4-6 Chapter 4
Making GSM Air Interface Measurements
Making the Out-of-Band Spurious Measurement
Making the Out-of-Band Spurious
Measurement
Purpose
This measurement verifies the operation of the transmitter by
measuring the spurious signals created outside of the transmitter band
specified by the selected standard and tuning plan.
Measurement Method
This out-of-band spurious measurement first measures the channel
power as defined by the selected standard and tuning plan. Then out of
band frequencies are scanned and spurious responses are measured in
accordance with the standards documents. If a carrier is not present,
the measurement runs and the message “Carrier Not Present” is
displayed.
Although the standards documents specify that frequencies up to 12.75
GHz are scanned, not all ESA models are equipped to measure at these
frequencies. In such cases, frequencies up to the maximum range of the
analyzer are used.
NOTE Care needs to be taken if you are making measurements with a carrier
power close to or above 30 dBm. We recommend that you use a fixed
attenuator and a 1dB step attenuator and use the step attenuator to
optimize the noise floor to the limit line margin.
Making the Measurement
1. Press the Measure key.
2. Press the
Out Of Band Spurious key.
Factory default parameter settings provide a GSM compliant
measurement. For special requirements, you may need to change
default settings:
• Mode setup and frequency/channel parameters.
Use the
Mode Setup and Frequency Channel keys to change these
parameters for all measurements made within the current mode. For
further information refer to Chapter 1 of this document.
To Next Page
Loading...
Need help?
General
