Spectrum DSP M2 User Manual page 19

Pressing-and-holding the AGC box will "save" the currently-selected DSP mode, if on, and
turn it off. Pressing-and-holding this button again will restore the mode(s) that had been
configured when it had been turned off.
The "strength" of this filter may be adjusted using the menu item #10, "DSP NR Strength" -
but be very careful with this as it easy to go overboard with this setting. If it is set too high,
the artifacts caused by the noise reduction (e.g. "hollow" or "watery" sound) can be worse
than the interference than you are trying to remove!
The "strength" may also be set using the AGC box and swipping up/dwn in the middle-right
area without having to enter the menu system. To do this:
Enable DSP "NR" mode by pressing the DSP button and pressing the NR button.
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Press the AGC box so that the highlighting changes from RFG to DSP on the screen.
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If "NB" is displayed instead, press-and-hold the AGC box to change it.
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With DSP highlighted, swipe up/dwn in the midle-right of the LCD to adjust the DSP
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noise reduction "strength".
You will note that the number denoting DSP "strength" is greyed out when DSP is
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turned off and cannot be adjusted.
IMPORTANT OPERATIONAL NOTES related to DSP and the noise blanker:
All DSP functions are disabled until a few seconds after the radio boots up.
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The notch filter is automatically turned off in CW mode. It cannot be selected when in
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CW mode. The reason for this is that the notch filter would "kill" CW signals!
ALWAYS turn all DSP modes off when you are using any "sound card" (digital) modes
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such as PSK31, RTTY, SSTV, etc. DSP is NOT compatible with these modes!
The noise blanker is always disabled in the wide bandwidth (5, 6, 7.5 or 10 kHz) mode.
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The noise blanker is disabled in AM mode.
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Enabling the noise blanker and DSP can cause the user interface of the Spectrum DSP
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to slow down significantly! What this means is that the response to button-presses and
the updates of the spectrum scope can be significantly slower. (You have been
warned!)
There are additional "advanced" configuration settings related to the DSP modes available:
See the items in the menu system and the section on "Advanced DSP Settings" later in this
manual.
Spectrum DSP M2 User Manual V1.1
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