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Spectra VX
3
User’s Guide
more power, so for maximum battery life try to keep the back-
light to a minimum.
Sensitivity
Once you select a basic program you may need to adjust the
sensitivity settings. Most of the
VX
3
programs are set up with
nominal sensitivities, but the Hi-Pro program is set up a little
hotter.
Most users believe sensitivity should be run as high as pos-
sible. In some cases this is true, but if you find the detector is
noisy and falses a lot you probably need to turn it down. There
are three primary sensitivity settings: Rx Gain, All Metal, and
Disc.
Rx Gain
Rx Gain (sometimes called
preamp gain
) sets the gain of the
receiver’s input amplifier. In most cases, you want to set this as
high as possible and still maintain stable operation.
Three things can limit the maximum gain setting. The first
is external noise, such as electro-magnetic interference (EMI)
including 50/60Hz mains and RF. EMI typically shows up as
Tip:
Press/hold the
ON/OFF
button for ~3 seconds to quickly
set the backlight level to 20.
VX
3
will not turn off.
