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4.10.1.10 Bandwidth of the Spectrum Measuring Filter (Measure
bandwidth)
The frequency resolution of the Spectrum Analyser mode is determined by the
bandwidth of the measuring filter when displaying the spectrum. This parameter is
fundamental given the increasing density of channels present in all TV transmission
systems.
To alter the bandwidth of measurement select the Spectrum Analyser functions
menu, then turn the rotary selector [4] to the Measure bandwidth function and press.
The screen will show a window displaying the values which can be selected. Turn the
rotary selector [4] to the chosen bandwidth and activate it by pressing the selector
again.
The choice of bandwidth is:
Terrestrial channels:
Satellite channels:
Filters with the greatest bandwidth (4 MHz y 1 MHz) allow you to take more
stable measurements, as well as being able to distinguish between analogue and digital
carriers. The 4 MHz filter is ideal for level measurements on the satellite band. The
230 kHz filter is recommended for measuring terrestrial television, cable television and
MMDS signals. It also allows you to identify smaller bandwidth signals such as NICAM
sound carriers (terrestrial analogue channels), to detect the beacon signal on VSAT, the
separation between the audio FM carrier, and between the stereo sub-carriers in
television.
4.10.1.11 Selecting the Channels Table (Channel set)
See 4.9.4.7 section.
4.10.1.12 Batteries and External Units Power Supply (Battery & Lnb)
See 4.9.4.3 section.
4.10.1.13 Exit
Exits from the Spectrum Analyser function menu.
4.10.2 Selecting the Measurement Mode
The Spectrum Analyser mode permits to make different measurements at the
same time you see the signals present in the band. The types of measurements
available are:
Page 82
USER'S MANUAL. PROLINK-4C
230 kHz or 1 MHz
230 kHz or 4 MHz
02/2003
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