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2. OPERATION
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Fig. 2.10. Complete four-chart plot corresponding to the four directions of
modulation available on the QR 2009 obtained with the
set-up
of Fig. 2
..
2.
Synchronous filtering was only switched in when measuring signals below
the wide band surface noise level. Note that the switching-in of the first filter
occurs
exactly
at 22.4 Hz (proper positioning of the synchronizing gear of
the 2305).
Examples of Measuring Results.
The two plottings of the individual channels characteristics are usually made
on the same chart
and
superposed with
each
other for easy comparison and
26
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