Description

F75 LTD BLACK – 2 search coils, 5″ DD and 11″ DD

“Most folks figured the F75 was
stretched to the limit and couldn’t be made to go any deeper. Project Engineer
John Gardiner has taken the F75 another leap forward with a more powerful
microprocessor and new DSP code implementing two new signal analysis algorithms
– The “Boost Process” substantially increases depth under most conditions, and
the “Cache Locating Process” is designed to find large deep objects.  The F75 is
already considered by many to be the best all-around metal detector available,
regardless of price. We made the F75LTD even better.”     

— Dave Johnson, Chief Designer

User’s Guide:

The F75 LTD BLACK is an outstanding all-purpose metal detector. Its most popular uses
are finding coins, rings, and jewelry. It is also well suited to find relics and
for gold prospecting as well as beach hunting. Perfect for beginners to very
experienced metal detector users.

The F75 LTD BLACK with additional
program for deeper searching in the high mineralized soils.

This top-off the line metal detector has all the important features you would
expect from a Fisher detector. Light and well balanced with a large LCD screen
that shows you Target Identification, Target Confidence (a new feature) and
Target Depth .You can hunt relics and artifacts with the all-metal mode, or
discriminate (tune out) the junk targets. Best of all You can use your F75 right
out of the box!!!

Multi-purpose
Relic hunting
Coin-shooting
Gold Prospecting

LCD Screen
Large LCD Screen
Target ID Display
Menu System Always Visible

Transmission Technology
Single

Operation Mode
Multi-mode FASTGRAB™- instant or manual Ground cancellation works in all modes

Trigger Switch
Trigger-actuated target pinpointing

Mechanical Design
Ergonomic lightweight, Balanced, Intuitive Interface

Coil
Bi-axial 11-inch

Armrest
2-Way adjustable – armrest adjusts for perfect fit

In The Field

The F75 arrived the day before our family was leaving for a quick trip to the
New Jersey beaches. I already knew that it is a very sensitive VLF induction
balance detector. Therefore, I did not expect it to excel on the saltwater
beaches—but I was in for a surprise. Now don’t misunderstand. I’m not talking
about wading out into the surf, but right along the edge on the wet salted sand,
the F75 did a remarkable job. Minor adjustments allowed me to avoid false
signals and still get great detection depth. Naturally, on the dry sand I could
operate it nearly wide open. Granted, most Southern New Jersey beaches are
lightly mineralized. However, wet salt is wet salt, and there were areas of
black sand as well.

In this sand-blowing, saltwater environment, I was happy that covers for the
control housing and battery box are included with the detector. Although I was
not able to get in as much beach hunting as I would have liked, it was enough to
learn that the F75 could cut the mustard. Right away, I noticed that the large
screen was easy to read. There was no squinting to see target ID numbers or
control adjustments. However, ground balance and help messages were tiny.

After ground balancing in the Motion All-Metal mode, I left it there for a
while, but hunting in All-Metal did not las long due to a great many small
pieces of iron in the beach. My next action was to hunt in the JE process of
Discriminate Mode with low discrimination to try for small gold. That may be OK
for fresh water, but this mode is just too hot for wet salt sand. Although I
could have persisted with lowered sensitivity and higher discrimination
settings, instead I decided to try the DE process with high sensitivity and just
a bit of discrimination for tiny iron.

The Discriminate Mode, to my great surprise, was outstanding. Sensitivity was
raised as high as 80 before false signals became a problem. False signals hit at
ID numbers 16, 17, and 18. Running the coil over the surf was registering #16.
False signals easily discernable by their non-repeatable, wider beeps.
Experimenting with many settings, I found that a slightly lower sensitivity did
bring smooth operation without false signals. Of course, up on the dryer sand,
hunting in high sensitivity was no problem at all.

Most of the time my favorite settings were very low discrimination and Tone at
3H (iron a low buzz, zinc cents and aluminum a medium tone, and better coins
(including nickels) a high tone), Sensitivity just below 80, and dE Process. The
F75 was working quite well on the wet salt sand as I pulled dimes from 8″ and
quarters from 9″, and around iron as well. Those pesky beer bottle caps revealed
themselves with ID numbers that jumped around and did not lock.

Besides great detector performance, I was amazed that I had been hunting for an
hour before I thought of changing arms. That means good ergonomic design for
fatiguefree hunting. No gold jewelry was found, but that was not the detector’s
fault. With the varied amount of items I was scooping up at good depth, if the
coil had gone over gold it would have found it.

I took the F75 to a variety of inland locations, including modern parks, old
parks, schools, and rustic home sites. Parks are always good sites for testing,
because most people buy a detector for coin hunting and need to know how it
handles coins among modern trash. Additionally, I was able to use the F75 in a
competition hunt.

Parks with large expanses of green grass and sports fields in all directions are
a delightful sight to detectorists. The first order of business was to compare
ground balance readings. FASTGRAB was quick and easy, and compared closely to
the manual ground balance reading in Motion All-Metal. Sensitivity was set at
70, Disc 15, #Tones dP (Delta), and Process #dE. When raising Sensitivity to 90
there was some ground chatter, and yet one can tell the difference from
repeatable beeps for targets. When ground chatter did become annoying, lowering
Sensitivity to 75 had it running quiet and smooth. Hunting in JE was also
possible with the lower sensitivity.

I had thought that I would be hunting mostly in the dP Tone with its multiple
target tones. I did like the multi-tone very much; however, a lower tone for a
number of ID #21 targets had me thinking that I might tend to ignore the lower
tones. Although these turned out to be mower-shredded pieces of aluminum, they
could just have easily been good targets such as a small gold ring. Therefore, I
ended up using 4H in dE process most of the time, which kept repeatable, lower
conductivity tones relevant. It also has that fourth tone for many older coins.
Everyone will have his favorites; this tone and process just felt best for me.

Pinpointing was amazingly sharp, and I was able to detune to make it even
sharper. Raising the coil an inch over the target narrows it further. After
pinpointing I could move the coil to the side, put my finger on the ground where
the coil center had been, and find the coin exactly there or within a fraction
of an inch. This happened so many times that I never stopped marveling at the
pinpointing accuracy of this DD coil. For the most part, both coin depth
readings and target ID were very good. There were a few coins that were not
quite as deep as indicated; however, this can be due to their being on edge, or
not getting the center of the coil over the target.

A few of the targets found were a repeatable #42 ID at 4″ (folded over square
tab), ID #60 and 61 were most often zinc cents, ID #51 @ 4″ were two dime-sized
slugs at 5″, #73 @ 3″ was a button from St. Jane School, Riviera Beach,
Maryland, #71 @ 5″ was correct as a dime, #71 @ 5″ another time was not correct
as it was a zinc cent (halo effect, no doubt), #70 was always correct for copper
cents, and #60 was always correct for zinc cents. Target separation for picking
coins from trash and iron was very good.

The F75 is able to process ground matrix info very quickly with a very fast
recovery speed to identify individual targets, plus has a good see-through
ability around small iron. Any ground noise in bad ground can be eliminated or
reduced by setting the ground balance a couple of numbers to the positive. The
most accurate target ID came from coil sweeps that were wide and relaxed,
instead of short, slow sweeps. A faster sweep seemed to go deeper for grabbing
some targets.

One day I was hunting a WWII site with two friends, John Crater and Carl Helm.
They both use a non-Fisher brand detector that is a good one. I was using the
Fisher F75. We had been detecting for about an hour and found quite a few newer
coins but nothing old. John and I stopped to discuss this. While talking, I
noticed a rise in the ground on the other side of the field. I had an idea that
perhaps the top layer had been bulldozed to one side to level it out, and now it
was covered with grass. The little hill ran about 30 yards long, and I started
detecting the top. Right away I received a dime signal at 6-7″ with a solid
beep. It was a Mercury dime from the 1940s.

I called my friends over, and the three of us gave that long hill area a good
going over. We found some shallow modern coins. Neither of them got any deep
hits, but finally the F75 rang out two more times with the same deeper results,
netting me a total of three Mercury dimes. John and Carl are both good hunters,
and it wasn’t due to luck. Those three dimes were found because the F75 was able
to go deep in mineralized ground, give a proper audio and visual target ID at
depth, and notify me with a good solid, repeatable beep. There’s no doubt in my
mind— it was the F75 that made the difference.

A competition hunt came along just as this report was being completed. At the
hunt, as at the wet salt beaches, the F75 dispelled my doubts in yet another
challenging situation…bit time! I already knew that the 11″ double-D could
pinpoint like a champ. When the audio was loudest and pitch highest, that coin
was right below the center of the coil. I’m not going to tell you that it was as
fast as a concentric coil, but nearly so—and that was more than offset by the
ground coverage of the 11″ coil. I also knew that I could sweep the coil at a
good gait, but I was not so sure that the detector would stand up to a real
competition hunt where speed means everything.

There were to be two hunts at the Lancaster Research & Recovery Club Hunt in
Pennsylvania. I decided to use the F75 in the morning hunt and take my losses
for the sake of the field test, then catch up with a concentric coil detector in
the second hunt. Was I in for a shock! Both hunts were for silver dimes and
quarters, with tokens being painted quarters. If you can find a dime you can
certainly find the larger quarter if the coil goes over it. In the first hunt, I
was sweeping that coil fast to cover ground rapidly, and without missing
targets. The F75 made hit after hit with no doubt about the target. Another
shock was the speed at which I could pinpoint under competition conditions. The
proof of in the pudding was at the end of the first hunt. My number of silver
dimes was just as good as most other people’s with competition machines.

When the coins had been cleaned out and folks were just milling around without
finding much, I went over to an area that many people had been avoiding. It is
loaded with pieces of iron that drive detectors crazy. Pennants are used to mark
the area, but there is still deep iron around the perimeter to mask coins. I
picked up an extra half dozen silver dimes with the F75… coins that iron had
hidden from other detectors. In fact, the F75 did so well that I used it in the
second hunt with similar results.

During these events I made several experimental changes with the detector.
Control adjustments were accomplished quickly without delaying my hunting. Since
the targets were silver coins, discrimination was set at a full 65. Sensitivity
was lowered from an initial 70 since seeded targets were shallow. I was picking
up deeper targets, too, but didn’t have time to dig them. Process dE was used
for the entire hunt, and Tones set to hear high tones.

As an afterthought, the realization came that I had changed hands only once
during the hunt— another testament to fatigue free hunting. During the lunch
break, I was discussing the machine with two friends from the Philadelphia area,
Jerry O’Donnell and Dennis Dougherty, and I let them have a go with the F75.
They were also surprised at the lightweight feel for a machine that offered so
many features.

Summary

Targets find it difficult to escape beneath the broad, fast, and deepseeking
sweep of the coil. The innovative 11″ double-D searchcoil handles
mineralization, separates targets, and pinpoints like a concentric. The more one
uses the F75, the more it earns the detectorist’s respect. It will do well in
coin, relic, prospecting, cache, and even many beach hunting situations. The
All-Metal modes, with good control over ground balance and sensitivity, should
make it popular with gold prospectors.

The detector has an external speaker, and there is a 1/4″ stereo headphone jack
at the rear of the armrest. The armrest is fully, and I mean fully, adjustable.
The sides can be bent out or in to match arm width, and the rest can be moved
back and forth for arm length. The configuration is a three-piece Srod,
ergonomic design and lightweight at only 3.5 lbs. with batteries. The spring
clips, locking collars, and durably padded handgrip provide a comfortable,
no-wobble swing.

It has an abundance of feature adjustability to meet many situations. Three
operating modes, straightforward control adjustments with no sub-programming,
fingertip controls, deepseeking target ID, and a five-year warranty are a few of
the things that allow me to readily recommend the F75 for your consideration.

Reprinted with permission from Western & Eastern Treasures (Copyright January
2008)

 

Additional information

Weight 4.00 kg

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