65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56 820027, Fax: +359 56 836700
E-mail: [email protected] ,Web: www.devabroadcast.com
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LEVELS PAGE
Enter the
Main Menu page
and select the
Level icon
, press
OK button
to enter the menu.
Levels page shows bar graph representation of the different signals, measured by DB7000.
The parameters are divided into groups. Each bar graph displays the low, average and high values
of the signal. The number in the center below represents the average value. The shaded color
number, placed on the left and right bottom edges, denotes the measurement range of the signal.
Measurement units and name of the signal are written above the corresponding bar graph.
Group 1. RF carrier related parameters
The
RF level
at the selected antenna input is measured in dBμV. The RF attenuation is included
in the level calculation.
The
Frequency offset
of the
RF carrier
is measured in kHz. This signal measures the misalignment
between the modulation and demodulation frequency. As the misalignment is expected to be small,
a large offset will indicate disturbance (for example adjacent channel breakthrough).
The Frequency offset is measured with better accuracy if there is no modulation of the carrier.
The usable range depends on the selected
IF filter bandwidth
. For better results, we recommend
the IF filter bandwidth to be manually set to 153 kHz.
The
Level of multipath
reception is measured in percents. The
multipath
detector measures
the amplitude fluctuations of the signal. The FM signal is broadcast with a fixed level; therefore
the level fluctuations will indicate degraded signal quality. At
multipath
conditions, large level
fluctuations can be measured. Install the antenna at the reception point with the lowest
multipath
level
in order to achieve better re-broadcast.
IF Bandwidth
- Shows the currently IF filter bandwidth.
