Fisher F75 User Guide
F75
ACCESSORIES
FOR COMPLETE DETAILS VISIT WWW.FISHERLAB.COM • 1-800-685-5050
Fisher Padded Carry Bag
......
$ 45.00
Rugged double stitched construction. Includes handy
exterior pocket for extra batteries or small accessories.
103693000C
Fisher Stereo Headphones
......
$ 40.00
Use with Fisher metal detectors. Lightweight and adjustable with
true stereo sound, adjustable volume, 1/8 jack with 1/4 adaptor,
4’ cable. 9720950000
Fisher Pin Pointer
......
$ 69.00
Pinpoints the exact location of buried metal objects. Audio signal
indicator and vibrator. Runs on 1 – 9-Volt Battery. FPOINT
Metal Sand Scoop
......
$ 29.99
Large galvanized metal scoop with filtering holes.
Strong Rubberized grip. SAND SCOOP
Lesche Knife
......
$ 49.95
Made from high quality heat-treated tempered steel.
The ultimate digging tool. Comes with a durable sheath.
12" in length with a 7" serrated blade. LESCHE KNIFE
Fisher Apron
......
$ 5.95
Natural canvas with 2 large pockets.
Fisher Baseball Cap
......
$ 14.95
One size fits all. FCAP
Fisher T-Shirt*
......
$ 19.99
100% white cotton with Fisher® Logo. Sizes – LG, XL & XXL
Replacement/Accessory Search Coils
11” Biaxial Accessory Coil - 11COIL-F75
......
$ 199.95
10” Concentric Standard Coil (replacement)– 10COIL-F70
.
$ 179.00
6.5” Concentric Accessory Coil - 6COIL-E
......
$ 169.00
5” Biaxial Accessory Coil - 5COIL-F75
......
$ 159.95
Coil Covers
Specially made to protect your coil from abrasion and damage.
11” Biaxial Accessory Coil Cover – COVER-11DD
......
$ 19.99
10” Concentric Standard Coil Cover – F70COVER
......
$ 19.95
6.5” Concentric Accessory Coil Cover- 6COVER-E
......
$ 7.00
5” Biaxial Accessory Coil Cover - 5COVER-CZ3
......
$ 7.00
Fisher® Face Rain Cover
......
$ 10.95
Specially made to protect your F70 from weather
Gold
Prospecting Kits
$ 29.99 $ 59.99 $ 109.99
*Image not shown.
Comprehensive Operating Manual & Guide to Metal Detecting
Metal Detector
CCoommpprreehheennssiivvee OOppeerraattiinngg MMaannuuaal
&& GGuuiiddee ttoo MMeettaall DDeetteeccttiinng
g
l
M75 Rev.2 122811
F75
Comprehensive Operating Manual & Guide to Metal Detecting
F75
Comprehensive Operating Manual & Guide to Metal Detecting
The F75 is a multipurpose metal detector. Its most popular uses are coinshooting
and relic hunting, and it is also well-suited to gold prospecting.
PRODUCT FEATURES
• Light weight and well-balanced: best ergonomically engineered detector in the
industry.
• Intuitive menu-driven user interface
• Large LCD screen
• Visual indicators of important values such as:
Target Identification
Target Confidence
Target Depth (both running-depth and pinpoint-depth)
Ground Mineralization
• Multiple Search Modes:
Discrimination
Static All-Metal
Motion All-Metal
• Trigger-actuated FASTGRAB™ ground balancing with manual override
• Waterproof 11-inch open-frame BiAxial™ searchcoil
Housing constructed of a carbon fiber-polycarbonate blend
• Trigger-actuated target pinpointing with variable audio pitch
• Fully Adjustable Arm Rest
• Display backlight for night and low-light conditions
• Notch and discrimination controls
• Covers provided for both the control housing and battery box.
• Made in the USA
5-Year Limited Warranty
The F75 metal detector is warranted against defects in materials and
workmanship under normal use for five years from the date of purchase to the
original owner.
Damage due to neglect, accidental damage or misuse of this product is not
covered under this warranty. Decisions regarding abuse or misuse of the
detector are made solely at the discretion of the manufacturer.
Proof of Purchase is required to make a claim under this warranty.
Liability under this Warranty is limited to replacing or repairing, at our option,
the metal detector returned, shipping cost prepaid, to Fisher Labs. Shipping
cost to Fisher Labs is the responsibility of the consumer.
To return your detector for service, please first contact Fisher Labs for a Return
Authorization (RA) Number. Reference the RAnumber on your package and
return the detector within 15 days of calling to:
Fisher Research Labs, Inc.
1465-H Henry Brennan Dr.
El Paso, TX 79936
Phone: 915-225-0333 ext.118
Fax: 915-225-0336
Warranty coverage does not include the cost of transporting the detector back
to an owner who is located outside of the United States of America.
NOTE TO CUSTOMERS OUTSIDE THE U.S.A.
This warranty may vary in other countries, check with your distributor for details.
Warranty does not cover shipping costs.
According to FCC part 15.21 Changes or Modifications made to this device not expressly approved
by the party responsible for compliance could void the users authority to operate this equipment.
If you have any questions, or need assistance with your metal detector,
Call
1-915-225-0333, and ask for Fisher Hobby Technical Service
Copyright© 2011 by Fisher Research Labs, Inc.
All rights reserved, including the right to reproduce this book, or parts thereof, in any form.
Published by Fisher Research Labs, Inc.
Fisher®is a registered trademark of Fisher Research Labs, Inc.
Copyright Fisher Research Labs, Inc.
1465-H Henry Brennan Dr., El Paso, TX 79936 • (915) 225-0333
2
www.fisherlab.com
43
F75
Comprehensive Operating Manual & Guide to Metal Detecting
F75
Comprehensive Operating Manual & Guide to Metal Detecting
How Metal Detectors Work
Most hobby metal detectors use VLF Induction Balance technology. Here's how they work.
The searchcoil (also called search head or loop) contains two electrical induction coils which
are like antennas. One coil transmits a rapidly alternating magnetic field,
region surrounding the searchcoil. If metal is present, its electrical conductivity distorts the
magnetic field. If iron metal is present, its magnetism also distorts the magnetic field, but in a
different way, allowing the metal detector to distinguish between ferrous and nonferrous
metals.
The other coil is a receiving antenna which detects changes in the magnetic field caused by
the presence of metal. Electronic circuits amplify this weak signal, analyze it to determine the
changes which occur as the searchcoil sweeps over the target, and then convey the
information to the user in the form of a visual display or audio tones. Most modern metal
detectors perform many of these tasks in software running on an internal microcomputer.
The iron minerals which are present in most soils also distort the magnetic field, obscuring the
weak signals of small or deep objects. This can cause the object to go undetected, or to be
misidentified when it is detected. Much of the technology that goes into modern metal
detectors is devoted to the task of eliminating the unwanted signals from iron minerals in the
soil, while not losing the signals from metal objects.
This device has been designed to operate with the antennas listed below, and having a
maximum gain of 3 dB. Antennas not included in this list or having a gain greater than 3 dB
are strictly prohibited for use with this device. The required antenna impedance is 53 ohms.
10COIL-F70, 11COIL-F75, 5COIL-F75, 6COIL-E
The following statement is not relevant to metal detectors but is printed here to satisfy
legal notification requirement:
“To reduce potential radio interference to other users, the antenna type and its gain should be
so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that
permitted for successful communication.”
The following countries allow free movement of this product within the European community:
FIN,LVA,SVN,SUI,BIH.
42
illuminating the
Table Of Contents
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Quick-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Mechanicals
Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7
Mechanicals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Arm Rest adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Using Headphones (not included) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Introduction to the F75
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12
Menu System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Ground Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-16
Motion All Metal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Static All Metal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Discrimination Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19-22
PinPoint Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
LCD Visual Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24-26
Numeric Target Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Probable Target Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Target Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Depth Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Confidence Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Fe
Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
3O4
Battery Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
G.B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..26
Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Frequency Shifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Capabilities & Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28-30
Tips & Techniques
Search Techniques
How to sweep the searchcoil . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Pinpointing targets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Estimating target size and depth . . . . . . . . . . . . . . . . . . . . . . .31-32
False signals and chatter . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33-34
Adjusting Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Tips on ground balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Detecting Activities
Coinshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Relic Hunting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37-38
Gold Prospecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38-39
Cache Hunting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Shallow Water Hunting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40-41
Salt-Water Hunting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
How metal detectors work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Back Page
3
F75
Comprehensive Operating Manual & Guide to Metal Detecting
F75
Comprehensive Operating Manual & Guide to Metal Detecting
Specifications
Mechanical: S-rod with electronics housing mounted on handgrip, 3-piece
breakdown, batteries under elbow, 2-way armrest adjustment —
forward/backward & around forearm.
Searchcoil: 11” (28 cm) open-frame elliptical double-D, waterproof.
Batteries: 4 AA, alkaline (not included).
Weight: 3.5 pounds (1.6 kg) with alkaline batteries installed.
Static Balance: force in vertical plane normal to elbow 0.47 pounds (0.22 kg).Varies
with adjustment and user’s stance and arm/hand physiology.
Dynamic Balance: axial moment, 0.29 foot-pounds (0.39 newton-meters). Varies with
adjustment and user’s stance and arm/hand physiology.
Sweep Effort: lateral moment 5.2 foot-pounds (7.1 newton-meters).
Operating Principle: VLF induction balance
Operating Frequency: nominal 13 kHz, quartz crystal timing reference
13158Hz, 13100Hz, 1043Hz, 12987Hz, 12931Hz, 12876Hz, 12821Hz
Basic Sensitivity: 6 x 109root Hertz (detectivity)
Lag Coefficient: 78 milliseconds
Reactive Overload: approximately 10,000 micro-cgs units (volume susceptibility)
40,000 micro-cgs units with sensitivity < 30.
Detecting Activities (continued)
Shallow Water Hunting (continued)
When searching on a beach, it is best to either search in Motion All Metal mode, or to search
with the discrimination level set just high enough to eliminate iron, because the value of beach
finds is largely in the jewelry rather than in the coins. You will dig a lot of aluminum trash, but
the digging is easy, and you can tell people that you are helping to clean up the beach and
make it safer for people's feet. We recommend the use of a special
valuables from the sand quickly -- most metal detector dealers sell these.
The electrical conductivity of the water itself can pose some challenges. You may get false
signals when going into and coming out of the water, making it necessary to pay careful
attention to keep the coil either in or out of the water, but not to touch the surface. This effect
may be observed in either fresh or salt water.
sand scoop for recovering
Salt Water Hunting
Salt water is highly conductive, and produces a strong signal which is like that of metal.
The
F75 is not specifically designed for high performance in salt water, but can be used in this
environment.
If you desire to search in or over salt water, the following measures will usually be sufficient to
silence the salt water response while retaining acceptable sensitivity:
1. Set the
2. Ground balance the machine manually in Motion All Metal mode.
3. Search in the Discrimination mode with a discrimination setting
sensitivity in both modes to less than 30.
higher than 25.
Resistive Overload: approximately 1,200 micro-cgs units (volume susceptibility)
4,800 micro-cgs units with sensitivity < 30.
Ground Balancing Range: From ferrite to salt, inclusive
Discrimination
Ground Suppression:
ID Ground Suppression: third order
Battery Life: Typically 40 hours with high quality alkaline batteries
Operating Temp Range: 4 to +122 degrees F (-20 to +50 degrees C)
Operating Humidity Range: 0-90% non-condensing
combination of second and third order methods
Estimated 80 hours with nickel oxyhydroxide batteries
Estimated 65 hours with lithium iron disulfide batteries
4
Treasure Hunter’s Code of Ethics:
• Always check Federal, State, County and local laws before searching
• Respect private property and do not enter private property without the owner’s permission.
• Take care to refill all holes and leave no damage.
• Remove and dispose of any and all trash and litter found.
• Appreciate and protect our inheritance of natural resources, wildlife and private property.
• Act as an ambassador for the hobby, use thoughtfulness, consideration and courtesy at all
times.
• Never destroy historical or archaeological treasures.
• All treasure hunters may be judged by the example you set; always conduct yourself with
courtesy and consideration of others
Copyright Fisher Research Labs, Inc. 2011.
41
F75
Comprehensive Operating Manual & Guide to Metal Detecting
F75
Comprehensive Operating Manual & Guide to Metal Detecting
Detecting Activities (continued)
Cache Hunting
A cache (pronounced "cash") is an accumulation of
money, jewelry, gold, or other valuables, which someone
has hidden. When people bury a cache, they usually put
it in a strongbox or in a jar. To search for a cache, you
first need a reason to believe the cache may exist. This
means doing research. Some caches have been the
subject of many stories you can read about in print, but
you need to be able to sort fact from fiction. If you can get
copies of old newspaper stories about the circumstances
surrounding the hiding of the cache, you may find
discrepancies which help you to judge the reliability of the
information available. Often the best information on an
old cache is to be learned from old timers who live in the
area where the cache is thought to be. In the case of
newer caches, often the only information is what can be
obtained from family and acquaintances of the person
who is believed to have hidden the cache.
The ownership of a cache is not always clear. Sometimes
it belongs to the person or heirs of the person who hid it,
sometimes it belongs to the owner of the property on which
it is located, and sometimes it belongs to the person who
finds it -- or some combination of the above. If the contents
of the cache were stolen, this fact can also complicate the
question of ownership. Find out what laws apply to the
cache in question, and always make sure that the issue of
ownership is resolved prior to recovering a cache.
Quick Start
Use your F75 right out of the box
1. Assemble the detector (see instructions beginning page 4).
2 Install four AA
3. Turn the knob, located under the armrest, fully clockwise.
This turns the machine on and sets audio volume to maximum.
4. When first turned on, the
Sensitivity preset to 60
Discrimination Level preset to 10
Number of Tones preset to 3
Process# preset to dE
Sweep the searchcoil from side to side, parallel to the ground. Keep the searchcoil
moving over the ground. If you stop moving the searchcoil, the sound will also stop.
Probable target type will be indicated at the top of the LCD screen.
5. If the searchcoil is not in motion and not close to metal, the detector should be
silent.
6. If you experience false signals from electrical interference, from the soil itself, or
from lots of trash metal, press the MENU button.
Sensitivity will be highlighted.
Rotate the
Reduce the sensitivity setting until the false signals go away.
After 7 seconds, the machine will exit the menu and return to
alkaline batteries. All positive (button-end) terminals point up.
F75 starts out in the Discrimination mode, with:
Settings knob to the left (counterclockwise),
normal operation.
Compared to a coin, a cache is usually large and deep. Searching in Motion All Metal mode is
recommended. However, for a really deep cache, it may be advantageous to search in STAT
mode, frequently pulling the trigger momentarily to maximize sensitivity.
Shallow Water Hunting
All Fisher Research Labs searchcoils are waterproof, allowing you to search in shallow water
about two feet deep. If searching around water, be careful not to get the electronics housing
wet. Avoid salt spray, as it will work its way into the control housing and damage the
electronics -- such damage is not covered by the warranty.
Both fresh and salt water beaches are popular places for metal detecting. Vacationers lose
money and jewelry playing in the sand and in the water. It is usually easy to dig in a beach
environment, and metal detecting is permitted on most beaches. Occasionally you may be
able to help someone recover a piece of jewelry they have lost minutes before; this is a
gratifying experience.
40
7. Find a patch of ground free of metal, toss a coin on the ground and sweep back and forth
over it a few times to get a feel for how the machine responds.
8. You are now ready to search.
9. Pull and hold the trigger switch with your index finger to pinpoint the exact location of
targets, making them easier to unearth.
When the trigger is pulled, PinPoint is engaged ….
The searchcoil need not be in motion to detect an object.
The 2-digit numeric display indicates approximate target depth, in inches.
5
F75
Release Clip
Battery Compartment
Hand-grip
2-way
adjustable
armrest
On/Off &
Volume
Switch
Menu
Botton
Headphone Jack
Search
Coil Cable
Settings
Switch
Biaxial Searchoil
Dual-function
Trigger switch
S-Rod
Lock
ing
Coll
ar
Lock
ing
Coll
ar
Velcro
Strap
Velcro
Strap
Cable
Plug
Middle
Stem
Lower
Ste
m
Comprehensive Operating Manual & Guide to Metal Detecting
F75
Comprehensive Operating Manual & Guide to Metal Detecting
Assembly
Is easy and requires no tools.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Position detector upright.
Rotate the LOCKING COLLAR
fully counterclockwise.
Insert your finger inside the tube
and make sure the INTERNAL
CAM LOCK is flush with the
inside of the tube.
Insert the MIDDLE STEM into the
S-ROD.
Rotate the MIDDLE STEM until
the SILVER BUTTON locates in
the hole.
Twist the LOCKING COLLAR fully in
the clockwise direction until it locks.
If your detector has 3 tubes and 2
Locking Collars, repeat this process on the
Lower Stem.
Position the Lower Stem with the Silver Button
toward the back.
Using the Bolt, Single Rubber Washer, and
Knurled Knob, attach the Searchcoil to the
Lower Stem.
Adjust the Lower Stem to a length that
lets you maintain a comfortable upright
posture, with your arm relaxed at your
side, and the Searchcoil parallel to the
ground in front of you.
Wind the Cable securely around the
Stems.
A loose or moving Cable can cause false
signals.
Detecting Activities (continued)
Gold Prospecting (continued)
Because most gold nuggets are tiny, and are usually found in
soil which is high in iron oxide minerals, serious gold
prospecting requires a detector with high sensitivity
and true ground balanced motion all metal
operation. Run the machine with the sensitivity
high enough to hear some noise from ground
minerals, and
sounds you hear. Headphones are
recommended unless consideration for
safety (for instance rattlesnakes)
rules them out. Move the
searchcoil slowly and deliberately,
carefully controlling its height
above the ground to minimize
noise from iron minerals in the
soil. If you hear ground noise, your
Ground Setting could be a bit off,
so perform the ground balancing
procedure again. As you walk even a very short
distance, ground conditions can change. The
ground geology typically associated with gold will
tend to change over very short distances.
The Fe
mineralization in the soil. In most gold fields, especially
alluvial (placer) deposits, gold tends to be associated with
iron minerals, especially magnetite
this to be the case in the area you're working, you can
maximize your gold recovery by concentrating your effort
on areas where the bar graph indicates higher amounts of
iron mineralization.
Gold prospectors are mostly a friendly bunch, and willing to spend some time showing a
beginner how to increase his odds of finding the yellow stuff. Many will invite you to search on
their claims (if they have any) once they get to know you. In some gold areas, a lot of the
terrain is under claim, so you need to learn how to recognize posted claims and stay off of them
unless you have the claim owner's permission. Prospecting clubs such as the GPAAoften own
claims which are open to their members, and sponsor group outings to good gold areas.
It’s a thrilling experience to dig into the ground and pull out a precious piece of yellow metal
that you are the first person on earth to see. If you love being outdoors, have patience, and
can stay motivated by the prospect of finding that next nugget, then
the hobby for you. While only a few get rich prospecting, if you are not among them, think of it
as outdoor recreation where your finds defray the expense of having fun!
learn the language of the
bar graph indicates the amount of iron
3O4
black sand. If you know
beeping for gold may be
6
39
F75
Comprehensive Operating Manual & Guide to Metal Detecting
F75
Comprehensive Operating Manual & Guide to Metal Detecting
Detecting Activities (continued)
Relic Hunting (continued)
interest in specific items, like buttons, make a button collection, and within that collection,
document the circumstances surrounding each button found. If your finds are mixed together,
without categorization or documentation, their context will be lost.
The ground balancing and Fe
of a site. In this way you might determine which areas have been dug, backfilled, or subjected
to fire. This information in turn helps to reveal the history of the site.
To find promising sites to hunt, conduct research at your local library, look for clues in old
newspapers, and seek information on the internet. Where did buildings used to be? Which
have since been torn down? Where did people gather for public events like dances and county
fairs? Where did train and stage lines run? Where were the swimming holes? In almost
every town there is a historical society and museum of local history. Most museums are
grateful for anything they can put on display, and when you dig something you cannot identify,
the curator can often identify it for you. If you work closely with the local historical society or
museum, landowners will be more willing to grant you permission to search their property.
Some of the most promising sites for relic hunting are places being cleared for development.
After the site is built on, whatever is in the ground will become inaccessible. The property
owner can often be persuaded that the site should be searched immediately while it is still
searchable.
bar graph features of the F75 can be used to map the soils
3O4
Gold Prospecting
Assembly (continued)
11.
Connect Cable Plug to housing.
Do not twist the Cable or Plug. Turn Locking Ring only. Use minimal finger pressure to
start the threads. Do not cross-thread. When the Locking Ring is fully engaged over the
threaded connector, give it a firm turn to make sure that it is very tight. When the Locking
Ring is fully engaged over the threaded connector, it may not cover all of the threads.
12.
Tighten both Locking Collars.
13.
Secure the Cable with the 2 Velcro Straps provided, one on the Lower Stem close to the
Searchcoil, and one on the Upper Stem, close to the housing. Leave just enough slack in
the Cable, at the Searchcoil end, to be able to rotate the Searchcoil a small amount about
the Bolt. After full assembly and upon first use in the field, check this adjustment. It is
very important to keep the Cable secure against the Stem, especially at high Gain, as
movement in the Cable may cause false signals.
In the United States, gold is found in many places in the western states, Alaska, and in a few
localities in the Appalachians. The old saying "Gold is where you find it", means that to find
gold, you should look in areas where the yellow metal is known to be present.
Hillsides are the best areas for gold prospecting using a metal detector, because hillsides
cannot be cleaned out by panning and dredging the way streams can. Also, gold on hillsides,
not far from its source vein, tends to be larger, and hence more readily detected, than alluvial
(placer) gold which tends to get pounded to pieces and worn away as it rolls along the
streambed with gravel during floods. Gold is valuable because it is a scarce commodity. Even
in a good gold producing area, you will often spend an entire day without finding any gold.
Meanwhile you will dig bits and pieces of other metal-- birdshot, shells and bullets from
hunting and target practice, bits of rusted barbed wire, chips off shovels and other mining
tools, rusted tin cans, etc. Hot rocks -- rocks containing concentrations of iron oxides that
sound like metal when you pass over them -- are also a nuisance in many gold areas.
Discrimination is usually ineffective because the loss of sensitivity resulting from discrimination
is enough to cause those little nuggets to vanish. If you have gone many hours without finding
gold and are wondering if there is something wrong with your metal detector or how you are
using it, the most important clue is this: if you are digging
gold were present you would have found small gold pieces too!
tiny pieces of trash metal, then if
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