STV0297 Tuning Issues

"Michael Ditum" <mike@xxxxxxxxxxxxxxx> · Thu, 29 Mar 2007 09:31:33 +0100

Hi,

I'm currently doing some tuning testing with the STV0297 DVB-C Card. I have a DVB-S to DVB-C TransModulator which I am using and just modifying the output settings.

I'm having some issues tuning in a couple of the test cases and was wondering if there was any technical reason why this was not possible. The tests I am having trouble tuning in are...

Symbol Rate of 1.74MBd with QAM 32, 64 & 128 (works fine with QAM 16 and 256)
Symbol Rate of 3.48MBd with QAM 32 (works fine with all other QAM's)I am testing the tuning with dvbtune and as long as the xml version of the SDT is returned I am counting that as working.

Does anyone know why I cannot tune with these settings? Is it a problem with the driver?

I've provided my test results below;

Thanks for any help

Mike

			Frequency (MHz)

			Bitrate (MB/s)

			Symbol Rate (MBd)

			Modulation (QAM)

			Tuning Tested
			Tuning Works
			Notes

			62
			25.4
			6.89
			16
			Yes
			Yes

			220
			25.4
			6.89
			16
			Yes
			Yes

			440
			25.4
			6.89
			16
			Yes
			Yes

			62
			25.21
			6.84
			16
			Yes
			Yes

			220
			25.21
			6.84
			16
			Yes
			Yes

			440
			25.21
			6.84
			16
			Yes
			Yes

			62
			12.83
			3.48
			16
			Yes
			Yes

			220
			12.83
			3.48
			16
			Yes
			Yes

			440
			12.83
			3.48
			16
			Yes
			Yes

			62
			6.41
			1.74
			16
			Yes
			Yes

			220
			6.41
			1.74
			16
			Yes
			Yes

			440
			6.41
			1.74
			16
			Yes
			Yes

			62
			31.75
			6.89
			32
			Yes
			Yes

			220
			31.75
			6.89
			32
			Yes
			Yes

			440
			31.75
			6.89
			32
			Yes
			Yes

			62
			31.52
			6.84
			32
			Yes
			Yes

			220
			31.52
			6.84
			32
			Yes
			Yes

			440
			31.52
			6.84
			32
			Yes
			Yes

			62
			16.04
			3.48
			32
			Yes
			No
			Couldn't Lock

			220
			16.04
			3.48
			32
			Yes
			No
			Couldn't Lock

			440
			16.04
			3.48
			32
			Yes
			No
			Couldn't Lock

			62
			8.02
			1.74
			32
			Yes
			No
			Couldn't Lock

			220
			8.02
			1.74
			32
			Yes
			No
			Couldn't Lock

			440
			8.02
			1.74
			32
			Yes
			No
			Couldn't Lock

			62
			38.1
			6.89
			64
			Yes
			Yes

			220
			38.1
			6.89
			64
			Yes
			Yes

			440
			38.1
			6.89
			64
			Yes
			Yes

			62
			37.82
			6.84
			64
			Yes
			Yes

			220
			37.82
			6.84
			64
			Yes
			Yes

			440
			37.82
			6.84
			64
			Yes
			Yes

			62
			19.24
			3.48
			64
			Yes
			Yes

			220
			19.24
			3.48
			64
			Yes
			Yes

			440
			19.24
			3.48
			64
			Yes
			Yes

			62
			9.62
			1.74
			64
			Yes
			No
			Couldn't Lock

			220
			9.62
			1.74
			64
			Yes
			No
			Couldn't Lock

			440
			9.62
			1.74
			64
			Yes
			No
			Couldn't Lock

			62
			44.45
			6.89
			128
			Yes
			Yes

			220
			44.45
			6.89
			128
			Yes
			Yes

			440
			44.45
			6.89
			128
			Yes
			Yes

			62
			44.12
			6.84
			128
			Yes
			Yes

			220
			44.12
			6.84
			128
			Yes
			Yes

			440
			44.12
			6.84
			128
			Yes
			Yes

			62
			22.45
			3.48
			128
			Yes
			Yes

			220
			22.45
			3.48
			128
			Yes
			Yes

			440
			22.45
			3.48
			128
			Yes
			Yes

			62
			11.22
			1.74
			128
			Yes
			No
			Couldn't Lock

			220
			11.22
			1.74
			128
			Yes
			No
			Couldn't Lock

			440
			11.22
			1.74
			128
			Yes
			No
			Couldn't Lock

			62
			50.8
			6.89
			256
			Yes
			Yes

			220
			50.8
			6.89
			256
			Yes
			Yes

			440
			50.8
			6.89
			256
			Yes
			Yes

			62
			50.43
			6.84
			256
			Yes
			Yes

			220
			50.43
			6.84
			256
			Yes
			Yes

			440
			50.43
			6.84
			256
			Yes
			Yes

			62
			25.66
			3.48
			256
			Yes
			Yes

			220
			25.66
			3.48
			256
			Yes
			Yes

			440
			25.66
			3.48
			256
			Yes
			Yes

			62
			12.83
			1.74
			256
			Yes
			Yes

			220
			12.83
			1.74
			256
			Yes
			Yes

			440
			12.83
			1.74
			256
			Yes
			Yes

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Frequency (MHz)	Bitrate (MB/s)	Symbol Rate (MBd)	Modulation (QAM)	Tuning Tested	Tuning Works	Notes
62	25.4	6.89	16	Yes	Yes
220	25.4	6.89	16	Yes	Yes
440	25.4	6.89	16	Yes	Yes
62	25.21	6.84	16	Yes	Yes
220	25.21	6.84	16	Yes	Yes
440	25.21	6.84	16	Yes	Yes
62	12.83	3.48	16	Yes	Yes
220	12.83	3.48	16	Yes	Yes
440	12.83	3.48	16	Yes	Yes
62	6.41	1.74	16	Yes	Yes
220	6.41	1.74	16	Yes	Yes
440	6.41	1.74	16	Yes	Yes
62	31.75	6.89	32	Yes	Yes
220	31.75	6.89	32	Yes	Yes
440	31.75	6.89	32	Yes	Yes
62	31.52	6.84	32	Yes	Yes
220	31.52	6.84	32	Yes	Yes
440	31.52	6.84	32	Yes	Yes
62	16.04	3.48	32	Yes	No	Couldn't Lock
220	16.04	3.48	32	Yes	No	Couldn't Lock
440	16.04	3.48	32	Yes	No	Couldn't Lock
62	8.02	1.74	32	Yes	No	Couldn't Lock
220	8.02	1.74	32	Yes	No	Couldn't Lock
440	8.02	1.74	32	Yes	No	Couldn't Lock
62	38.1	6.89	64	Yes	Yes
220	38.1	6.89	64	Yes	Yes
440	38.1	6.89	64	Yes	Yes
62	37.82	6.84	64	Yes	Yes
220	37.82	6.84	64	Yes	Yes
440	37.82	6.84	64	Yes	Yes
62	19.24	3.48	64	Yes	Yes
220	19.24	3.48	64	Yes	Yes
440	19.24	3.48	64	Yes	Yes
62	9.62	1.74	64	Yes	No	Couldn't Lock
220	9.62	1.74	64	Yes	No	Couldn't Lock
440	9.62	1.74	64	Yes	No	Couldn't Lock
62	44.45	6.89	128	Yes	Yes
220	44.45	6.89	128	Yes	Yes
440	44.45	6.89	128	Yes	Yes
62	44.12	6.84	128	Yes	Yes
220	44.12	6.84	128	Yes	Yes
440	44.12	6.84	128	Yes	Yes
62	22.45	3.48	128	Yes	Yes
220	22.45	3.48	128	Yes	Yes
440	22.45	3.48	128	Yes	Yes
62	11.22	1.74	128	Yes	No	Couldn't Lock
220	11.22	1.74	128	Yes	No	Couldn't Lock
440	11.22	1.74	128	Yes	No	Couldn't Lock
62	50.8	6.89	256	Yes	Yes
220	50.8	6.89	256	Yes	Yes
440	50.8	6.89	256	Yes	Yes
62	50.43	6.84	256	Yes	Yes
220	50.43	6.84	256	Yes	Yes
440	50.43	6.84	256	Yes	Yes
62	25.66	3.48	256	Yes	Yes
220	25.66	3.48	256	Yes	Yes
440	25.66	3.48	256	Yes	Yes
62	12.83	1.74	256	Yes	Yes
220	12.83	1.74	256	Yes	Yes
440	12.83	1.74	256	Yes	Yes