65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56 820027, Fax: +359 56 836700
E-mail: [email protected] ,Web: www.devabroadcast.com
- 38 -
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 DB7007. 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.
The
Multipath
reception level is measured in % (percents). The multipath detector measures
the amplitude fluctuations of the signal. The FM signal is broadcasted with a fixed level; therefore
the level fluctuations will indicate degraded signal quality. At multipath conditions, large level
fluctuations can be measured. To achieve better re-broadcast, install the antenna at the reception
point with the lowest multipath level.
IF Bandwidth
– Shows the current IF filter bandwidth.
