Technical data

Chapter 16 451
Spectrum Analyzer
Using the Spectrum Emission Mask Measurement
Spectrum Analyzer
NOTE 1xEVDO SEM measurements are made under two conditions. These are:
• Continuous Data mode, that is, with no idle slots.
• Idle mode, that is, with all slots idle except the control channel
Your E7495A or E7495B test instrument can only make SEM measurements for the
first condition, that is, in Continuous Data mode
To make an SEM measurement, the power level limits at different frequency offsets
need to be specified. These power limits vary between different channel standards,
but have all been predefined for you. These limits are listed in the two tables below.
The first table shows the limits for CDMA and 1xEV-DO standards, and the second
shows WCDMA UTRA standards.
For all possible channel standards for which you can make an SEM measurement
(see the table above), the power limits have been predefined and will be displayed
on the screen as a stepped yellow line. This line is known as the ‘mask’. If you
attempt to make an SEM measurement for a channel standard that does not support
SEM measurements, no mask will be displayed, and the message, “SEM
Measurement does not support the selected Channel Standard” will be displayed on
the bottom of the test instrument’s screen.
8 1800 MHz Band 1800 MHz CDMA SEM Not
Supported
9 900 MHz Band 900 MHz CDMA SEM Not
Supported
10 Secondary 800 MHz
Band
Secondary 800 CDMA Yes
11 400 MHz European
PAMR Band
400 MHz European
PAMR
SEM Not
Supported
12 800 MHz PAMR Band 800 MHz PAMR SEM Not
Supported
Band
Class
Band Name (Applies to
CDMA and 1xEV-DO
Only)
Channel Standard
Name (Applies to
CDMA and 1xEV-DO
Only)
SEM
Measurements
Supported?