R&S®SML / R&S®SMV03 Test sequence
1147.7621.12 10.45 E-6
Error vector
Test set Test setup 6 vector modulation.
Measurement Instead of static measurement an equivalent dynamic measurement
with a low symbol rate is carried out.
Settings on R&S SMV03
Level 0 dBm
Select State IQ in the menu Vector Mod M.
Generate a modulation signal on the ARB generator using the
controller and the simulation program:
Modulation 16QAM
no coding
SQR COS-Filter with = 0.5
PRBS9 data sequence
Pulse width and oversampling 32
Length 100 symbols
Symbol clock 10 kHz.
Check if the channels on the ARB generator are equal and adjust if
necessary.
Make the corresponding settings on the demodulator. Synchronize
to abit sequence, starting with the 9
th
symbol, 12 bits long, result
length 80 symbols.
Vary the carrier frequency from 5 MHz to RF
max
.
For recommended setting values see Table 5-2 at least , *-
frequencies.
Measure the error vector magnitude (peak and rms) on the
demodulator.
Modulation frequency response
Test equipment Spectrum analyzer (Table 10-5, item 2)
signal generator (Table 10-5, item 5).
Test setup Connect the Rf output of the R&S SMV03 to the spectrum analyzer,
connect the signal generator to the I input of R&S SMV03.
Test method By applying a sinewave AC voltage to the I (or Q) input, an amplitude
modulation with a suppressed carrier is generated. The modualtion
frequency response is determined by measuring the sidebands as a
function of the frequency of the applied AC voltage.
Measurement Settings on R&S SMV03
Test level pegel 0 dBm, test frequency > 30.3 MHz
Select State IQ in the menu Vector Mod.
Settings on signal generator
level Pegel 0.5 V (V
peak
) corresponding to 4 dBm.
Settings on analyzer
Center frequency = test frequency, Span 30 kHz, RBW 10 kHz,
Reference level = test level + 6 dB Scale 2 dB/div.
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