Optional DSP Unit

DavidN has kindly sent in some samples (WAV format) of the optional internal DSP unit in action - thanks David
To listen either save the link to disk, or open the .WAV file to a player

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WAV Files Demonstrating the DSP Unit
David writes: -
It's suggested that the WAV player to play these samples is put on repeat play, so that the end and beginning of each sample can be compared too.

SWITCH ON : The effect of just switching on the DSP unit, on a quiet channel - AM, 6kHz filter. It'll be noticed that by just switching on the unit it adds the effect of a filter.

MULTIPATH : The effect of switching on the DSP unit on a multipath-distorted signal - AM, 6kHz filter. As soon as the DSP unit is switched on it can be heard to clean away all the multipath distortion. Unfortunately this file has to be a large size to have the bandwidth to hear the distortion.

HETERODYNE ON OWN : The effect of the NOTCH filter can be clearly heard being switched in and out on a clear frequency.

SLIGHT HETERODYNE : The DSP unit either doesn't seem to want to lock on to this slight heterodyne, or loses lock during a fade and doesn't regain lock. The NOTCH filter was switched in after about 2 seconds into the recording - AM, 6kHz filter.

HEAVY HETERODYNE : VOLMET UK here on AM and a 6kHz filter, and the NOTCH filter locks on nicely.

NOISE SWITCHED Example 1 : Effect of the NOISE filter, set previously at optimum for this signal - AM, 6kHz filter.

NOISE SWITCHED Example 2 : As NOISE SWITCH 1, except on an 20m amateur signal - SSB, 2.8kHz signal.

NOISE : Again, an amateur SSB signal with 2.8kHz filter, but this time pretty weak. The NOISE filter was already set on, but the slider set to no effect. From the start of the recording the slider was moved progressively from no effect to maximum. The voice going through several good 'nodes' along its travel can be heard.