White’s Electronics Spectra V3 - Manual (Page 17)

Complete Owner’s Guide - Spectra 17
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Sensitivity -
• Press MENU, ARROW to Sensitivity, press ENTER.
• Rx Gain – (Formally called Pre-Amp Gain or Receive Gain) Use ARROW left and right to adjust. Adjusts
the search coil receive signal prior to entering the electronic circuitry for signal processing (pre-amp). Constant
OVERLOAD signals (not over a target) indicated by a low pitch audio beep and display OVERLOAD indication
require a decreased Rx Gain setting. Smooth, stable, predictable results and little or no overload suggest a higher
Rx Gain setting might be usable in that area.
• Tx Boost – Dramatically increases the signal being sent (transmitted) to the search coil (loop). By
increasing the transmit signal, the receive signal is also increased. In low mineralized ground, Tx Boost will
increase detection depth, however, battery life is also reduced significantly, perhaps as much as 50%. May require
adjustment to Rx Gain, Discrimination, and All Metal sensitivity levels. Tx Boost may not be usable in some ground.
• Discrimination – (Formally called AC or Motion Sensitivity). Adjust the sensitivity (responsiveness) of the
Motion Discrimination search modes. The highest setting that will operate smooth, stable, and predictably provides
the best detection results. Usually Discrimination Sensitivity is secondary to Rx Gain to reduce external electrical
noise or interference.
• All Metal – (Formally Called DC or Non-Motion Sensitivity). Adjust the sensitivity (responsiveness) of the
All Metal and Pinpoint search modes. The highest setting that will operate smooth, stable, and predictably, and
provides good pinpoint results, is recommended. Reduced levels typically pinpoint better, however, do not detect or
pinpoint as deep.