Power Of An Is136 Tdma Signal - Rohde & Schwarz R&S FSP Series Operating Manual

R&S FSP
2.5.3.2 Measurement Example 2 – Measuring the adjacent channel power of an IS136
TDMA signal
Test setup:
generator
As the modulation spectrum of the IS136 signal leaks into the adjacent channel, it
makes a contribution to the power in the adjacent channel. Exact tuning of the
R&S FSP to the transmit frequency is therefore critical. If tuning is not precise,
the adjacent channel power ratios in the lower and upper adjacent channels
become asymmetrical. The R&S FSP's frequency and the generator frequency
are therefore synchronized.
Settings on the signal generator (e.g. R&S SMIQ):
Frequency:
Level:
Modulation:
Measurement with the R&S FSP
1. Set the R&S FSP to its default state.
2. Set up the R&S FSP for synchronization to an external reference frequency.
3. Set the center frequency to 850 MHz-
Press the FREQ key and enter 850 MHz.
4. Configure adjacent channel power measurement for IS136 signals.
2.34
RF Inp
Signal
FSP
Ext Ref Out
850 MHz
-20 dBm
IS136/NADC
Press the PRESET key.
The R&S FSP is in its default state.
Press the SETUP key.
Set the REFERENCE softkey to EXT.
Press the MEAS key.
Press the CHAN PWR ACP ! softkey.
Press the CP/ACP STANDARD softkey.
Select NADC IS136 from the list of standards and press ENTER.
The R&S FSP performs the power measurement in 5 channels (in the useful
channel and in the two upper and two lower adjacent channels).
Measurements on Modulated Signals
Ext Ref IN
Operating Manual 1164.4556.12 - 06
Getting Started