Spectrum DSP M2 User Manual V1.1
Additional comments:
• The audio (speech) processor is active on FM, but owing to the nature of FM communications
(e.g. low noise with good signals) “strong” compressor settings will likely result in audio that
sounds vary “processed.” Lower settings (e.g. “2”) are recommended when using FM.
• The squelch range is a bit “compressed” - that is, a there is not much difference in the low
number range for squelch adjustment (for weak/noisy signals) but only a small range for those
that are nearly full quieting. It is possible that at the maximum squelch setting that it will
"clamp" on audio peaks or may even fail to open at all, in which case one should reduce the
setting.
• The tone decoding is a bit slow to respond, particularly on the “release” when a tone
disappears – in which case a properly-set squelch will close the audio gate. This is an artifact
of the need for narrow bandwidth detection, the need to validate the tone detection to prevent it
from “bouncing” and also the limited amount of processing power available to do the tone
decoder processing.
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