Meaning of the symbols on the 3-digit display
Left display: decoder type and sync-info
| HRPT | CHRPT | MHRPT1 | MHRPT2 | METOP | Feng-C | Feng-A,B
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In-sync
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Out-sync
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Left display: New decoder type and sync-info
| HRPT | NOAA20 | NOAA21 | MHRPT2 | METOP | Aqua | Feng-A,B
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In-sync
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Out-sync
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Middle display; J7 open
Segments a and d
With 'real' (bit noisy signal) the 2 segments will flip
or even show one state, although in-sync. Not a perfect detector...
VCO
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too low | too high | in-sync
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Segments b and c
QPSK only.
Viterbi-sync. With good signal this should be stable. Doesn't matter which state.
Segments e and f
QPSK only, from version 7 on
For Fengyun: Viterbi-sync Q.
Not-QPSK, or version 5 and earlier.
Set by jumper J5
Right display: data buffer state; J7 open
Stopped | Fill 0-25% | Fill 25-50% | Fill 50-75% | Fill 75-100% | Full
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Display 2,3; J7 set: Quality signal
displ | meaning | comment
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00FF | perfect quality | higher value= lower quality; decoder must be in-sync
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Other use of display
Note: This feature is switched off, but it's a matter of software to enable (the FPGA contains the logic).
Instead of the mentioned info the display may also show elevation/azimuth or X/Y
in a loop:
- Normal display as describe above
- elevation or X
- azimuth or Y