[mythtv-commits] Ticket #9777: Channel scanner stores centre freq instead of offset for DVB-T
MythTV
noreply at mythtv.org
Thu Aug 11 23:12:29 UTC 2011
#9777: Channel scanner stores centre freq instead of offset for DVB-T
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Reporter: david_a <baroque@…> | Owner: danielk
Type: Bug Report - General | Status: new
Priority: minor | Milestone: unknown
Component: MythTV - Channel Scanner | Version: 0.24-fixes
Severity: medium | Resolution:
Keywords: offset frequency | Ticket locked: 0
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Comment (by david_a <baroque@…>):
Yes any additional info on a workaround (esp. if it may be quicker than
manually adjusting and re-scanning the relevant transports) would be worth
recording in the wiki.
Another comment worth noting in this discussion (given this particular
detail may not be obvious unless a person has RF receiver experience) is
that broadcast tuners use their own automatic fine tuning to lock onto a
signal once they've been commanded to a frequency which is 'close enough'
to the real one. The design of the tuner determines how close is close
enough, and is the reason why some tuners don't care if the commanded
frequency might be 125kHz away from the real transmitter frequency, but
others do. It also follows from this that the value stored in the
dtv_multiplex table does not have to match exactly the transmitter
frequency, but needs to be close enough that all models of tuner will
lock.
But ultimately the reason for documenting this bug was to provide enough
detail to allow the code to be modified so that, in any country such as
Australia which employs DVB-T offsets, the scan would provide a working
result automatically without requiring the user to resort to external
utilities or manual adjustments.
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Ticket URL: <http://code.mythtv.org/trac/ticket/9777#comment:5>
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