Spectrum DSP M2 User Manual V1.1
oscillator and the display by the amount of the sidetone/offset of the transceiver. Compared
to “USB” mode, the display doesn't change at all, but a signal that was zero beat in USB/LSB
mode now becomes audible at the sidetone pitch when set to this mode. The “AUTO SHIFT”
mode is equivalent to the CW mode in many current-production Icom transceivers.
Spectrum Scope related items:
• Spec. Scope 1/Speed - This selects the update rate of the spectrum scope, or it may
be set to OFF which disables the spectrum scope entirely. The OFF setting may be
used to reduce the “helicopter” sound that may be heard under low-signal conditions.
This has been renamed to “1/Speed” as the lower number indicates a slower speed.
• Note: The “helicopter” sound may be significantly reduced by placing an
insulated metal shield between the RF and UI boards.
• Spec/Wfall Scope Filter - This adjusts the “smoothing” of the spectrum scope and
waterfall display. Note: If your board uses an LCD with an SPI interface a smoothing
setting of 1 or 2 is recommended.
• Spec. Trace Colour - This sets the color of the spectrum trace.
• Spec. Grid Colour - This sets the color of the background grid of the spectrum scope.
• Spec/Wfall Scale Colour - This sets the color of the frequency scale along the bottom
of the spectrum scope and waterfall display.
• Spec magnify x32 - When set to ON this changes the span of the spectrum scope
and waterfall display from its normal +/- 96 kHz to +/- 3kHz. It does not increase the
resolution, but rather the thickness of the lines are doubled. Note that in frequency
translate mode, the receive (dial) frequency is always placed in the center of the
screen.
• Spec/Wfall AGC Adj. - This adjusts the AGC response rate of the spectrum scope
and waterfall display. The default setting of 10 yields the same response as the
previous “fixed” setting of earlier firmware.
• Spec Ampl. - This adjusts the number of dB per vertical division that the displayed
signal represents. The available settings are:
◦ 5dB
◦ 7.5dB
◦ 10dB
◦ 15dB
◦ 20dB
◦ 1S-Unit (6dB)
◦ 2S-Unit (12dB)
◦ 3S-Unit (18dB)
Note that while these settings are primarily for adjusting the vertical scale of the
Spectrum Scope, they also have an effect on the brightness and contrast of the
waterfall display. With the approximately dynamic range of the visual spectrum display
being 4 vertical graticules, a typically useful setting of this parameter is “10dB” as this
represents the typical range of signals found on an amateur band under normal
conditions.
It is recommend that you find the optimal setting for the spectrum scope and
then leave it there rather than adjust it for the waterfall display, which has its
P 36
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