R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Getting Started
Measurements on Modulated Signals
The R&S SMIQ has to be equipped with options R&S SMIQ-B10 or R&S SMIQ-B20
(modulation coder) and R&S SMIQ-B11 (data generator).
Option R&S SMIQ-Z5 is required to trigger the R&S FSQ. This option is connected
to the R&S SMIQ’s parallel output port. The BNC output Trigger 1 of the R&S SMIQ-
Z5 provides a TTL trigger signal on the rising edge of the IS136 burst, which is used
to start the R&S FSQ sweep in the Gated Sweep mode.
The R&S FSQ’s IF power trigger is not suitable for IS136. It triggers on every
level edge of the input signal. Since the modulation of the IS136 signal causes
level dips even during the transmit burst, there is no way of ensuring that the
R&S FSQ is only triggered on the burst edge.
Settings on signal generator R&S SMIQ
Switch the signal generator to the IS136 burst mode (time slots 1 and 4 are switched
on, the other time slots are switched off).
The R&S SMIQ is set as follows to generate the signal:
1. Press the PRESET key.
2. Press the FREQ key and enter 850 MHz.
3. Press the LEVEL key and enter -20 dBm.
4. Press the RETURN key.
5. Select DIGITAL STANDARD using the rotary knob and press the SELECT key.
6. Select NADC using the rotary knob and press the SELECT key.
7. Press the SELECT key.
8. Select ON using the rotary knob and press the SELECT key.
9. Press the RETURN key.
10.Keep turning the rotary knob until SAVE/RECALL FRAME appears in the list and
select the menu item SAVE/RECALL FRAME using the SELECT key.
11.The cursor is set to GET PREDEFINED FRAME.
12.Press the SELECT key.
13.Select UP1TCH using the rotary knob and press the SELECT key.
In the following operating sequence for the R&S FSQ, it is assumed that steps 1 to 6
of 2.5.3.2“Measurement Example 2 – Measuring the Adjacent Channel Power of an
IS136 TDMA Signal” on page 2.39 have already been performed.
Configuring the Gated Sweep function on the R&S FSQ
➢ Press the TRIG key.
➢ Press the GATED TRIGGER softkey.
➢ Press the EXTERN softkey.
➢ Press the GATE SETTINGS � softkey.
The R&S FSQ switches to time domain measurement so that the setting of the
Gated Sweep parameters can be checked visually.
➢ Press the SWEEPTIME softkey and enter 10 ms.
Exactly one TDMA burst will be displayed.
Operating Manual 1313.9681.12 - 01 2.43