Ok, today I installed a default VIX 5.4.003 release.
Without any customisation I began a scan of our VAST Satellites (Optus D3/D10 these are co-sited), Optus D1 and Terrestrial.
When the DUO4K SE reached the end of the Optus D1 scan a crash log was attached with the interesting (and not surprising) notice that the symbol rate is "out of range" at 47,300 MYsMs !
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Optus D1
1451.8199> 04:17:26.0580 [eDVBChannel] OURSTATE: tuning
1451.8204> 04:17:26.0585 [eDVBFrontend1] set static current limiting
1451.8207> 04:17:26.0588 [eDVBFrontend1] invalidate current switch params
1451.8208> 04:17:26.0589 [eDVBFrontend1] set sequence pos 3
1451.8208> 04:17:26.0589 [eDVBFrontend1] set sequence pos 3
1451.8209> 04:17:26.0590 [eDVBFrontend1] update current switch params
1451.8209> 04:17:26.0590 [eDVBFrontend1] startTuneTimeout 5000
1451.8209> 04:17:26.0590 [eDVBFrontend1] setFrontend 1
1451.8209> 04:17:26.0590 [eDVBFrontend1] setting frontend
1451.8348> 04:17:26.0729 [eDVBFrontend1] fe event: status 0, inversion off, m_tuning 1
1451.8349> 04:17:26.0730 [eDVBFrontend1] sleep 500ms
1451.8898> 04:17:26.1279 [eDVBFrontend1] fe event: status 7, inversion off, m_tuning 2
1452.3351> 04:17:26.5732 [eDVBFrontend1] set dynamic current limiting
1456.8209> 04:17:31.0590 [eDVBChannel] OURSTATE: failed, fatal
1456.8210> 04:17:31.0591 [eDVBScan] no channels left: 0 scanned, 28 unavailable, 0 database.
1456.8247> 04:17:31.0628 [eDVBDB] Renumbering...
1456.8248> 04:17:31.0629 [eDVBDB] ---- saving lame channel db
1456.8321> 04:17:31.0702 [eDVBDB] saved 35 channels and 638 services!
1456.8468> 04:17:31.0849 [eComponentScan] scan done!
1456.8500> 04:17:31.0881 [eDVBFrontend8] opening frontend
1456.8502> 04:17:31.0883 [eDVBFrontend8] setVoltage FE_ENABLE_HIGH_LNB_VOLTAGE 0 FE_SET_VOLTAGE 2
1456.8523> 04:17:31.0904 [eDVBChannel] getDemux cap=00
1456.8523> 04:17:31.0904 [eDVBResourceManager] allocate demux cap=00
1456.8523> 04:17:31.0904 [eDVBResourceManager] allocating demux adapter=0, demux=0, source=1 fesource=8
1456.8523> 04:17:31.0904 [eDVBDemux] open demux /dev/dvb/adapter0/demux0
1456.8524> 04:17:31.0905 [eDVBFrontend8] tune
1456.8526> 04:17:31.0907 [eDVBFrontend8] tune setting type to 2 from 0
1456.8526> 04:17:31.0907 [eDVBChannel] OURSTATE: tuning
1456.8556> 04:17:31.0937 PC: b63e1354
1456.8556> 04:17:31.0937 Fault Address: 87a95f8b
1456.8556> 04:17:31.0937 Error Code:: 2566
1456.8559> 04:17:31.0940 Backtrace:
1456.8560> 04:17:31.0941 /usr/bin/enigma2(_Z17handleFatalSignaliP9siginfo_tPv) [0x81108]
1456.8561> 04:17:31.0942 /lib/libc.so.6(__default_rt_sa_restorer) [0xB61728F0]
1456.8561> 04:17:31.0942 -------FATAL SIGNAL (11)
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<4>[ 1351.768368] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
<4>[ 1356.769724] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
<4>[ 1361.770962] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
<4>[ 1366.787707] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
<4>[ 1371.775097] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
<4>[ 1376.775902] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
<4>[ 1381.901443] FE tune fe_handle=d5a74400
<4>[ 1384.126468] FE tune fe_handle=d5a74400
<4>[ 1386.343447] FE tune fe_handle=d5a74400
<4>[ 1388.580752] FE tune fe_handle=d5a74400
<4>[ 1390.806633] FE tune fe_handle=d5a74400
<4>[ 1391.779330] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
<4>[ 1396.780496] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
<4>[ 1401.782685] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
<4>[ 1406.783416] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
<4>[ 1411.784567] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
<4>[ 1416.785714] BRCM brcm_dvb0: DVB: adapter 0 frontend 0 symbol rate 47300000 out of range (1000000..45000000)
Optus D1
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What I cannot understand is that the Optus D1 bird has a number of lesser TP's which two other tuners' I have will lock and report a quality signal (not resolved to a video/ audio though), but locked nevertheless.
The DUO4K SE does not find a single service on the Optus D1 bird at all !

Other tuner !