Rohde & Schwarz SME02 - FFSK Modulation; LF Generator (Option SM-B2); Frequency Error

SME Test Procedure
1038.6002.02 5.37 E-13
5.2.36 FFSK Modulation
Test equipment Test system 5.1.1.1
Measurement À Settings at the SME
- Carrier frequency 466 MHz,
- Level 0 dBm,
Select SOURCE DATA, MODE AUTO, SELECT STANDARD
POCSAG in the DIGITAL MOD/FFSK menu.
À Enter a "HIGH sequence" ("1") using the list editor.
À Setting at the modulation analyzer
- Demodulation FM
- Lowpass filter 23 kHz.
Demodulated signal........................................................... sinusoidal
....................................................... Peak deviation of 4 kHz ±3 %
........................................ Modulation frequency of 1200 Hz ±3 %
Distortion factor .......................................................................<1 %.
À Enter a "LOW sequence" ("0") using the list editor.
Demodulated signal........................................................... sinusoidal
............................................................. Peak deviation 4 kHz±3%
.............................................. Modulation frequency 1800 Hz±3%
Distortion factor .........................................................................<1%
5.2.37 LF Generator (Option SM-B2)
5.2.37.1 Frequency Error
Test equipment Audio analyzer (Section 5.1, item 14)
Test setup Connect the audio analyzer to the LF socket of the SME.
Measurement À Settings at the SME
In menu LF OUTPUT
- SOURCE LFGEN2,
- VOLTAGE 1V,
- Vary LFGEN2 FREQUENCY from 20 Hz to 100 kHz.
À Read off the actual frequency at the audio analyzer
Deviation from the rated value..................................................<1E-4
À Read off the distortion factor at the audio analyzer.
Rated value.............................................................................< 0,1%
À Settings at the SME
In MENU LF OUTPUT
- LFGEN2 FREQUENCY 1 kHz
- Vary VOLTAGE from 1 mV to 4 V
À Measure the output level using the audio analyzer.
Deviation from the rated value................................ max. 1% + 1mV.
Recommended settings 3 mV, 10 mV, 30 mV, 100 mV, 300 mV, 1 V, 2 V, 4 V