The insertion loss of DUT1 on 1296 measured with RTLSDR.
(March 10 2013)



Observed signal levels:
 none         DUT1
94.7171      94.6925
94.7249      94.6970
94.7314      94.7006

      averages 
94.7245      94.6967

There is an obvious drift with time that
we can see when subtracting the averages:
 -0.0074     -0.0042
  0.0005      0.0003
  0.0069      0.0039
There is an obvious drift with time.

The drift between two measurements of the same noise
level is about 0.0050 dB which means that the measurements
of DUT1 are too high by 0.0025 dB since they are all half
an interval later than the measurements of none.

The insertion loss of DUT1 is therefore:
IL = 94.7245 - 94.6967 + 0.0025 = 0.0303 dB

Correcting for the frequency drift we have
94.7171   94.6900
94.7199   94.6895
94.7214   94.6881

Standard deviations
  0.0022   0.0010
RMS sum of deviations
  0.0024

The standard error in the insertion loss is then 
0.0014 since it is based on 3 measurements

The measurement error (3 sigma) would then be 0.0042 dB.

Errors are estimated from too few data points so
the error estimation for this measurement is 
uncertain.