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Coins and Jewellery - This is simi-

lar to the Coins program but with less

discrimination. This means you will

receive a few more dubious signals but

it is recommended when searching

areas where there is less rubbish.

Jewellery and Beach - Much like

the above, but with settings enhanced

to keep the false signals of salt water

from spoiling your searching. Use this

one on the beach where gold jewellery

can appear anywhere on the display

from iron through to the silver range

due to the amount of debasing that has

been used, as well as the length of time

the object has been buried, size, etc.

Relic - Here the discrimination is

really low to permit the acceptance of

all metals except small iron targets

such as nails and some stainless steel.

It separates ferrous/non-ferrous by dis-

play indications. However, large pieces

of iron such as nails, horseshoes, bro-

ken ploughshares and other fragments

will give a positive signal.

Prospecting - This is a good pro-

gram if you are looking for gold. All

metals will give an audio signal, but the

only ones to give a VDI (number read-

ing) are likely to be gold. I personally

wouldn’t use this programme much in

this country.

Basic Adjustments

Target Volume - Adjusts for the

loudness of the target signal. Some

people believe that setting this very

high will bring greater depth, but this

isn’t necessarily true. Always use a set-

ting that doesn’t cause any discomfort.

Audio Threshold - This is the con-

tinuous background hum. Set it to a

just audible level that is right for your

hearing. Again, lots of old hands will

tell you to have a high threshold setting

for deeper targets - don’t believe them.

Tone (Audio Frequency) - Quite

simply this means pitch of signal. Set it

at a pitch that matches your hearing. I

found the higher range best for my

hearing.

Audio Discrimination - Use the

OFF position to detect all types of met-

als. ON rejects rubbish with different

sounds for different types of targets.

Trash goes silent or gives a clipped

sound, while better targets produce a

solid sound.

Silent Search - I prefer to have a very

low threshold level but for those people

who prefer no background noise this

facility will suit them. Others, of

course, like to hear the background

hum, to listen for subtle changes in

audio such as the threshold fading over

rejected targets, and changes in ground

conditions. As you might expect, AUDIO

DISC is ON, and MIXED MODE is

OFF, during SILENT SEARCH.

Mixed Mode - This means two

modes of operation at once with the

ALL-METAL NON MOTION and the

MOTION DISCRIMINATE mode both

working together - one accepting every-

thing and the other discriminating

rejected targets. For the advanced user

adding TONE ID and/or VCO will lead

to better results. SILENT SEARCH

needs to be OFF and AUDIO DISC ON.

Discrimination settings will give a high

or low pitch signal while the All Metal

mode will give all targets a low-pitched

signal. Together with Motion Discrimi-

nate and All Metal Non-Motion, Mixed

Mode provides a third type of opera-

tion. Discriminate requires coil motion,

All Metal does not.

A.C. Sensitivity - Sets sensitivity

for the motion discriminate mode.

Along with DC SENSITIVITY and PRE-

AMP GAIN, this control determines

how deep the detector will search. It

should be set as high as possible with-

out causing the detector’s circuits to

become unstable and give false signals

(chatter). Experiment with the ground

conditions, adjusting this control and

the Preamp Gain to achieve the greatest

depth possible.

D.C. Sensitivity - Sets sensitivity

for the ALL METAL NON-MOTION

mode for stability and pinpointing.

Shallow targets pinpoint better with a

lower setting. MIXED MODE and VCO

AUDIO are also affected by the D.C.

Sensitivity setting.

Backlight - The use of the back-

light can be quite a drain on the bat-

tery, and this control allows you to use

as little power as possible. In an

improvement over past Spectrum

detectors, the DFX stores the setting

in the custom programs. The backlight

is used for searching in poor light. In

an emergency hold the trigger and

press MENU to turn it on.

Viewing Angle - This is a control

that adjusts the visibility of the display

for various temperatures. The higher

numbers speed up the display to

improve visibility in cooler tempera-

tures, while lower numbers work when

detecting in warmer conditions and in

strong sunlight. Again, the settings can

be saved in the custom programs.

Pro Options

I spent a lot of time messing around

with these options and found that it

pays to experiment. More details will be

given about this in the actual field test.

Ratchet Pinpointing - Pinpointing

has always been a very personal opera-

tion, although a detector’s ability to

pinpoint a target varies greatly between

makes. How many times have you

heard people say that they can’t pin-

point well? This control does the

detuning process automatically. The

previous need to release and then re-

squeeze the pinpointing trigger as the

centre of the coil approaches the centre

of the target is now done by the detec-

tor, reducing the virtual size of the tar-

get. Think carefully before using this

facility as some people prefer to judge

the size of the target before detuning.

S.A.T. Speed - This is an abbrevia-

tion for Self Adjusting Threshold, oth-

erwise known as auto-tune. It keeps

the threshold hum even, which is espe-

cially important when hunting in the

All Metal mode or when Sensitivity is

high. Generally, faster speeds are for

more mineralised ground, and slower

speeds for less mineralised ground.

Without this control the Threshold

would drift due to ground changes, and

the trigger would have to be continu-

ally re-squeezed. In relation to types of

hunting, slower speeds are for coin

hunting, higher speeds are for beach

and relic hunting, and the fastest are

for prospecting.

Tone I.D. - Allows each V.D.I. (tar-

get ID) number to have its own tone.

The higher the V.D.I., the higher the

pitch. There are 191 different pitches

used in the MOTION DISCRIMINA-

TION mode. TONE I.D. comes into its

own when using the MIXED MODE.

V.C.O. - Stands for Voltage Con-

trolled Oscillator, and that means the

stronger the target signal, the higher

the tone pitch. This feature is used in

the non-discriminate modes to aid in

pinpointing as well as helping in

March 2002 TREASURE HUNTING 31

Pro Options Sub Menu #1

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