Technical data

120 Chapter 3
1xEV-DO Analyzer and Over Air Test
Codogram Display
1xEV-DO Analyzer and Over Air
Test
Codogram Display
Switching to the Codogram view adds the third dimension of time to the display.
That is, you can view code domain power (sorted by either MAC Index or be Walsh
Code) over time. MAC Indexes or Walsh Codes are displayed against the horizontal
X-axis, time is represented on the vertical Y-axis, and signal strength is indicated by
the color - low power signals are represented by the cooler, blue end of the
spectrum, and high power signals by the warmer, red end of the spectrum.
The codogram plot rises over time until it fills the graphical section of the display.
Your most recent data appears at the bottom of the display, and your oldest data
(several minutes ago to several hours ago, depending on your settings) appears at the
top of the display. In this way, you can clearly see the changes in power that occur
over a period of time.
The
Update Interval is the interval, measured in whole seconds, between successive
records displayed on the codogram. In other words, if you set the update interval to
5 seconds, the codogram display will not update until the after the first complete
measurement following a gap of five seconds. Alternatively, you can set the update
interval to provide the maximum data collection speed by pressing [Max Speed], or
by setting the update interval to 0 (zero) seconds.
NOTE It is not always possible for the analyzer to match the update interval you specify. It
is possible, for example, to set your update interval to zero seconds (the maximum
speed), and then to find that the analyzer can not update any faster than once every
two seconds.
You can clear your screen and start a fresh codogram display by pressing the Reset
Codogram key. Changing the units of the X-axis (for example, by changing CDP
Type, or by switching from MAC to Walsh Code) also clears and resets the
codogram.