The NPR test is flawed because of its reference MDS.
MDS is measured using a STEADY carrier.
As soon as you modulate a weak signal carrier, it disappears in the band
noise of most DSP based receivers where analog systems still offer a
readable signal.
My measurements showed that analog receivers recover modulated signals at
5 - 8 dB lower levels.
*****try measuring MDS with modulated testsignals for a change *****
(a simple dit-dit-dit-dit as used in a S/N test-mode will do already)
My conclusion:
the MDS reference as a static benchmark does not resemble any real-life
situation.
The calculated NPR figure is thus flawed; it does not relate to any
intelligent radio communication reception.
73 Mark, PA5MW
<snip>
K9YC wrote:
The Noise Power Ratio Test is especially problematic --
<snip>
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