Whites BeachHunder ID Manuel de service télécharger pdf (Page 5)

nice feature on the DFX is this ability

to set your own speed. I also mentioned

GROUND FILTERING, and we will get

to that in the next section. However,

you need to know that the sweep speed

of the DFX is not adjustable when

using two filters, as the detector does

that for you. On the other hand, when

using three to six ground filters, you

can set the speed yourself if desired.

Too fast a Sweep Speed and it will get

ahead of the Recovery Speed, but you

don’t want it too slow either. It’s a mat-

ter of choosing the right width of target

signal that the circuitry analyses. You

want a Ground Filter, Recovery, and

Sweep Speed that will give you the best

depth and discrimination. A bit of

experimenting will reveal the ideal

speed for your preference and type of

hunting. If you don’t have a test area

already, bury a few coins away from

each other in clean ground and at vari-

ous depths. Make all your settings and

then try various sweep speeds to see

which provides the best performance.

At this stage it is good to remember,

that all these things are for people who

want to tweak up the DFX’s perfor-

mance. If you are new to the hobby,

don’t get mind boggled. Just let the

detector do the work in the Preset Pro-

grams.

Ground Filtering - As stated ear-

lier, the DFX offers a choice of up to

six filters! What does that mean?

Well, it means versatility. It means

that you can use the same machine for

both coinshooting in parks and relic

hunting in extreme ground. The two

filters will provide a quicker response

to separate closely spaced targets in a

trashy area, while the four, five and six

filters will better handle mineralisa-

tion - and that means more depth.

White’s use this number system to let

you know that as the level of mineral-

isation goes up, the depth penetration

goes down with the lower number of

ground filters being used.

Visual Disc - When this feature is

on, rejected VDI numbers and ICONS

are prevented from appearing on the

display. This keeps the display cleaner

for interpreting other information.

Icons - The ability to look at the

display to see the graphic representa-

tion for a ring pull, nail, screw cap, foil,

or various coins is good. It can speed

things along as you walk. However, it

does slow down the display for other

indications, which in turn slows down

how soon you go to the next target.

V.D.I. Sensitivity - This determines

the strength of response of a target

required to cause a display indication.

It can also provide a third digit to the

VDI number when set to 86 or above. A

lower setting brings fewer and more

reliable indications to the display, but

may also keep deeper targets from

registering. A higher setting brings

more indications to interpret. Try

listening to signals first, and then look

at the display to isolate a good target.

D.C. Phase - Those people who set

their own manual ground balance will

find this of use. When the coil is

stopped over a target or ground, the

D.C. PHASE is shown in the display.

Accumulate, Average, & Fade -

These three controls are listed together

for convenience. With ACCUMULATE

turned ON, SignaGraph information is

gathered from multiple coil passes.

OFF shows information only from the

last coil sweep. AVERAGE is best used

with ACCUMULATE to reduce indica-

tions from strange loop or target

angles. AVERAGE does what it says, it

“averages” received information for the

SignaGraph. FADE is the rate at which

old information is cleared from the Sig-

naGraph. With up to 14 settings, you

can easily choose one that allows

enough time to view the SignaGraph

info before it is reset.

Preamp Gain - This was commonly

known as “signal balance” on older

machines. It is very important to the

depth capability of the detector. Like

Sensitivity, it needs to be set as high as

possible without causing circuit insta-

bility. Unlike Sensitivity, however, it

has a great influence on OVERLOAD.

Overload should not be appearing in

the display during searching. White’s

limit the PREAMP GAIN settings from

1 to 4. Get it as high as possible with-

out OVERLOAD. One thing to remem-

ber is that every time PREAMP GAIN is

changed, the detector needs to be re-

ground balanced.

Multi Frequency Method - The

DFX provides four choices in operating

frequencies: two Frequency Best Data,

two Frequency Correlate, one Fre-

quency 3kHz, or one Frequency 15kHz.

Only one of these can run at a time.

The DFX is offering a choice of fre-

quency settings and not limiting you to

what the manufacturer provides. No

one choice is best for everything. Gold

responds better at higher frequencies,

while silver and copper respond better

at lower frequencies. The 3kHz option

is great for high iron content black sand

when salt is not present, and gives bet-

ter depth on higher conductivity metals

like silver. The 15kHz works well in

lower mineralisation without salt for

gold and cupronickel range targets.

Multi Frequency operation does a great

job in areas with magnetic iron and

conductive salt. The term “BEST

DATA” can be misleading as one of the

two choices in multi frequency. It sug-

gests that it is the “best” method to

use, and while that is often true, it is

not always the case. CORRELATE com-

pares data taken from both the 3kHz

and 15kHz and rejects those that do

not offer predictable information. For

instance, iron does not compare pre-

dictably between the two frequencies,

and thus this method would provide

good iron rejection. The BEST DATA

multi-frequency method transmits and

processes data at both frequencies just

as Correlate does, but then automati-

cally chooses to accept the data from

the most reliable. Both multi-frequency

methods eliminate salt signals. BEST

DATA is the preferred method for most

applications.

V.D.I. Normalisation - Using two

frequencies changes where targets

show up on the normal VDI scale. The

DFX is automatically set up to account

for this when using one of the multi-

frequency methods. But when using

one of the single-frequency methods,

the calibration is different. With NOR-

MALISATION ON, the circuitry recal-

culates and displays the normal V.D.I.s

we are all used to seeing with the

6.59kHz. When OFF, the display

becomes distorted in that the “Silver”

end is expanded and the lower end

compressed when using 3kHz, while

just the opposite happens with 15kHz.

This expanded resolution presents a

bonus when seeking specific targets -

for example, looking in the “nickel-foil”

range for differences between gold jew-

ellery and aluminium.

As previously stated, please don’t

get hung up with all of the foregoing.

The purpose of going through the indi-

vidual details of the DFX was simply to

take some of the mystery out of the set-

tings available as well as to show the

potential of the detector. Having gone

through all of the technical data,

there’s nothing like using a detector for

the real answers and I have tried to do

this in the second half of the report.

Just as a taster, after experimenting

with some of the adjustments, I found

127 non-ferrous finds in just four hours

detecting!

Chris Rogers

March 2002 TREASURE HUNTING 33

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Whites BeachHunder ID Manuel de service Page 5

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