Interface Configuration and Interpretation
Input Card Screen - 8PSK
The following LES indicators are available in the Readings section of the screen:
RF Lock | Indicates when the RF reciver sections are in lock and receiving |
| normally. |
FEC Lock | Indicates when the Forward Error correction ( DVB or turbo |
| coded) is in lock and the data is being processed to give |
| Transport Streams. |
The following graphs are available when the 8PSK interface card is installed:
Figure
Constellation I and Q data are collected from the QAM front end and displayed as a conventional constellation of 256 points by 256 points. The samples collected are not real time, so there is some dwell (delay) before a complete constellation is displayed. The persistence of the display can be varied using the Persist slider control at the bottom of the graph.
MER and EVM calculations are performed on the constellation data according to the formulas given in
MTM400 MPEG Transport Stream Monitor User Manual |
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