pull tabs without also rejecting nickels since many types of gold rings are also rejected
alone with the nickel.
This can be done by setting the disc - notch toggle to "notch". The disc/notch variable
control now functions as a variable notch rejection window. The notch can then be adjusted
to reject or "notch out" selected types of pull tabs or other trash. When using the notch
feature more iron and small foil will be automatically rejected by the discrimination circuit
(see Fig 11B). To set the notch, use a pull tab of the type to be rejected. Adjust the notch
control to the point (around 4 or 5) at which the tab is notched out (no response). Now
check a nickel to be sure it is still accepted. Note that some pull tabs or tab pieces have
nearly the same detection properties as nickels and some gold rings. These items can not
be separated.
SPECIAL NOTE: This unit uses a dual tone notch system that automatically identifies
whether a target is above or below the notch. A low tone signifies that the target is below
the notch and a high tone signifies that the target is above the notch (see Fig. 12).
4. Fig 13 FREQUENCY SWITCH: This is a six (6) position rotary switch. It allows you to adjust
the Turbo's operating frequency almost 400 cycles away from its normal 6.59 kilocycles
operating frequency. This will substantially reduce and even eliminate most electrical
interference from sources like power lines and other nearby detectors. This is especially
useful in competitive events where interference between units can cause almost constant
falsing. To use, simply change the switch setting to a point at which the interference is
reduced the most.
5. Fig 14 MODE TOGGLE: This is a three position toggle that has two stationary and one
momentary positions. The momentary position (up) instantly retunes the all metals pinpoint
mode.
The center setting is the all metals pinpoint mode. This mode automatically narrows the
target signal for easier pinpointing. When the speed toggle is set to "fast", the pinpoint
mode narrows the target signal much faster for quicker recovery of the target. The down
position of the toggle is the normal setting for searching in the motion disc/notch mode.
This is a silent search motion mode.
6. Fig. 15 SEARCH COIL CONNECTOR: This is a 5 pin connector for the cable from the search
coil. It also gives the ability to use different size coils with the detector. Fig. 15
7. Fig. 16 DISC - NOTCH TOGGLE: This is a two position toggle switch. When set to "disc",
the unit will function as a standard discriminator in conjunction with the variable control
(#3) "disc/notch". The variable control #3 can then be adjusted to eliminate most
nonferrous trash. In the "notch" position the "disc/notch" control now varies the position of
the notch. Most iron and small foil is automatically ignored. Control #3 can then be
adjusted to reject, or "notch out", a selected narrow band of trash.
8. Fig. 17 STABILITY CONTROL: This is a variable control that, when correctly set, provides
the greatest stability and depth available for the prevailing search conditions. There are
some conditions that can cause the response of the detector to be erratic as you are using
it.
Normally you will not hear any sound from the detector until you pass the search coil over a
good target. However, a multitude of closely spaced trash targets can cause the detector to
emit choppy, sputtering sounds. CB radios, broadcasting antennas, intense mineralization
Summary of Contents for Turbo
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