Spectrum DSP M2 User Manual page 26

Make a note of the settings that you have used for future reference.
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Find a signal on the bands representative of the mode and adjust the audio input level
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of the external device for approximately "mid-scale".
It should be noted the the Headphone jack will contain the transmit audio. This is an
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artifact of the hardware configuration.
Once you have configured the settings to your satisfaction, press-and-hold button
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MENU then PWR and Confirm to store them in memory.
TUNE mode: (set-up dependent)
The TUNE button may be used to send an unmodulated (CW) carrier for brief testing, such as
checking the RF power output or the VSWR/matching. The TUNE function is also used for
initial adjustment of various parameters (TX Gain, Phase) as described elsewhere in detail.
The operation of the TUNE mode is very simple:
Press the TUNE button: Transmit is enabled and the indicator turns red.
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Press the TUNE button again: The Spectrum DSP stops transmitting and the indicator
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turns white.
Comments about the TUNE mode:
When set to CW mode, when TUNE is activated the Spectrum DSP will produce a
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carrier above the dial frequency by the amount of the setting of the "CW Side/Off
Freq" (e.g. sidetone frequency).
When set to SSB mode, when TUNE is activated the Spectrum DSP will produce a
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carrier that is offset from the dial frequency by 750 Hz – the same as the audible
sidetone. This carrier will be below the dial frequency in LSB mode and above it in
USB mode.
Note: There will be no audible sidetone in "SSB TUNE" mode when Frequency
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Translation is enabled.
Pressing-and-holding the TUNE button will toggle the TRANSMIT DISABLE function.
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If this mode is on, the TUNE indicator will turn grey and all transmit capabilities of the
Spectrum DSP will be disabled. This is the same as the parameter "Transmit
Disable" in the configuration menu.
TUNE mode does not function in AM mode.
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Spectrum DSP M2 User Manual V1.1
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