Opened 13 years ago
Closed 4 years ago
#11482 closed Developer Task (Trac EOL)
Implement support for LNAs through DVB API
| Reported by: | stuartm | Owned by: | Klaas de Waal |
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| Priority: | minor | Milestone: | 32.0 |
| Component: | MythTV - DVB | Version: | Master Head |
| Severity: | low | Keywords: | |
| Cc: | Stuart Auchterlonie | Ticket locked: | no |
Description (last modified by )
Since a lot of users have problems with drivers that default to disabling the LNA built into their tuners we should implement support for enabling the LNA when using the card with MythTV.
My experience of handling user support requests in IRC and mailing lists suggests that most users need the LNA enabled, so the simplest solution would just enable by default with a GUI option to disable it.
A better implementation would automatically the LNA if the signal strength/quality falls below a reasonable threshold. The difficulty here is that signal strength can change over time and with changes in weather, so the very best implementation would be tied to the signal monitor and work per-tune rather than be set once when scanning.
Attachments (1)
Change History (15)
comment:1 by , 13 years ago
| Owner: | set to |
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| Status: | new → assigned |
comment:2 by , 12 years ago
| Milestone: | 0.27 → 0.28 |
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comment:3 by , 12 years ago
| Priority: | minor → blocker |
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comment:4 by , 11 years ago
| Component: | MythTV - General → MythTV - DVB |
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comment:5 by , 10 years ago
| Milestone: | 0.28 → 0.29 |
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comment:6 by , 10 years ago
| Milestone: | 0.29 → 29.0 |
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comment:8 by , 8 years ago
| Milestone: | 29.0 → 29.1 |
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comment:9 by , 8 years ago
| Milestone: | 29.1 → 0.28.2 |
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Moving remaining open tickets to 0.28.2 milestone
comment:10 by , 8 years ago
| Milestone: | 0.28.2 → 29.2 |
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Moving remaining open tickets to 29.2 milestone
comment:11 by , 6 years ago
| Cc: | added |
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| Status: | assigned → infoneeded |
This is something that looks not too difficult to implement, although it needs a database schema update to store the LNA setting.
I have done comparative testing with "LNA off" and "LNA on" with two different DVB-T2 tuners, a MyGica T230 USB stick and a Digital Devices PCIe card. On both tuners there is no difference whatsoever between "LNA off" and "LNA on" as shown in the Signal/Noise and Signal Strength values in the mythtv-setup SCANNING page.
The question is whether implementing this will make a difference for anybody. If there are tuners who are documented to have an LNA then please add them to this ticket. For those willing to test their DVB-T2 tuner, the patch that I used to test this, 20191217-lna-on-off.patch is attached.
by , 6 years ago
| Attachment: | 20191217-lna-on-off.patch added |
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Switch LNA on, off or auto (requires recompliing to change setting)
comment:12 by , 6 years ago
| Milestone: | 29.2 → 32.0 |
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| Owner: | changed from to |
| Priority: | blocker → minor |
| Severity: | medium → low |
| Status: | infoneeded → assigned |
As this is documented in the DVBv5 and potentially useful it is a good idea to implement this for v32.
comment:13 by , 5 years ago
| Description: | modified (diff) |
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comment:14 by , 4 years ago
| Resolution: | → Trac EOL |
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| Status: | assigned → closed |
We have moved all bug tracking to github [1]
If you continue to have this issue, please open a new issue at github, referencing this ticket.
Milestone renamed