White’s Electronics Spectra VX3 - Manual (Page 41)

Page 4-4
Spectra VX 3 User’s Guide
However, VX 3 normalizes all VDI’s to a common frequency.
That common frequency is, for historical reasons, 6.592kHz,
meaning the US silver quarter will have a normalized VDI
response of 83 regardless of which frequency you choose.
The Deep Silver program uses the 2.5kHz single frequency
mode, which responds best to silver coins and tends to penetrate
mineralized soil better.
Frequency Offset
This is not a mode, but rather an adjustment control. It was
discussed in Chapter 3: The Frequency Offset control provides
slight offsets (

5 steps) to the selected frequency(ies) and is use-
ful to minimize EMI, especially when hunting near other detec-
torists. In general, adjust the offset up or down to find the
quietest setting. One source of EMI that is difficult to deal with
are electric fences, including invisible dog fences. It is best to
try to have them switched off when hunting.
The frequency offset applies to all active frequencies. If you
have a single frequency mode selected, then the offset shifts
that frequency. If you are in a 3-frequency mode, the offset pro-
portionally shifts all the frequencies.
When making offset adjustments, put VX 3 in pinpoint mode
(by pulling the trigger) and watch the pinpoint bars, like this:
Tip: In single frequency modes, battery consumption is
higher for 2.5kHz, and lowest for 22.5kHz.