The filters in WRplus 1.03
(Jan 4 2011)
Test method.


When the test file is played with WRplus-1.03, the screen may look like figure 1. It depends of course how the parameters in WRplus are set.

Fig 1. WRplus-1.03 running sim1.wav.

The loudspeaker output from WRplus-10.3 sounds like this: sim1-wrplus.mp3 (558600 bytes.) The on-off keyed signal is at a level that is similar to the noise floor level in the beginning and end of the file where the data comes from an old Perseus recording.

There are many spurs. WRplus-1.03 is not quite good enough to match modern hardware. Much better than Winrad however.

The details of the loudspeaker output are shown in figures 2 and 3 which are waterfall graphs produced by Linrad with sim1-wrplus.mp3 as the input (before conversion to mp3).

Fig 2.The loudspeaker output from WRplus-1.03 when running the test recording sim1.wav. This waterfall graph is produced by Linrad with the loudspeaker output from WRplus-1.03 as input.

Fig 3.The loudspeaker output from WRplus-1.03 This the same as figure 2 at a 10 times higher waterfall speed. The time when the signal sweeps across the passband is well visible as well as a couple of fairly weak spurs.

The loudspeaker output of WRplus-1.03 on an oscilloscope looks like figures 4 and 5 at different X-axis magnification.

Figs 4 and 5The loudspeaker output from WRplus-1.03 in the time domain when the signal sweeps across the filter.

It is obvious that WRplus-1.03 does not have the dynamic range to cope with the signals in the test file. WRplus-1.03 will not allow using the full potential of modern receiver hardware.

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