Pictured are some of my finds from this past Saturday’s hunt with the Fisher F75 including a 14K men’s ring, a silver quarter, an Indian Cent, and Civil War items. I have over 1000 hours on my F75, and though I’m always experimenting and looking to improve, I feel that I am “surgical” with it, especially on deep targets and in “hunted out” areas. As you know, there are no magical settings for any given detector, but I thought I’d share how I hunt with it:
Hot Fisher F75 Tips
1) I always run my F75 in All Metal (Right Side) Motion. I never run it with any discrimination whatsoever. I know this runs counter to everything and takes away from the audible differentiation between good and bad signals, but this is how I can hear every single thing under the ground, and this is how I am getting many crazy deep targets. For example, the 1891 Indian I found Saturday was at a measured 14 inches. The gold ring and Marksman medal were easily 10-12” conservatively.
2) Yes this is noisy but you get used to it, especially once you start finding the deep stuff. I use the DetectorPro Gray Ghosts, which are amazing. Clear sound and blocks out external noise. Really maximizes ability to focus on the signals, which is key to dig the deep stuff. I turn the audio down to a level where I can stand the noise. If I am worried about my surroundings, I’ll pull one of them up over my ear and just detect with one of them on.
3) As I said, I run ground balance at 53 pretty much everywhere in middle TN. This seems to be the most stable setting. When I ground balance it usually ends up around 53 anyway. Ground balance is super important for depth, more accurate display readings, reducing falsing and running high sensitivity. With all the targets I dug yesterday, I don’t think I dug more than 3-4 falsing nails. That is crazy even for me.
4) Knowing how to change the channel F1-F7 is key to dealing with interference around power lines and other interference. As you probably know, the F75 will go berzerk and chatter around them very often. Pushing the Pinpoint Switch Forward and pressing the red button changes the channel. I will do this repeatedly when I hit interference, to try to find the most stable channel where I can run my sensitivity high as possible.
5) And yes I generally run sensitivity as high as possible. Usually in the 90s. When I am in heavy trash and iron, I’ll reduce the sensitivity into the 80s or even the 70s until I get a feel for the average level of the nails or trash. At around 75 sensitivity the F75 really seems to be able see through heavy trash.
6) The Swing is the Thing! It is important to have a super smooth practiced swing. I imagine my coil is a paper scanner trying to read text. Just off the ground. Completely level with no rise at ends of swing. My swing is righteous, dude! It’s just like a golf swing. It is best to work on your swing with known items buried at 8 inches or so in a test garden until you feel “surgical” with your F75!
7) In open areas without heavy trash, I have a fairly fast swing – about 1 second left then 1 second right. The F75 is extremely responsive, and when I hear a hit I will slow it down and take a closer look.
8) In heavy trash I shorter my swing and go very slow about two seconds each way left and right with a tight swing going not much further than shoulder to shoulder.
9) How to dig the deepest stuff with the F75 IMHO:
In non-trashy areas:
a) I analyze every signal by watching the display. I am looking at the depth gauge first. I love any deep signal.
b) I isolate the signal, starting with a short, one foot swing and narrow down to a very short 2-3 inch swing – that I call a wiggle – to totally isolate the signal.
c) I am looking for “jumpy numbers”. When the numbers jump back and forth between iron and the high teens or twenties, I usually have a deep, good target. The silver medal, the gold ring, and the Indian cent never jumped more than into the mid-20’s. This is why with discrimination, I would have never seen them or dug them. The accuracy on the numbers on crazy deep targets just isn’t there. I’ve learned to recognize them because they are “jumpy.” Note that some of these targets can only be hit at a single angle. I’ve dug some crazy good stuff I couldn’t hear when turning 90 degrees and scanning them, which is something I do when I’m dealing with a lot of falsing.
You can work on this by burying targets (a bullet or silver dime or whatever your favorite things are) at 10 inches in clear ground in your yard and experiment. Dig it up and push it deeper again and again until you can barely read it. You’ll get a feel for what I mean.
The test garden is of utmost importance to getting depth, because you are practicing with getting a feel for KNOWN deep targets so you can recognize similar target behavior in the field.
This is the most important profound thing I have learned that makes all the difference in the world for me.
10) Trashy areas. As I said before, I generally have to turn sensitivity down. I dig large trash items to get them out of the way. I am pretty much using the same technique as (9), and again looking for jumpy numbers, this time not because of inaccuracy at depth, but because of good targets in proximity to bad targets. The numbers will jump much higher because the targets are shallower, and I can use the short then super short wiggle swing to isolate the target.
11) Pinpointing and Digging Tips:
As you know, pulling the bottom trigger back will pinpoint the last registered signal and give you a usually very accurate depth.
To avoid scratching a target and digging any more than necessary, I usually dig about 3/4 of the depth only and then use my handheld pinpointer. Once I hear the target, I try to dig it out with my (gloved) hand. If I can’t , I carefully try to pry loose surrounding soil with my digging tool.
In heavy trash, because of the proximity of trash/nails/etc, generally trying to pinpoint with the detector is useless so I just pinpoint with the aforementioned wiggle method.
12) Small Coil
Fisher just came out with a small 5” coil which I haven’t obtained yet but plan to. I have one for the e-Trac and this is extremely useful for getting between nails and trash much better with the aforementioned techniques. I will buy a spare shaft so I can more quickly change coils in the field.
If you run an F75 over the ground regularly, please add these humble tips to your arsenal of knowledge. Perhaps there is something here that will help you. Best of luck on your next hunt!
Join the Discussion
Please discuss this article below!!! We want to hear from you. If you like this article, please reward us by liking D365 or this article on Facebook or Twitter.