Discriminator Metal Detector
(630-3006)                 Operation                  Faxback Doc. # 41811

Using Headphones

You can connect a pair of stereo headphones (not supplied) to the detector
so you can listen to it privately.  Using headphones also saves battery
power and makes it easier to identify subtle changes in the sounds you hear
for better detection results.  Your local Radio Shack store has a wide
selection of headphones.

To connect headphones to the detector, insert the headphones' 1/8-inch plug
into the HEADPHONE jack on the side of the control housing.

The detector's internal speaker disconnects when you connect headphones.

Listening Safely

To protect your hearing following these guidelines when you use headphones.

  Set the volume to the lowest setting before you begin listening.  After
  you begin listening, adjust the volume to a comfortable level.

  Do not listen at extremely high volume levels.  Extended high volume
  listening can lead to permanent hearing loss.

  Once you set the volume, do not increase it.  Over time, your ears adapt
  to the volume level, so a volume level that does not cause discomfort
  might still damage your hearing.

Traffic Safety

Do not wear headphones while operating your detector near high-traffic

Even though some headphones are designed to let you hear some outside
sounds when listening at normal volume levels, they still can present a
traffic hazard.


Your Radio Shack Discriminator Metal Detector distinguishes between ferrous
and non-ferrous metals.  Ferrous metals contain iron, while non-ferrous
metals such as gold, silver, copper, platinum, aluminum, lead, and zinc do

When the detector senses a metallic object, the meter reading changes, the
NON-FERROUS or FERROUS indicator turns on or off, and the detector sounds
one of three tones.  The actual reaction depends on what metal is detected.
The higher the tone pitch, the stronger the detection.

Preparing The Detector

Turning On the Detector


2.  Hold the detector in a comfortable position, then rotate MODE to the
    desired position.

    Set it to VLF to test battery power and adjust TUNE and GROUND.  (See
    "Tuning the Detector" above, and "Adjusting GROUND" on Faxback Doc.
    # 41812.)

    Set it to TR1 to detect extreme differences in metals, such as between
    iron and gold.  The difference between iron and gold shows on the meter
    (iron in the ferrous section, gold in the non-ferrous section).

    Set it to TR2 to detect finer distinctions between metals, for example
    between aluminum and gold (see "Adjusting DISCRIMINATION" on Faxback
    Doc. # 41812).

Tuning the Detector

TUNE fine-tunes the balance between the detector's receiver and transmitter
circuitry to provide consistent pointer and tone indications.

Follow these steps to set TUNE.

1.  Rotate VOLUME to the 10 o'clock position.

2.  Set MODE to VLF.


4.  Hold the search coil at least 1 foot away from the ground and any metal
    object, hold down the red button on the handle and slowly rotate TUNE
    until the view meter pointer rests at or near 0.

As you search, you can fine-tune the detector using the other controls (see
"Fine-Tuning the Detector" on Faxback Doc. # 41812).

NOTE:  Press the red button on the handle at any time during operation to
       automatically return the pointer to the center of the view meter.

Testing and Using The Detector

To learn how the detector reacts to different metals, you should test it
before you use it the first time.  You can test the detector indoors or

Indoor Testing

1.  Remove any watches, rings, or other metal jewelry you are wearing, then
    place the detector on a wooden or plastic table.

2.  Adjust the search coil's angle so the flat part faces the ceiling.

    NOTE:  Never test the detector on a floor inside a building.  Most
           buildings have metal of some kind in the floor, which might
           interfere with the objects you are testing or mask the signal

3.  Set MODE to TR1.

4.  Move a sample of the material you want the detector to find (such as a
    gold ring or a coin) about 2 inches above the search coil.

    NOTES:  The search coil will not detect without motion.  You must move
            the object since you are not sweeping with the detector at this

            If you are using a coin, the detector detects it more easily if
            you hold it so a flat side (not the edge) is parallel with the
            flat side of the search coil.

If the detector detects the material the NON-FERROUS and FERROUS indicators
flash and the pointer moves to FERROUS or NON-FERROUS while the detector
determines the type of metal it is detecting.  If it detects non-ferrous
metal, it also sounds a tone.

If the detector does not detect the material, check the battery power and
verify that the search coil is properly connected.  Also, you might need
to fine-tune the detector (see "Fine-Tuning the Detector" on Faxback Doc.
# 41812).

Outdoor Testing and Use

1.  Find an area on the ground outside where there is no metal.

2.  Place a sample of the material you want the detector to find (such as a
    gold ring or a coin) on the ground.  (If you are using valuable metal
    such as gold to test the detector, mark the area where you placed the
    item, to help you find it later.  Do not place it in tall grass or

3.  Set MODE to TR1.

4.  While holding the search coil level and about 1-2 inches above the
    ground, slowly move the search coil over the area where you placed the
    sample, sweeping the search coil in a side-to-side motion.

Search coil Sweeping Hints:

  Never sweep the search coil as if it were a pendulum.  Raising the search
  coil while sweeping or at the end of a sweep causes false readings.

  Sweep slowly - hurrying makes you miss targets.

If the detector detects the item, it sounds a tone and the pointer moves to
the type of metal it found.  When you detect metal, switch MODE TR1 to TR2
to determine the quality of the metal.

If the detector does not detect the material, make sure you are moving the
search coil correctly.

NOTES:  The detector responds with a strong signal when it detects most
        valuable metal objects. If a signal does not repeat after you sweep
        the search coil over the target a few times, the target is probably
        junk metal.

        False signals can be caused by trashy ground, electrical interfer-
        ence, or large irregular pieces of junk metal.  False signals are
        usually broken or non-repeatable.

5.  Try finding other metal in the area.  When you find a metal item, wait
    a few seconds after the tone stops before continuing, to allow the
    detector time to reset (or press the red button on the handle to return
    the pointer to the center of the view meter).

(LB/EB 9/18/97)

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