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Mitsubishi WS73903 OTA HDTV Reception w/HD-1080

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Anonymous
August 24, 2004 11:42:46 PM

Archived from groups: alt.tv.tech.hdtv (More info?)

Hi - I have a Mitsubishi WS-73903 TV (first generation) and the HD-1080
receiver. I'm trying to pick up local HDTV stations by antenna, using a
ChannelMaster 4248 antenna, which is supposed to be one of the better ones
for HDTV reception.

The antenna is pointed towards the major stations in my area (they're about
14 miles away).

I am able to get a picture, with a HDTV signal registering on the channel
info. It only looks like HDTV in the center of the picture though - there's
severe color non-convergence away from the center. Some pixelation / still
frame on the KERA PBS channel (I'm in Arlington, between Dallas & Ft.
Worth - majority of local stations are broadcasting out of Dallas).

Using channel info, I'm showing essentially no signal strength from the
antenna.
I can receive DTV channels with no problem, distortion or color divergences.

The picture is converged fine on any other input. I'm trying to figure out
whether I'm not getting enough signal from the antenna, or whether the
HD1080 receiver has a problem with it. Of course, the person I bought the
antenna from feels it's a receiver problem! (go figure)

Any ideas which of the 2 directions I should pursue as being the culprit?

Thanks!


glinskym@sbcglobal.net
Anonymous
August 24, 2004 11:42:47 PM

Archived from groups: alt.tv.tech.hdtv (More info?)

MarkSG wrote:
>
> Hi - I have a Mitsubishi WS-73903 TV (first generation) and the HD-1080
> receiver. I'm trying to pick up local HDTV stations by antenna, using a
> ChannelMaster 4248 antenna, which is supposed to be one of the better ones
> for HDTV reception.
>
> The antenna is pointed towards the major stations in my area (they're about
> 14 miles away).
>
> I am able to get a picture, with a HDTV signal registering on the channel
> info. It only looks like HDTV in the center of the picture though - there's
> severe color non-convergence away from the center. Some pixelation / still
> frame on the KERA PBS channel (I'm in Arlington, between Dallas & Ft.
> Worth - majority of local stations are broadcasting out of Dallas).
>
> Using channel info, I'm showing essentially no signal strength from the
> antenna.
> I can receive DTV channels with no problem, distortion or color divergences.
>
> The picture is converged fine on any other input. I'm trying to figure out
> whether I'm not getting enough signal from the antenna, or whether the
> HD1080 receiver has a problem with it. Of course, the person I bought the
> antenna from feels it's a receiver problem! (go figure)
>
> Any ideas which of the 2 directions I should pursue as being the culprit?
>
> Thanks!
>
> glinskym@sbcglobal.net


MarK:

You have a very good CM UHF antenna....

Is the Problem the STBox or Antenna...?????

Here is 1 way to check out the antenna ONLY ...

I've run this UHF test on my CM 3021 & Sony TV set recently...

Screw the UHF antenna into the Analog RF TV port...
Skip using the STBox for this test....

The UHF antenna on Analog channels only via RF TV antenna port
should give:

Lots of Snow for Analog Chan 2 thru 4 VHF

Some Grain for Analog Chans 5 & 6 VHF

Near perfect Picture for Analog Chans 7 thru 13 VHF

Perfect Picture for Analog Chans 14 thru 59 UHF

Each of the 4 Groups is a Different Freq Band....

If the Test results are as noted above...
Then the Set Top box may be a problem
or the RG-6 Antenna Cable connections..

My UHF Analog OTA test was for Towers 8 to 11 miles away..
on the Same hill..
Anonymous
August 24, 2004 11:42:47 PM

Archived from groups: alt.tv.tech.hdtv (More info?)

"MarkSG" <glinskym@sbcglobal.net> wrote in message
news:WSMWc.5479$vy.4433@newssvr24.news.prodigy.com...
> Hi - I have a Mitsubishi WS-73903 TV (first generation) and the HD-1080
> receiver. I'm trying to pick up local HDTV stations by antenna, using a
> ChannelMaster 4248 antenna, which is supposed to be one of the better ones
> for HDTV reception.
>
> The antenna is pointed towards the major stations in my area (they're
about
> 14 miles away).
>
> I am able to get a picture, with a HDTV signal registering on the channel
> info. It only looks like HDTV in the center of the picture though -
there's
> severe color non-convergence away from the center. Some pixelation /
still
> frame on the KERA PBS channel (I'm in Arlington, between Dallas & Ft.
> Worth - majority of local stations are broadcasting out of Dallas).
>
> Using channel info, I'm showing essentially no signal strength from the
> antenna.
> I can receive DTV channels with no problem, distortion or color
divergences.
>
> The picture is converged fine on any other input. I'm trying to figure
out
> whether I'm not getting enough signal from the antenna, or whether the
> HD1080 receiver has a problem with it. Of course, the person I bought the
> antenna from feels it's a receiver problem! (go figure)
>
> Any ideas which of the 2 directions I should pursue as being the culprit?

Sounds like your set needs convergence adjusted in the 1080i mode. Has the
set ever been serviced?

Leonard
Related resources
Anonymous
August 25, 2004 1:17:29 PM

Archived from groups: alt.tv.tech.hdtv (More info?)

"MarkSG" <glinskym@sbcglobal.net> wrote in message
news:WSMWc.5479$vy.4433@newssvr24.news.prodigy.com...
> Hi - I have a Mitsubishi WS-73903 TV (first generation) and the HD-1080
> receiver. I'm trying to pick up local HDTV stations by antenna, using a
> ChannelMaster 4248 antenna, which is supposed to be one of the better ones
> for HDTV reception.
>
> The antenna is pointed towards the major stations in my area (they're
about
> 14 miles away).
>
> I am able to get a picture, with a HDTV signal registering on the channel
> info. It only looks like HDTV in the center of the picture though -
there's
> severe color non-convergence away from the center. Some pixelation /
still
> frame on the KERA PBS channel (I'm in Arlington, between Dallas & Ft.
> Worth - majority of local stations are broadcasting out of Dallas).
>
> Using channel info, I'm showing essentially no signal strength from the
> antenna.
> I can receive DTV channels with no problem, distortion or color
divergences.
>
> The picture is converged fine on any other input. I'm trying to figure
out
> whether I'm not getting enough signal from the antenna, or whether the
> HD1080 receiver has a problem with it. Of course, the person I bought the
> antenna from feels it's a receiver problem! (go figure)
>
> Any ideas which of the 2 directions I should pursue as being the culprit?
>
Older projection TV's had two or more resolutions modes where convergance
and all adj were unique to that mode. In other words convergance has to be
done in both NTSC (480i) and HD mode (1080i). Sounds like your convergance
needs to be adjusted for HD mode. Newer sets display at ONE resolution and
convert in a module to the other modes.
Anonymous
August 25, 2004 5:14:58 PM

Archived from groups: alt.tv.tech.hdtv (More info?)

"Jeff Rigby" <jeffg212@comcast.net> wrote in message
news:YPednSwzDupfDLHcRVn-ow@comcast.com...
>
> "MarkSG" <glinskym@sbcglobal.net> wrote in message
> news:WSMWc.5479$vy.4433@newssvr24.news.prodigy.com...
> > Hi - I have a Mitsubishi WS-73903 TV (first generation) and the HD-1080
> > receiver. I'm trying to pick up local HDTV stations by antenna, using a
> > ChannelMaster 4248 antenna, which is supposed to be one of the better
ones
> > for HDTV reception.
> >
> > The antenna is pointed towards the major stations in my area (they're
> about
> > 14 miles away).
> >
> > I am able to get a picture, with a HDTV signal registering on the
channel
> > info. It only looks like HDTV in the center of the picture though -
> there's
> > severe color non-convergence away from the center. Some pixelation /
> still
> > frame on the KERA PBS channel (I'm in Arlington, between Dallas & Ft.
> > Worth - majority of local stations are broadcasting out of Dallas).
> >
> > Using channel info, I'm showing essentially no signal strength from the
> > antenna.
> > I can receive DTV channels with no problem, distortion or color
> divergences.
> >
> > The picture is converged fine on any other input. I'm trying to figure
> out
> > whether I'm not getting enough signal from the antenna, or whether the
> > HD1080 receiver has a problem with it. Of course, the person I bought
the
> > antenna from feels it's a receiver problem! (go figure)
> >
> > Any ideas which of the 2 directions I should pursue as being the
culprit?
> >
> Older projection TV's had two or more resolutions modes where convergance
> and all adj were unique to that mode. In other words convergance has to
be
> done in both NTSC (480i) and HD mode (1080i). Sounds like your
convergance
> needs to be adjusted for HD mode. Newer sets display at ONE resolution
and
> convert in a module to the other modes.

Which sets would those be? I thought all of the Mits CRT based sets were
currently displaying 480i as 960i and 720p as 1080i. They still require
different alignments for the two scan frequencies, even though the 480 is
line doubled.

Leonard
Anonymous
August 25, 2004 9:40:46 PM

Archived from groups: alt.tv.tech.hdtv (More info?)

"Leonard G. Caillouet" <lcaillo_ns_@devoynet.com> wrote in message
news:IFOWc.14204$0o5.11320@bignews1.bellsouth.net...
> Sounds like your set needs convergence adjusted in the 1080i mode. Has
the set ever been serviced?

The set hasn't been serviced since I moved it here from Houston, but I have
converged it myself, only for regular NTSC however. I wasn't sure if the
convergence would be different for HDTV mode than regular NTSC, and I was
reluctant to change all the convergence for HDTV if it would change the
settings for NTSC (I don't think there's separate memories for
convergences).

Guess I'll try converging it and see what I get, and see if it retains the
values when switched back to NTSC 480. Was a bit thrown by the DTV pictures
looking very good (including the weather radar channels) and the lack of
signal strength shown on the Info screen.

Thanks!
Anonymous
August 25, 2004 10:32:41 PM

Archived from groups: alt.tv.tech.hdtv (More info?)

"MarkSG" <glinskym@sbcglobal.net> wrote in message
news:ya4Xc.6108$FD6.3016@newssvr24.news.prodigy.com...
>
> "Leonard G. Caillouet" <lcaillo_ns_@devoynet.com> wrote in message
> news:IFOWc.14204$0o5.11320@bignews1.bellsouth.net...
> > Sounds like your set needs convergence adjusted in the 1080i mode. Has
> the set ever been serviced?
>
> The set hasn't been serviced since I moved it here from Houston, but I
have
> converged it myself, only for regular NTSC however. I wasn't sure if the
> convergence would be different for HDTV mode than regular NTSC, and I was
> reluctant to change all the convergence for HDTV if it would change the
> settings for NTSC (I don't think there's separate memories for
> convergences).
>
> Guess I'll try converging it and see what I get, and see if it retains the
> values when switched back to NTSC 480. Was a bit thrown by the DTV
pictures
> looking very good (including the weather radar channels) and the lack of
> signal strength shown on the Info screen.
>
> Thanks!

Yes, there ARE separate convergence memories for the two scan rates. If,
however, the HD convergence is out by more than the width of a line in your
advanced convergence pattern, it needs to be converged at the service level.
Trying to do too much in the consumer menu may result in some linearity
problems and some strange effects.

Leonard
Anonymous
August 26, 2004 7:49:35 PM

Archived from groups: alt.tv.tech.hdtv (More info?)

"Leonard G. Caillouet" <lcaillo_ns_@devoynet.com> wrote in message
news:wt8Xc.25469$0o5.19326@bignews1.bellsouth.net...
> Yes, there ARE separate convergence memories for the two scan rates. If,
> however, the HD convergence is out by more than the width of a line in
your
> advanced convergence pattern, it needs to be converged at the service
level.
> Trying to do too much in the consumer menu may result in some linearity
> problems and some strange effects.

I reconverged for the HD input, and that helps quite a bit. It does retain
the separate
settings for HD and for all other modes - it may memorize separately for 480
and 1080,
or possibly for each separate input, might have to try that.

The convergence is quite far off on the edges, and I am getting some
non-linearity
as you mention. Particularly noticeable when you watch something like track
& field
on the Olympics and can see the lane markers bend at the edge of the
picture!

I still think I'm not getting enough signal from the antenna though, as I
register no
signal strength on the meter, and I'm not getting all of the local stations
on that
compass point that I should be, so I think the next step I'll try is to add
a signal
amplifier on the antenna output.

Thanks for the help!

Mark
Anonymous
August 26, 2004 7:49:36 PM

Archived from groups: alt.tv.tech.hdtv (More info?)

"MarkSG" <glinskym@sbcglobal.net> wrote in message
news:jEnXc.6407$j94.3138@newssvr24.news.prodigy.com...
>
> "Leonard G. Caillouet" <lcaillo_ns_@devoynet.com> wrote in message
> news:wt8Xc.25469$0o5.19326@bignews1.bellsouth.net...
> > Yes, there ARE separate convergence memories for the two scan rates.
If,
> > however, the HD convergence is out by more than the width of a line in
> your
> > advanced convergence pattern, it needs to be converged at the service
> level.
> > Trying to do too much in the consumer menu may result in some linearity
> > problems and some strange effects.
>
> I reconverged for the HD input, and that helps quite a bit. It does
retain
> the separate
> settings for HD and for all other modes - it may memorize separately for
480
> and 1080,
> or possibly for each separate input, might have to try that.
>
> The convergence is quite far off on the edges, and I am getting some
> non-linearity
> as you mention. Particularly noticeable when you watch something like
track
> & field
> on the Olympics and can see the lane markers bend at the edge of the
> picture!
>
> I still think I'm not getting enough signal from the antenna though, as I
> register no
> signal strength on the meter, and I'm not getting all of the local
stations
> on that
> compass point that I should be, so I think the next step I'll try is to
add
> a signal
> amplifier on the antenna output.
>
> Thanks for the help!
>
> Mark

Signal quality is a completely different issue from convergence and has no
affect on it. Sounds like you need the convergence checked out by someone
with experience repairing the Mits.

Leonard
Anonymous
August 28, 2004 1:36:47 AM

Archived from groups: alt.tv.tech.hdtv (More info?)

"Leonard G. Caillouet" <lcaillo_ns_@devoynet.com> wrote in message
news:qSoXc.33308$%n4.28411@bignews6.bellsouth.net...
> Signal quality is a completely different issue from convergence and has no
affect on it. Sounds like you need the convergence checked out by someone
> with experience repairing the Mits.


The convergence is to a point where it's useable. But I still should be
getting more stations and better signal strength, and that's tied up with
the antenna.

MSG
Related resources
!