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and AMP manually should be avoided, whereas under poor electromagnetic
environment or using a outdoor antenna, the REF, ATT and AMP settings
should be combined properly according to the spectrum. REF is still relevant
while using manual setting, because REF is ganged with IF gain. The
interference resistance level at highest gain is given in the technical parameter
chart.
The anti-interference characteristics of these two ports are different.
Normally it's recommended to use the right side port. And the left side port
should only be used when there's no demand for anti-interference
performance.
All amplifiers and attenuators have been calibrated in advance, and
recalibration would be done automatically once the setting is changed. For
example, adjustments in a certain frequency makes the total gain decreases by
25.8dB, in this case the raw data would be increased by 25.8dB as
compensation to ensure the tested signal remains the same.(Prerequisite: the
tested singal must be stronger than the background noise.) Yet the
background noise would be constantly changing, it would drastically rise as
the sensitivity of the machine drops. However, because the noise from the
amplifer would also drop relatively, the background noise would not increase
exactly 25.8dB, but a slightly smaller value.
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