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Feature Descriptions MDM6000 Satellite Modem
The link margin clipping will indicate "<" or ">" when the link margin value is too low
or too high to be accurately determined.In case it is too low, the link margin might be
too low in order for the detector to operate correctly.With the link margin too high,
there might not be enough decoding errors in order for the detector to display a
meaningful value.
Please note that during the lock acquisition phase the monitoring statistics display
irrelevant data due to different lock attempts on different ModCods.
After 5 seconds of stable lock conditions the statistics are reset automatically. After
this reset the statistics show valid data.
14.6.16 External Converter
MDM6000 >> Demodulator >> External Convertor
This feature allows the user to see the actual RF input frequency used to receive the signal.
Depending on the spectral inversion the L-band Input Frequency is calculated as explained in the
following sections.
14.6.16.1 Direct Spectrum
Input Frequency = RF Frequency - LO Frequency
For example
Note, the data used in this example is taken from a standard LNB.
• When using a Ku-band LNB with LO = 10 GHz and a receive band of 10.95 to 11.80 GHz, the
resulting L-band frequency (noted as the demod's "Input Frequency") will be in the range of 11.8
GHz - 10.0 GHz = 1800 MHz and 10.95 - 10.0 GHz = 950 MHz
In this case the
Input Frequency = RF Frequency - LO Frequency and the spectrum will be direct (because the
LO is lower in frequency as the received frequency).
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