Fisher F75 Information & Details:
– VLF technology operating at 13 kHz Frequency
– LCD screen with target ID and depth
– “Fast Grab” Ground balancing with manual override
– Three operating modes (discriminate,static all-metal, motion all-metal)
– Display backlight for night or low-light
– 5 year warranty
– 4 AAA alkaline batteries
– Weight 3.5 pounds with batteries
– 11″ Elliptical double D search coil
Fisher F75 Review & Guide:
The Fisher F75 is a multi-purpose high performance metal detector with a large LCD screen. It has the high sensitivity and ground balancing control needed for all aspects of metal detecting including, gold prospecting, beach hunting, and relic searching. The F75 operates at 13 kHz for good sensitivity to gold nuggets and jewelry as well as coins. To give you an idea of what capabilities this detector has, below is a guide on how to use the Fisher F75.
On-Off & Volume Knob is located under the elbow and turns the machine on or off, and controls speaker volume and headphone volume. The F75 has two controls on the front panel, the menu button and settings knob. Push the menu button to go through the selections on the right of the display. With each push of the button, the next menu selection will be highlighted. The settings knob then allows you to modify values for the current highlighted selection. Also, the settings knob will recall the last setting which you adjusted. After you have adjusted a setting, an indicator will remain highlighted next to this menu selection. One push of the button will recall that selection and display the stored value. Also, the settings knob will select the operating mode when the top line of the menu is highlighted (Discrimination or All Metal mode). When the trigger switch (under the display in front of your hand) is pulled back, pinpoint mode is activated. When the trigger is pushed forward, FASTGRAB automatic ground balancing is activated.
Fisher F75 Menu System:
The entire menu is printed on the LCD screen. The display highlights the mode and settings which are in use. There are three search modes, Static All Metals, Motion All Metals, and Discrimination. To change between an All Metals mode and Discrimination mode, highlight the top line of the menu on the LCD screen. When either All Metal or Discrimination is highlighted, use the settings knob to move between the two categories. To select a function, push the menu button and continue pushing in order to move to the function you want. The word “setting” will pop up in the middle of the LCD display, and the current setting will be displayed as a number. To change a setting, rotate the knob. If you select a function and do not make a change to that function after 7 seconds, the detector will exit the menu system automatically, deactivate the settings knob, and resume normal operation. If you press the menu button while the machine is in normal operation, the user interface will return to the last menu feature setting.
Fisher F75 Ground Balance:
The Fisher automatic ground balance is called “fastgrab”. Ground Balancing cancels the unwanted ground signals from mineralized soil while leaving signals from buried metal objects behind. Using ground balance will produce deeper target detection and quieter operation when used properly. Ground Balancing, can be done automatically by pushing the trigger switch forward, or manually in the All Metal menu. The ground balance setting carries through into all operating modes. In Discrimination mode, the ground signal is generally inaudible unless the discrimination setting is 0.
How to Use Fastgrab Automatic Ground Balance on the Fisher F75
Find a spot of ground where there is no metal present. Hold the detector with the search coil about one foot above the ground. Push the trigger switch forward with your finger. Physically pump the search coil and detector up and down over the ground. Lift it about 6 inches above the ground and lower it to within 1 inch of the ground, about once or twice a second. A 2-digit value will appear on the display. This is the Ground Balance setting. If the detector’s internal computer is unable to ground balance, an error message will appear: If the message overload raise coil – can’t GB appears, you will also hear a siren sound. You are probably over metal. If the message can’t GB appears, you may not be pumping the coil, or you may be over a small piece of metal.
How to Use Manual Ground Balance on the Fisher F75
When the ground reads less than 40 using Fastgrab, manual ground balancing is required. Examples include gold prospecting, searching on a wet saltwater beach, or searching in an area with so much metal trash that there is no clean ground for the computer to sample. The range of ground balance settings indicated on the display range from 0 to 99. Each displayed number spans 5 detent steps on the settings knob. The actual internal ground balance settings change with each step and there are a total of 500 different settings. Under some ground conditions you may be able to hear the individual steps in the setting. The most accurate measurement is obtained by pumping the searchcoil, similar to using “fastgrab” automatic ground balancing. The two-digit ground balance number on the LCD shows the type of ground mineralization. The goal is to eliminate the sound as the coil is being pumped over the ground.
Some typical ground mineralization types are:
0 – 10 Wet salt and alkali
5 – 25 Metallic iron. Very few soils in this range. You are probably over metal.
26–39 Very few soils in this range — occasionally some saltwater beaches
40–75 Red, yellow, and brown iron-bearing clay minerals
75–95 Magnetite and other black iron minerals
Fisher F75 Accessories:
No metal detector is complete without having these metal detecting supplies to help make your detecting easier.
Fisher F75 Carrying Bag
Fisher F75 Metal Detector Digging Tools
Where to Hunt with the Fisher F75 Metal Detector?
Research is an important part of metal detecting. Take a look around the area where you live and determine what you are searching for. Is it old relics, coins, or newer drops like change or jewelry? Personally, I like to do both but because of the area I live in, I am primarily a beach hunter. Relic hunting in general is all about research. Do you live near an old wagon trail, a civil war battlefield, or do your relatives have old land? These are all fantastic relic hunting locations. Other then relic hunting there is “coin shooting” which is hunting for coins old and new. Parks, fields, sidewalk tearouts, schoolyards (if allowed) all make great hunting spots.
The beach is my favorite place to metal detect. Why is that? Because it is easy to dig and the beaches are constantly being replenished with fresh drops. During the summer you can go after work, in the morning, or ideally, on Sunday evening to catch all the weekend travellers to see what was left behind. During the winter, storms can move the sand around and you can find older coins and artifacts. The Bounty Hunter Tracker IV will work great on the dry sand of the beach. You may want to turn up the discrimination as the beach can be quite trashy. Be sure to check out my webpage detailing my Beach Metal Detecting Tips.
Are you interested in purchasing the Fisher F75?
With so many relic/general purpose detectors out there it’s really going to come down to your budget and what features are the most important to you. Relic & general purpose hunting requires a machine that has great discrimination to knock out the junk as well as high sensitivity to find the deep targets. Fisher metal detectors are known for their excellent discrimination and the LCD screen with many functions. So where can you get one for the best price? The prices of detectors fluctuate slightly due to sales and if you want the best price why not buy from the websites that have consistently low prices. You might as well buy from a place you are familiar with also right? To the right is the best price on Amazon. Below are current Ebay auctions that include both new and used metal detectors. If you found the information useful and choose to buy from either of these sites, good luck with your relic hunting!
