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Opened 8 years ago

Closed 8 years ago

Last modified 8 years ago

#610 closed patch (fixed)

Add a seperate frequency list for US-Cable-IRC

Reported by: anonymous Owned by: ijr
Priority: minor Milestone: unknown
Component: mythtv Version:
Severity: low Keywords:
Cc: Ticket locked: no

Description

The IRC frequency standard used by many cable systems differs substantially in the frequencies for channels 5 & 6 (US-Cable values are 2125 KHz low) and subtilely for the rest (default values are (US-Cable values are 125 Khz low). For some users this is enough to cause flakey/missing audio on certain channels. While this can be corrected via finetuning, the offsets for channels 5 & 6 are high enough to be completely off.

Attachments (1)

mythtv-irc.patch (4.4 KB) - added by sphery <mtdean@…> 8 years ago.

Download all attachments as: .zip

Change History (5)

comment:1 Changed 8 years ago by danielk

  • Resolution set to invalid
  • Status changed from new to closed

invalid, feature request w/o patch

comment:2 Changed 8 years ago by sphery <mtdean@…>

  • Resolution invalid deleted
  • Severity changed from medium to low
  • Status changed from closed to reopened
  • Type changed from enhancement to patch

Updated version of jrandall's 0.18.1 patch ( http://www.gossamer-threads.com/lists/mythtv/dev/147943#147943 ). The 0.18.1 patch applied cleanly to SVN (with offsets), but I moved the us-cable-irc to come after us-cable-hrc (so the us-cable frequency tables are sorted alphabetically).

I can't test this patch because a) I'm 1000 miles from my Myth box, and b) I don't have any RF modulated sources (let alone an IRC source). However I can at least say it compiles and that the frequencies should be close enough to correct for the tuner's fine-tuning algorithm to find them (technically, all channels should be 0.0125MHz higher than given).

Changed 8 years ago by sphery <mtdean@…>

comment:3 Changed 8 years ago by danielk

  • Resolution set to fixed
  • Status changed from reopened to closed

(In [7835]) Closes #610, by applying patch.

This adds another frequency allocation used by US cable
providers to avoid interference from OTA broadcasters.

comment:4 Changed 8 years ago by anonymous

The frequencies in the patch are all still low by 125 Khz. This is so trivial to fix that it's silly not to. c.f. - http://www.jneuhaus.com/fccindex/cablech.html

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