NARDA IDA - Page 103

6.4 Setting the bandwidth (RBW / CBW)
Narda IDA-3106 95
To set the resolution bandwidth or channel bandwidth:
1. Press the BW softkey.
2. Use the rotary control knob to select the desired value and
press the OK key.
 The selected value is applied.
Background information:
Gaussian filters are used to display differing signal spectrums. The
desired frequency range is set using Fcent / Fspan or Fstart / Fstop and
then swept at a relatively small RBW (e.g. Fspan/500) in order to capture
the actual spectral form of the signal selectively. Gaussian filters are
particularly suitable for such rapid and dynamic actions. Bandwidths from
10 Hz up to 20 MHz are available. The Gaussian filters are used in Multi
Channel Power mode to generate steep cutoff filters of any width. This is
done by overlapping the appropriate number of Gaussian filters.
Channel filters are used to measure the overall power of a signal. The
analyzer is tuned with Fcent to the fixed center frequency of the signal.
After this, CBW is adjusted as closely as possible to the signal
bandwidth. Bandwidths from 100 Hz up to 32 MHz are available.
Mode BW Filter type
Spectrum
Multi-Channel Power
Direction Finding
Level Meter
Time Domain (Scope)
I⁄Q Analyzer
RBW
RBW
CBW
CBW
CBW
CBW
Gaussian
Gaussian
Steep channel filter
Steep channel filter
Steep channel filter
Steep channel filter