Sjoerd,
When measuring millivolts some voltmeters are not very accurate. I've seen
them err as much as 40-50 percent. Compare two or three meters and see the
results. Also, some crystals don't put out a pure sine wave making RMS
measurements less acccurate. Look at it on an o'scope if one is available
and calculate the RMS from the waveform on the screen. When working with
millivolts there are a lot of factors that can affect accuracy that are less
of a problem when measuring higher voltages.
Just some observations. Hope you get it working soon to your satisfaction.
Jim, AB0UK
K2/100 S/N 4787
- Crystal filter output seems quite low, it reads 0,17 Vrms, instead of the
given 0,35V .. tried this with different BFO settings, no significant
difference. The input of the filter is about 2,15 Vrms with a jumper over
the NB connector (5 dB more than normal)
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