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BURSTPWR METHOD Burst power, transient and
GATED METHOD Transient and random peak
Chapter 4
The characteristics of these two types
of power change differently with
resolution bandwidth changes, so they
can be computed algebraically from
measurements in two bandwidths.
The impulsive powers for all
frequencies within each adjacent
channel are converted to an equivalent
voltage. These voltages are assumed to
be in phase so they are added to
compute a peak voltage in the channel
and a peak power is computed. The
random powers are all added within a
channel to give a peak random power.
The peak random power is added to the
peak impulsive power to give a peak
weighted power.
random peak average power
measurement This method performs
a measurement and computation to
find the impulsive and random powers
similar to the two-bandwidth method,
but using a different and faster
technique.
It also uses an rms-responding
technique to compute a true power
ratio between the main and adjacent
channels, without peak weighting or
assumptions about phase relationships.
measurement for TDMA This
method is the same as the
two-bandwidth method except that the
random and impulsive powers are
separated using a different technique.
Gated video techniques are used to
measure the response of just the peak
of the random part of the adjacent
channel power. A TTL-type trigger
signal must be connected to the
spectrum analyzer to do this
time-selective gating.
Key Function Descriptions
Key Descriptions
251
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