 90, threshold of -2. I dug many coins in the 4-6” range in the wet salt sand areas. I was quite surprised at not finding nice jewelry, but an elderly gentleman of 84 told me the beach officials had just added about 18” of fresh sand on the beach after a bad storm earlier this year. But I did prove the machine has the capability of detecting a coin at 10” in the wet sand area.


While I was there my son-in-law and I made a very simple video of the F75 performance in the wet salt sand. This video can be found on you tube under the name of “Wet sand testing the Fisher f75 at Holden Beach, NC. “ I could go on and on about what I’ve found since purchasing my F75, but as a final note, I would like to say I have found more silver in the past 6 months than the last 5 years combined with other machines. My first Indian head, V nickel, Barber dime and 10k gold wedding band were found with the F75. Recent release of the new F75 LTD will probably prove to be an outstanding detector as well, given time to learn and experiment with the endless possibilities of buried targets one might encounter. My area holds three different ground problems and the F75 has adapted quite well for me to hunt. Fisher has and will continue to strive to provide the best possible machines in the metal detecting world. The F75 is far superior to the other machines I have used in the past and I can say for sure, if a person wants to take the time to learn the machine, it won’t let them down."



"by Gene Scullion Badger Metal Detectors Madison, Wisconsin



It’s not often a new machine gets my attention very quickly. I usually watch and wait for the reports, read the forums, listen to the feedback, and talk to the new users. I am comfortable with the small arsenal of machines I currently have and I was in no hurry to purchase a new F-75, but sometimes fate has a funny way of changing ones plans. I was invited to hunt with a friend at a military site, and I took my normal relic machine while Mike Scott brought his F-75.


I was looking forward to being able to compare targets with this new machine, and see how it stacked up to my machine. As luck would have it we were not always within earshot of each other, but both machines easily registered the targets we did compare.


Nothing significant was determined and certainly nothing indicated to me that this new machine was any deeper than what I was using. This particular site was covered with a lot of forest clutter. The ground was covered with broken branches and tree limbs and other debris. So much so that we would rake an area clean and then detect it. I had cleaned off a new area about 20 foot square, and was the first person to really hunt this particular plot of ground carefully. The targets were numerous and I was very excited to be doing so well.


Mike was re- hunting areas already covered previously, preferring to hunt the areas that had already been cleaned of debris. I finished my area after several hours and began to move to adjoining spots when Mike announced he had to leave for several hours, to attend a previous commitment. We both had thought we would call it a day at this point but because of the success we were both having neither of us really wanted to leave. He wanted to come back after his commitment and I certainly wanted to continue hunting so it was an easy decision. He said he would leave his F-75 for me to use, if I wanted to try it.


I was somewhat apprehensive, yet mysteriously excited to be able finally try this new machine and I certainly didn’t want to leave this awesome site! It didn’t take much convincing to get me to try the F-75. My first thought was that I really would not know what to listen for or how to operate the unit effectively. I certainly didn’t want to handicap myself at such a great site but Mike had everything set on the F-75, all I had to do was hunt. After a quick lesson Mike left and I was on my own. I wandered around, trying to get used to the signals I was hearing, and I must admit I was a little frustrated at first. But within 15 minutes I could tell good from bad targets and after digging a few good buttons I was gaining confidence fast. It was then I realized that what I should be doing is hunting the exact 20-foot area that I had just cleaned out with my other machine. What better way to see if this machine was any better than my detector? I had a cockiness of attitude, believing I might find a few targets my machine might have missed, but I was sure I would not be too surprised.


Well, slap me and call me “Shirley”! I spent the next two hours digging target after target in the area I thought I had worked pretty good. I was shocked, surprised, and a bit stunned. How could I have missed so many targets? None were extremely deep, that I recall, but nonetheless, I found half again as much as I had on the first pass with my other machine. I am not a sloppy hunter, I carefully grid my areas and work them carefully, then turn at 90 degrees and work the area again crossing over my previous grid a second time. I may have missed a few targets during my initial sweep using my detector, but certainly not that many. I could only come to one possible conclusion: the F-75 smoked my other machine. Try as I might, I could not justify things any other way. After several hours, Mike returned and I relayed my experience to him. He just smiled, having experienced the same thing himself when he first started using the F-75. I reluctantly handed the F-75 back to him, and we both continued to hunt this site for several more hours. We both continued to dig targets, but I couldn’t help but wonder what targets I was missing. I am certainly not going to cast aside my favorite machines because of this two-hour comparison, but it convinced me that I need to investigate this machine more.


As a dealer, I need to learn this new machine so I can better service my customers. As a user I need to learn this machine to see how well it does on the sites I normally hunt, under the conditions I normally hunt in. Only then will I decide if it’s better than what I am currently using. When I finally received my F-75 I opened the box and was a bit surprised by the “Read This First” instruction page taped to the bag that contained the control housing. Wow, Fisher is actually warning its users that the machine is very sensitive and explains the basics right there on the very first thing you see when you open the box. I then set the manual aside, and quickly assembled my new machine. After all, I am a veteran detectorist; I should be able to figure this machine out without having to read a manual, right? OK, I was a bit mistaken on that part but the actual operation of the machine IS very easy, with only two controls needed to make every adjustment possible, and an on/off/volume control.


I must admit, I was impressed with how easy the F-75 was to adjust and move around the menu’s. It is very straightforward and easy to understand and adjust. What is not so evident is what some of the screen abbreviations stand for, so eventually had to open the manual to figure what “bc” and “pf” modes stood for. That said, I realized there was more here than meets the eye, so I sat down and read the entire manual. I had a general idea of how this machine worked because of my early experience with Mike’s machine, and I spent several weeks reading “Fisher” forum site posts and contacting several other people I knew that had already traded their old machines (the very one that I have been using) for this new F-75. I gleaned a few secrets and suggestions, and re-read the manual again. All of this occurred during my early hours of using the F-75.


I instinctively thought that I should crank the sensitivity, you know, to see what the machine could do (in spite of what the manual instructs you to do), but I quickly learned that is not the approach you can use with this machine. Like other really sensitive machines, one must temper your belief that “more is better” and really follow the instructions in the manual. You really need to run the sensitivity as high as you can, but still keep the machine stable and relatively quiet. That may mean turning the sensitivity down but on this machine even “low” sensitivity can be much greater than what you are used to seeing on other machines. Trust me on this, pay no attention to what number setting you have it on, run it where its smooth and quiet, at least until you learn the machine and have a few hours under your belt. At some sites you can run it higher than at others, it depends on the conditions and interference encountered. Let the machine dictate where you set the controls so it runs smooth and quiet. My primary passion is relic hunting so my observations will revolve around that aspect of the hobby. From what I can tell this machine really is a jack of all trades, good for relics, coins, beach hunting, gold hunting, it does it all.


Reports posted on some of the metal detecting forums point this out as well. I will save all the boring details about the sites I visited, but they are sites that I have been hunting for years. Some I consider “picked clean” and rarely find targets any more. Others still give occasional goodies, but its getting harder and harder to make finds. I have several ghost town sites that now consist of crop and grazing lands, a stage stop site, and of course one military site. Each site I took it to I was able to detect some targets. At some sites I was pleasantly surprised, and at one site I found virtually nothing. At one ghost town site, I found a toe cleat, spoon parts, several musket balls and a small button, and a number of pieces of lead splash. I was mildly impressed; this was the most targets I had pulled from this site in years. I also found a nice 1838 seated half dime! Not sure how I missed that before but the F-75 had pulled more for me in 5 hours than I had found in my last 5 trips to this site. It was a good day, and I was happy. My next spot was a stage stop, again a site that I alone have hammered to death. This site yielded coins back to 1797 in the past but on my last three trips here I dug almost nothing. This really was a favorite spot of mine but I was slowly accepting the fact that I had hunted it out. Two trips here with the F-75 gave up some very small targets, but nothing deep. This past weekend I was again in the company of my friend Mike, and he and I hit the same site I wrote about earlier.


Excitement was high as we walked to the site, discussing what our best plan of action would be. We both figured that we had done a good job the last time and that we would probably have to move to a different location because last time we spent the whole day digging in a 40 square yard area. We were both there a good 6-7 hours and had roamed all over the area numerous times. If there were any targets left, it sure wouldn’t be very many. Mike began hunting in the same spot we already worked, and I ventured a bit further away. Mike was digging targets while I was not, so after an hour I too moved back to the “hot spot”. Again I will save you all the details but we ended up spending the entire day in the same general area, slowly working around it, listening for the faint singles. I tried various settings, but usually ended up with hunting in JE mode, sensitivity all the way up to 95, two tone mode, with disc turn all the way down to 4. With this setup, I was able to hear all of the iron targets, but more importantly also hear the high “zip” of good targets mixed in with the iron. By keeping the disc low it seemed like the masking affect of iron was minimized, or in some cases gone all together. It was not uncommon to dig good targets out a hole with multiple iron targets.


We were both surprised by the fact that we were still finding targets in the exact same area that we hammered weeks before. Granted, they were deeper, smaller, and weaker signals, but we were still digging a lot of targets. I should also mention that this site contains a LOT OF IRON! We spent 9 more hours hunting the exact same area, but then, there was no reason to leave since we kept digging good targets. I ended up with 28 swan shot, 13 pieces of misc. lead splash, 8 large musket balls, part of a cuff link, and 18 buttons. Oh yes, and one coin, but I will come back to that in a bit. The buttons consisted of 5 large pewter 4-hole buttons, two one-piece flat buttons, a kepi button, two two-piece brass eagle cuffs (one Artillery and one Dragoon), four one-piece eagle cuffs in pewter and one one-piece eagle coat button, and four pewter general service (US) buttons! The “US” is visible on all of the general service buttons and the dragoon was my very first! Mike’s take was a little bit better than mine. Boy, what a day! There were two distinct finds that I remember, both were US pewter buttons, one I was able to measure the exact distance. It was the full length of my digger which measures 11 3/4”.


The second button was at about the same level but what makes both of these two finds interesting is that I pulled a one inch chunk of rusted iron out of the hole, before reaching them at a deeper location. One other find was memorable: The 1827 bust dime! This too was a very weak signal, a high “zip” buried in the grunt-grunt of iron targets. It was inconsistent and faint, and I actually began to walk away, but only got a few feet away before turning back to find out what it was. Boy am I glad I did! It was about 10” deep. Mike and I whooped it up, high-fived, took some pictures, and then got back to business. I now have many hours on the F-75 and I must say, this machine is very easy to use, right out of the box. It is sensitive, no question about it and a bit different than what the hobby is used to, but easy to master in a short period of time. Because it’s sensitive, some may find it intimidating, but trust me when I tell you with proper instruction and some tips from your dealer, you too can experience the power of this very versatile machine. I am of the belief at this point, that Dave Johnson and his team of engineers sat down one day and brain- stormed the following concept: what would the perfect coin/relic/gold machine be like? What features would it have? What features would the users want? They came up with a blueprint, then decided on which of those ideas they and the result is the F-75. In principle at least, it seems like the perfect, all around machine. I am by no means an expert, but I really like what I see and I think I will be studying this machine for awhile. So the best advice I can give anyone trying this machine is to take your time, be patient, and give it some time before you decide. This machine may not be for everyone but those that take the time to learn it will do very well."