Satellite Transponder Parameters Measurement In The Mer/Ber Mode - Planar IT-100 Operating Manual

4.4.4. Satellite Transponder Parameters Measurement in the MER/BER Mode

In this mode the measured DVB-S/S2 signal quality parameters are displayed on the
screen in figure form and in the form of vertical bars. It also features a constellation
diagram measurement mode. The screen view of this mode is shown in figure 4.33
The following is displayed on the screen:
7) IF. Transponder tuning frequency (IF) and locked transponder frequency offset
relative to tuning frequency;
8) P. Transponder power;
9) MER. MER value;
10) MARGIN. MER margin to quasi error-free reception threshold;
11) UPTIME. Transponder measurement duration;
12) CBER. BER before Viterbi decoder (for DVB-S), or before LDPC decoder (for
DVB-S2);
13) VBER/LBER. BER after Viterbi decoder (for DVB-S), or after LDPC decoder (for
DVB-S2);
14) PER/CNT. Erroneous packets error rate and total erroneous packets number.
On the left of the screen MER and BER values are displayed in a form of a histogram
with markers of minimal and maximal values detected during all the measurement time.
At the top you can see informational panel (figure 4.30) operating mode settings and
locked transponder parameters.
To set up transponders, use the ◄ and ► keys. When holding pressed Shift key
transponders will be scrolling with a higher pitch value. To enter transponder frequency or
symbol rate, use the alphanumeric keys. Confirm entering with one of the following keys:
6) F1 / IF. Intermediate frequency is specified. Current polarization will not changed;
7) F2 / TF, H/L. Satellite band frequency is specified and horizontal/left-handed
circular polarization selected;
8) F3 / TF, V/R. Satellite band frequency is specified and vertical/right-handed
circular polarization selected;
9) F4 / SR. Transponder symbol rate is specified;
10) ENTER. Satellite band or intermediate frequency is specified (detected
automatically). Current polarization will not changed.
To access the mode settings, press the F1 / Settings key. The following settings are
available:
9) Ref. level. Selecting reference level value. Available values 50 to 120
dBuV and Auto. The setting resolution 10 dB. The
parameter sets up the maximum possible measured signal
Figure 4.33
46
level.