In a message dated 16/04/2005 23:11:05 GMT Standard Time, r@somis.org writes:
Which is why accurate readings are done with a calibrated step
attenuator - using the S-meter only as a relative indicator.
But what is the resolution of the S meter? Most S meters have S9 at half
scale. At the nominal 6 dB/S point, that's a 54 dB range, or to read any
difference to 1dB requires reading the meter to better than 1%. Note this
nothing to
do with accuracy - merely resolution. On a big 6 inch scale meter, maybe -
and that's always assuming that there's no hysteris.
However, it's well known that the ionosphere can be non linear. The
'Luxembourg Effect'.
73
Peter G3RZP
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