Gsm Channel Power Measurement - Anritsu MS2024A/MS2026A User Manual

4-12 GSM Channel Power Measurement

4-12 GSM Channel Power Measurement
Global Systems for Mobile (GSM) communication is a globally accepted standard for digital
cellular communication. There are a number of frequency bands allocated to GSM mobile
phones that use a combination of Frequency Division Multiple Access (FDMA) and Time
Division Multiple Access (TDMA). Within each band are approximately one hundred
available carrier frequencies on 200 kHz spacing (FDMA), and each carrier is broken up into
time-slots so as to support eight separate conversations (TDMA). GSM uses the Gaussian
Minimum Shift Keying (GMSK) modulation method.
Required Equipment
• MS203xA VNA Master
• Test Port extension cable, Anritsu 15NNF50 - 1.5C
Procedure
1. Using the test port extension cable, connect the signal source to the
Anritsu MS203xA VNA Master.
2. Press the
Amplitude
. Adjust the values given in this procedure to match your measurement
–20 dBm
conditions.
3. Press the
Scale
4. Press the
BW
5. Press the
Freq
using the rotary knob or Up/Down arrow keys to highlight the GSM900 standard for
the measurement and press
6. Press the
Channel#
keys, or the rotary knob. For this example, select Channel 60.
7. Press the
Shift
8. Select the
Center Freq
set to that of the GSM signal, in this case 947.0 MHz.
9. Select the
Int BW
integration bandwidth appropriate for the particular application.
10. Select the
Span
to a value appropriate for the particular application.
11. Make the measurement by pressing the
measurement results in the message area.
Channel Power is a constant measurement. After it is turned on, it will remain on
Note
until it is turned off by pressing the
4-10
key and select the
soft key and set the scale to
key and verify that
key followed by the
Enter
soft key and enter the channel number using the keypad, the arrow
key then the
Measure
soft key and verify that the center frequency of the VNA Master is
soft key and enter 200 kHz for the integration bandwidth, or set the
soft key and enter 800 kHz as the channel span, or set the channel span
soft key to set the reference level to
Reference Level
10 dB/division
and
RBW Auto VBW Auto
soft key. Scroll through the dialog box
Signal Standard
.
(4) key and press the
soft key. The MS203xA displays the
Measure
soft key again.
On/Off
MS20xxA VNA Master UG 10580-00166 Rev. C
Chapter 4 — Spectrum Analyzer
test port of the
RF In
.
are .
On
soft key.
Channel Power