White’s Electronics Spectra V3 - Manual (Page 36)

36 Complete Owner’s Guide - Spectra
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with a progressively higher pitch “beep”. If accepted by the discrimination settings, iron
type targets will produce the lowest pitch “beep”; large silver will produce the highest
pitched “beep”. Nickels in the mid range indicate with the most medium pitched beep.
Discrimination rejected target signals are still suppressed. With some practice, the pitch
of the ‘beep” immediately indicates the approximate VDI range of the target without noting
the display. Tone ID is used to highlight target signal ranges of interest. Some experts
rely heavily upon tone ID where as others never use it. It will dramatically increase the
variation of the audio signals to interpret.
• Modulation –When selected deeper or weaker target signals produce a difference in
the volume or intensity of the target response “beep”. Deeper signals produce softer
sounding “beeps”. Most experts prefer modulation because the deeper (more likely to
be valuable) targets are more easily recognized compared to shallower targets signals.
When recognized as a deeper target, the discrimination and display information is
given more attention as these targets typically produce less reliable discrimination
and display information.
• Range – Selects the modulation range. Selects the specific strength of a target
signal that initiates a reduced audio “beep”. The range is selectable for three reasons -
1) First, ground mineral conditions vary how modulation performs. Low
mineral grounds will not provide the same results as high mineral ground. 0 provides
very little change in ‘beep’ volume or intensity in low mineral ground. 5 will provide
the largest variable in “beep” volume or intensity in low mineral ground.
2) Secondly, Some experts prefer modulation that will provide a gradual declining
scale as target signals are found deeper into the ground. Others prefer that only
the deepest targets provide any declining “beep” volume or intensity.
3) Third, ground mineral anomalies (small hot rocks) can cause a weak signal
response. By adjusting modulation, quite operation can often be achieved in
difficult ground conditions.
• ALL Metal – Provides for searching when all metal types are desired, no trash metal
rejection. Even if custom discriminate settings are used to accept all VDI numbers from
-95-+95, (no targets rejected, all targets accepted), it is not the same as a true all metal mode.
All metal modes require no or very little search coil movement to respond to metal (depending
upon SAT settings) and tend not to respond to many of the Hot Rocks or ground mineral
anomalies that typically respond in the Discrimination (motion) search mode. When searching
for all metal, or in a difficult area of Hot Rocks, All Metal is a better search mode. Display still
provides trash rejection information, and audio responds to all types of metal. Although
minimized by modern circuitry, all metal tends to detect deeper than Discrimination, but is not as
user friendly. Deeper targets always produced weaker response, lower volume or lower intensity
‘beep’. Stability is compromised and not as smooth as Discrimination, and more susceptible
to ground and external electrical noise.
• VCO – Adds the VCO (Voltage Controlled Oscillator) to the All Metal search mode.
When ON, VCO provides a progressively higher pitch ‘beep” as the signal strength
intensifies. Target center, multiple targets near each other, and deep targets, become
easier to recognize for display indication consideration.
• Mixed Mode – Selects and chooses options for a highbred mode that combines both
Discrimination and All Metal mode characteristics and performance. During search coil
sweeps, Discrimination is the active search mode. With slowed search coil movement,
All Metal mode automatically becomes active. Sweep slowly (all metal) then speeding