Spectrum DSP M2 User Manual page 31

3.6k Filter. - This enables/disables the filter and when set to "Off", this filter will be
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eliminated from selection when filter button is pressed. The settings will be displayed
in white if this filter is currently selected.
Wide Filter Select - This selects the "wide" filter – that is, the next bandwidth above
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the 3.6 kHz bandwidth with four bandwidth being available: 10 kHz, 7.5 kHz, 6 kHz
and 5 kHz. If one of the "AM" items is selected (e.g. "5kHz AM") then the selected
bandwidth will be available only in AM mode but if a "non-AM" item is selected (e.g.
"5kHz") then this selection will be made available in SSB mode as well.
Wide Filt in CW mode – When ON, the "Wide" SSB filters (3.6 kHz and Wide) will be
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available for selection when in CW mode.
CW Filt in SSB mode – When ON, the "Narrow" CW filters (300 Hz and 500 Hz) will
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be available for selection when in SSB mode.
AM mode disable - When ON, the AM mode will be remove from the selection list
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when the mode button is pressed. Note that it will still be available if one presses-and-
holds the AFG box.
LSB/USB Auto Select – This enables the automatic selection of LSB or USB,
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depending on the current band. The available settings are:
OFF – No automatic selection.
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ON – LSB is selected < 10 MHz, USB is selected >= 10 MHz
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USB 60M – LSB is selected < 10 MHz except for 60 meters and USB is selected
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>= 10 MHz. This setting has been provided for those areas where USB is
typically used on 60 meters (e.g. the U.S.)
When "LSB/USB Auto Select" is enabled, pressing the AFG box will skip the sideband
that is not appropriate for the frequency of operation (e.g. USB will not be selected
below 10 MHz) but pressing-and-holding this button when LSB is displayed will change
the mode to USB – and pressing-and-holding again will change it back to LSB.
When "LSB/USB Auto Select" is enabled, in order to change to AM you must select a
mode other than LSB (or USB) – such as CW – and then press-and-hold the AFG box:
AM will then be selected.
FM mode-related items:
FM Mode Enable - When set to ON the FM mode is available with normal presses of
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the Mode button. Note: Even when off, it may still be accessed if the AFG box is
pressed-and-held in CW mode. If the AM mode is also set as being disabled, you may
have to press-and-hold Mode again to get to FM.
FM Sub Tone Gen – This selects the frequency of the subaudible tone (in Hz) to be
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transmitted on FM: The setting of "off" (default) disables the tone. The deviation of this
tone is approximately +/-300 Hz in "Narrow" mode and +/-600 Hz in "Wide" mode.
FM Sub Tone Det – This selects the frequency of the subaudible tone (in Hz) to be
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decoded on FM: The setting of "off" (default) disables the tone decoder so that only
"carrier squelch" is used. When this is active it is necessary that both the squelch be
opened AND the tone decoded in order for audio to be heard. The "FM" mode
indicator on the main display will be backgrounded in red when the selected tone is
being decoded.
FM Tone Burst – This enables and selects the transmission of a "tone burst" (a.k.a.
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"whistle-up") that might be used to activate some repeaters. Two frequencies are
Spectrum DSP M2 User Manual V1.1
P 31