[mythtv] Problems tuning ATSC w/ HDHR and 0.21? LaGv Partial Lock?

[Derek Atkins]

Hi,

My cable provider decided that they no longer want to clear-QAM my
local HD stations so I decided to re-task one of my HDHR boxes with
an OTA antenna.  It mostly works (although I must admit that the
signal isn't as strong as the cable company's)...

The scanning process seemed to work okay, but when I walk through
the stations it cannot tune one of them.  When I try the OSD says:

  (Signal 100 % LaGv) Partial Lock

Looking at my backend log I see the following:

2008-05-29 22:52:31.136 Could not find channel 56_1 in TVCT
2008-05-29 22:52:31.137 
VCT Terra: channels(3) tsid(0x553) seclength(143)
Channel #0 name(WHDH-HD) 7-1 mod(ATSC 8-VSB) cTSID(0x553)
 pnum(3) ETM_loc(0) access_ctrl(0) hidden(0) hide_guide(1) service_type(2) source_id(1)
 descriptors length(17) count(1)
  Service Location Descriptor (0xa1) length(15)

Channel #1 name(WHDH-SD) 7-2 mod(ATSC 8-VSB) cTSID(0x553)
 pnum(4) ETM_loc(0) access_ctrl(0) hidden(0) hide_guide(1) service_type(2) source_id(2)
 descriptors length(17) count(1)
  Service Location Descriptor (0xa1) length(15)

Channel #2 name(WHDH TV) 7-0 mod(Analog) cTSID(0x552)
 pnum(65535) ETM_loc(0) access_ctrl(0) hidden(0) hide_guide(1) service_type(1) source_id(3)

Strangely WHDH is a different station (and it comes in just fine).

I saw a posting from a couple years ago that mentioned setting atscsrcid
but in my case atscsrcid (in the channel table) is NULL, so I'm
guessing that doesn't apply anymore.

I did capture the output of "mythtv-setup -v channel,siparser" when
scanning these stations, but mythtv-setup CRASHES at the end of the
scan process when run in this level of verbosity.  No, I haven't
grabbed a backtrace of the segv.  I suppose I can do that tomorrow,
but I really want to get this station tuning in right but I'm not
sure what tweaks to the database I might need to do.

All help would be greatly appreciate.

Again, this is 0.21 (current fixes branch as of a couple days ago).

Thanks in advance!

-derek
-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord at MIT.EDU                        PGP key available