Specifications

Setting and Using the Measurement Functions R&S FSH
1145.5973.12 4.54 E-10
ANALOG TV mode:
In the ANALOG TV operating mode, the maximum power in the reference channel is measured. It is
then used as the carrier power (reference) for determining the carrier-to-noise ratio.
To measure the peak power of the vision carrier, the settings for span, resolution bandwidth, video
bandwidth and sweep time are optimally preset by the R&S FSH.
If you want to change the settings, note the following:
• The span is preset to the channel bandwidth of the reference channel. The span is coupled to the
channel bandwidth. When changes are made, the R&S FSH automatically sets the appropriate
span.
• The resolution bandwidth should be at least 300 kHz to ensure that the peak power of the vision
carrier is sampled.
• The video bandwidth must be at least as wide as the resolution bandwidth. This prevents incorrect
results due to the compression of signal peaks by the video filter.
• The peak detector is recommended. It ensures that the peak power of the vision carrier is correctly
measured.
• The sweep time is coupled to span, resolution bandwidth and video bandwidth. Set the sweep time
in such a way that the filters can settle. Too short a sweep time distorts the measurement result.
¾ Press the SELECT MEASURE softkey.
The menu for selecting the reference measurement
opens.
¾ Using the rotary knob or the cursor keys, select
ANALOG TV and confirm your choice with the
ENTER key or the F1 softkey.
The R&S FSH starts the ANALOG TV reference
measurement. C/N-ATV is inserted in the top right-
hand corner of the display. Reference channel and
channel bandwidth are set in accordance with the last
ANALOG TV reference measurement.
In the ANALOG TV operating mode, the count marker is automatically activated. After each sweep, the
marker is set to the highest power in the reference channel. Marker power and marker frequency are
indicated at the top edge of the display. The marker power corresponds to the reference.
CW Tx mode:
In the CW Tx operating mode, the maximum power in the reference channel is measured, which is then
used as a reference for determining the carrier-to-noise ratio.
The settings for span, resolution bandwidth, video bandwidth and sweep time are optimally set by the
R&S FSH.
If you want to change the settings, note the following:
• The span is set and coupled to the channel bandwidth. When changes are made, the R&S FSH
automatically sets the appropriate span.
• The resolution bandwidth is coupled to the channel bandwidth. When changes are made, the
R&S FSH automatically sets the appropriate resolution bandwidth.
• The video bandwidth of the recommended peak detector must be at least as wide as the resolution
bandwidth. If the RMS detector is used, the video bandwidth must be at least three times the
resolution bandwidth. This prevents incorrect results due to the compression of signal peaks by the
video filter.