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span. e.g, the noise floor is still as low as -120dBm(Avg), with 1GHz span. At
this time, the residual responses in the entire span are at a glance. On the
other side, the noise floor is usually as high as -80dBm with traditional
scanning spectrum with 1GHz span, which is enough to cover all the residual
responses.
While using a narrower SPAN (such as receiving mode), the noise floor is
often as low as -130~-140dBm, and the internal leakage interference will
become easy to notice. Considering the size of KC908 is too small to isolate, it
is recommended to keep the antenna away from the body of instrument to
reduce interference.
What's more, occasionally there will be a relatively large residual response
at 9.800GHz,
yet since the residual part is fixed, it's quite easy to notice.
6.6 Why is there an overload occurred even the signal has
not exceed REF?
Real-time spectrum analyzers are usually only equipped with wide analog
filter. The signal in the entire filter passband will be sent to the post stage,
resulting in a quite high total power level. If there are lot of signals in
passband, there will be a situation where the peak of the spectrum hasn't
overflowed, but the sum of the signals has already overloaded.
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