Spectrum DSP M2 User Manual page 22

There are certain configurations where some/all of the DSP functions are not
available. For example, the notch filter is disabled in CW mode (for obvious
reasons!) and DSP is completely disabled in FM mode.
If RIT is desired, use RIT to shift the receive frequency: The small frequency display
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will show actual receive frequency display when RIT is set to non-zero, but the large
display will show the transmit frequency.
Transmit: (set-up dependent)
Set the receive frequency and mode, setting the desired output power by pressing the RIT
box. Note that it is recommended that for voice modes that "full" power not be used
unless you have carefully configured for clean, linear output power.
Initial SSB transmit audio set-up: (set-up dependent)
Preferably, connect the Spectrum DSP to a 50 ohm dummy load capable of handling at
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least 10 watts. Alternatively, you may tune to a clear frequency while connected to an
antenna with a known-good 50 ohm match.
Use the mode button to select LSB or USB mode as desired.
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Press the AGC box to select the AUDIO meter.
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Connect the microphone to connector (optional port): The Spectrum DSP is typically
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used with an electret-type microphone element and power for the microphone element
is supplied by the radio.
Press the RIT box to switch from RIT to MIC. If the box to the right-hand side of RIT
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shows "LIN" which indicates that line-input mode is active, press the RIT box to
change it to MIC. Press the RIT box as necessary to highlight MIC on the display:
This allows the adjustment of the microphone gain.
Now, key the radio using the Push-to-Talk (PTT) button on the microphone: The
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spectrum display should freeze.
Speak normally into the microphone. You should see the indicator on the AUDIO
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meter bounce upwards. While speaking, swipe up/dwn th the right side of the LCD to
adjust the MIC parameter, so that the AUDIO meter indication peaks up to +4 or so (in
the red) on peaks. Occasional, higher, higher peaks are permissible, but avoid settings
that cause full-scale indications which could imply distortion.
Release the PTT button and press the AGC box to select the ALC meter.
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Press the AFG box to highlight the CMP on the display: This will allow the adjustment
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of the compression level of the speech processor.
Press the PTT button and speak normally again. You should see the ALC meter
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indicate upwards on voice peaks occasionally: If it does not, increase the MICrophone
gain slightly.
Adjusting CMP (set-up dependent) to a higher value will increase the aggressiveness
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of the speech processor: A value of 2 for mildly compressed, a modest value and a
value of 12, while very "punchy" can be used to maximize "talk power" will sound very
"processed" and is likely to be unpleasant for normal, casual QSOs. The value of "SV"
will select custom settings – see the menu for additional information.
Once you have configured the settings to your satisfaction, press-and-hold button F1 to
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store them in memory.
Spectrum DSP M2 User Manual V1.1
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