Spectrum DSP M2 User Manual V1.1
Operational notes, and known issues:
• DSP Noise reduction enabled: When both scope and Trace are enabled, the speed of
the screen updates falls due to the extra processing requirements. If DSP NR is
enabled the situation may start to overload the MCU, the Trace will then be
automatically disabled to reduce the load, if the load continues to be excessive, Noise
Reduction will be disabled. We are developing new firmware to improve the efficiency
of the trace feature and noise reduction which will be available as an update.
• When the LCD display is dimmed, it is a known that the display may appear to flicker.
This is due to the PWM control method employed.
• Strong signal breakthrough. Depending on the filtering in the transceiver or receiver,
alias signals can be seen and heard. The G90 in particular is known to suffer from
stations break-through and an external bandpass filter can resolve the issue.
• Xiegu IQ output: This is a very low-level signal and requires the external IQ amplifier to
work. The Xiegu pre-amplifier should be enabled to improve signal detection and
demodulation. If very strong signals are present, disabled the preamplifier if station
breakthrough occurs.
•
Circuit description of the Spectrum DSP:
The Spectrum DSP consists of one main unit and several optional additions: The main unit
contains the MCU (processor), memory, audio codec, various sensors and a separate LCD
touch display unit.
IQ amplifier: Provided as an external cable, providing 28dB of gain for low-level IQ output of
Xiegu, Elecraft and other radio equipment.
DC-DC convertor: Provides a high efficiency conversion of 8-18V DC to 5V DC as required by
the Spectrum and external audio amplifier.
Speaker amplifier: Provided as an external cable to provide a louder audio output to larger
speakers.
P 66
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