WiNRADiO G65DDC User’s Guide
94
For SINAD and THD measurements, the test frequency is assumed to be 1
kHz.
Note that this function is also duplicated by the information button
in
the demodulator spectrum DDC2 scope “toolbox”.
Show Data Rates
The Show Data Rates display shows the various internal data rates of the
entire G65DDC receiver system. This may be useful especially for debugging
of installation problems:
Of particular interest to many users will be the
CPU load
(excessive CPU load
may cause sluggish behavior or freezing of the computer), and
Audio latency
.
Apart from
DDC1 bandwidth
, CPU load may be minimized by reducing the
Demodulator filter length
(thus sacrificing selectivity) and audio
latency may be minimized by reducing the
Audio buffering
(while inviting the
possibility of audio drop-outs or distortion). Both these controls are available
under
Options
.
Note that this function is also duplicated by the information button
in
the DDC1 spectrum scope “toolbox”.
Measuring your Excalibur Sigma’s sensitivity using your Excalibur Sigma:
Using the SINAD measurement facility, you can measure the sensitivity of the
WiNRADiO Excalibur Sigma receiver very easily. All you need is a calibrated
signal generator. For example, to measure AM sensitivity, connect the signal
generator to the antenna input and turn on AM modulation (the modulation
depth is usually set to 30%, although some manufacturers prefer to quote
sensitivity figures at higher modulation depths, for example 60 or 80%). Set
