WiNRADiO G315 User’s Manual
61
There are three spectrum sweeping facilities:
Spectrum
Analyzer
,
Activity Monitor
and
Logger
. These are
selectable using tabs at bottom left of the sweep window.
The
Spectrum Analyzer
function is similar to a conventional
spectrum analyser. The
Activity Monitor
function makes it
possible to monitor activity on a given frequency band, including channel
occupancy measurements. The
Logger
function can perform long term signal
strength logs on individual selected channels.
Spectrum Analyzer
To set up spectrum sweeping, enter the
Start
and
End
frequencies to specify
the start and end of the sweeping range, respectively. Alternatively, you may
enter the
Center
and
Span
frequencies.
Next select the
RBW
(
Resolution Bandwidth
), which determines how detailed
the spectrum will be (the lower the RBW, the finer the detail). The finest RBW
is 15.625 Hz. The RBW has a proportional effect on the spectrum sweeping
speed, i.e. the greater the RBW, the faster speed, but at the expense of detail.
The
VBW
(
Video Bandwidth
) is a low-pass filter which is applied to the
resulting “video” trace of the signal and makes it possible to smooth the trace.
The lower the VBW, the smoother the trace. This setting has the same effect
as the Video Filter in the demodulator panel.
The spectrum analyzer, when activated, disables the AGC. This is in order to
have a uniform gain for the entire scanning range – if the gain was changing
due to the AGC action, the spectrum trace would be distorted (stronger signals
would appear weaker, and weaker signals would appear stronger). The
Gain
control (adjustable from 0 to 99 dB) is used to set the IF gain for the spectrum
analyzer.
