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7-5 Operation Mode Summary
The following is a summary of the operation mode of the SDU5600. A proper mode should
be selected according to your applications.
Mode
Spectrum Analyzer Mode
Step Resolution Mode
Channel Scope Mode
8 Special Considerations
Electrical performance
Unlike an ordinary spectrum analyzer, your SDU5600 is designed to operate in conjunction
with a companion receiver as a complete system. Therefore, you are reminded of the
following points:
Displayed signal level
The signal level which the SDU5600 provides is always the RF input of the SDU5600, NOT
the signal level at the receiver antenna input.
Frequency characteristics
While multiple active signals are simultaneously displayed, you may notice that a received
signal changes positions (i.e. a strong signal is displayed weaker and a weaker signal
is displayed stronger in comparison), particularly when the receiver is tuned around multiple
strong signals. This is caused by the receiver's RF filters, IF filters, etc. which result in non-
linear amplification over the wider frequency range. This is particularly noticeable when a
wide span is selected (such as 10 MHz), the extreme edge of the screen may show a
reduced signal level by as much as 10 dB (when AR3000A receiver is used). This is,
however, not a fault. This has to be taken into account when a comparison of signal level is
required.
Overload to the receiver
Features
Default operation mode.
Best for generic measurements.
Required settings: Center Frequency, Span
Best for measurement of signals which have
a known frequency step.
Required setting: Frequency step
Best for measurement of signals which have
a known frequency allocation.
Required settings: Start Frequency,
End (Stop) Frequency
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