Rohde & Schwarz FSQ series, Quick Start Manual

Page: 44 / 229

R&S FSQ Front and Rear Panel
Rear Panel Connections
1.16 Quick Start Guide 1313.9652.62 - 02
20.4 MHz IF Output (IF OUT 20.4 MHz)
The 20.4 MHz IF signal of the R&S FSQ is provided at the 20.4 MHz OUT female BNC
connector. For resolution bandwidths between 100 kHz and 10 MHz, the bandwidth
corresponds to the selected bandwidth. For bandwidths
≤
100 kHz, the bandwidth of the output
is equal to 2.6 * resolution bandwidth, where the minimum value is 2.6 kHz (non-FFT). In the
analyzer mode, the level at the IF output in the case of a signal at the reference level is 0 dBm
if the resolution bandwidth is
≥
100 kHz; if the resolution bandwidth is <100 kHz, the level is
-10 dBm (for mixer levels
≥
-60 dBm).
404.4 MHz IF Output (IF OUT 404.4 MHz)
The 404.4 MHz IF signal of the R&S FSQ is provided at the 404.4 MHz OUT female BNC
connector.
Video Output (VIDEO OUT)
In analyzer mode, the voltage of the analog detector (video) is output via the BNC connector
VIDEO OUT.
The video signal is unfiltered, i.e. the video bandwidth (VBW) setting on the instrument has no
effect on the video output. The usable video bandwidth is limited only by the set resolution
bandwidth (RBW) to approximately ½ * RBW.
The output voltage is always logarithmic, independent of the selected scaling on the display.
Likewise the selected detectors (e.g. RMS) affect only the display but not the video output. The
output impedance is 50
Ω
. All subsequent voltage values are typical values and apply to the
output without load.
With RBW = 100 kHz as well as with all root raised cosine (RRC) and channel filters no video
signal is available.
RBW 200 kHz to 10 MHz
Output voltage at signal level = reference level: 1.8 V
Slope14 mV / dB
Exception: Ref_Level / dBm - RF_Attenuation / dB < -50
Output voltage at signal level = reference level:
1.8 V + (Ref_Level / dBm - RF_Attenuation / dB + 50) * 14 mV
Use suitable double shielded cables.