Which generation HD receiver do you have?

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

I have a 2003 Samsung HD TV with built-in HD tuner and it is LESS robust
(sensitive to signal issues) than a 2004 Samsung receiver I had an
opportunity to play with.

1)Overdrive (too much signal) will cause dropouts in the sound only in the
older tuner
2) Ghosts (multipath) will cause dropouts in pic and sound but the ghost has
to be much stronger in the newer set
3) The newer tuner is less affected by co-channel (skip of another signal on
the same freq).

It's really annoying as stations change their output for after dark and I
have problems, if the weather blows thru putting storm clouds between me and
the transmitter I have problems. Part of it is my fault as I have several
antennas mixed together. As long as the signal levels remain constant I
have stations from local and 60 miles away. If they change the ghosts
increase and I get dropouts.

Ch 3 is too strong as I have a antenna amp on the mast. But without the
antenna amp I loose two stations. Funny thing is that with the stations
that are further away I have NO problems (no ghosts are strong enough to
cause a problem).

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

"Jeff Rife" <wevsr@nabs.net> wrote in message
news:MPG.1b8af934a38a1a8d9897b1@news.nabs.net...
> Jeff Rigby (jeffg212@comcast.net) wrote in alt.tv.tech.hdtv:
> > 2) Ghosts (multipath) will cause dropouts in pic and sound but the ghost
has
> > to be much stronger in the newer set
>
> How do you know that multipath is the problem? Have you tested the signal
> with a spectrum analyzer?
>
No, I have a 20 db attenuator on the second antenna that I have to adj for
the dropouts to stop ( about 10 db ). When looking at the analog channels
you see the ghosts from the second antenna attenuate as I reduce the signal
from the second antenna. The newer set requires less attenuation than the
older set.

The problem seems to be aggravated with the stronger stations, which makes
sense since ghosts are more of a problem with stronger stations. I've
tried everything, the only thing that holds any hope is to filter out the
local channels received on ant 1 from ant 2 with trap filters. Looks like a
nice project.

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

"Jeff Rife" <wevsr@nabs.net> wrote in message
news:MPG.1b8c2b77f25663e79897b4@news.nabs.net...
> Jeff Rigby (jeffg212@comcast.net) wrote in alt.tv.tech.hdtv:
> > No, I have a 20 db attenuator on the second antenna that I have to adj
for
> > the dropouts to stop ( about 10 db ). When looking at the analog
channels
> > you see the ghosts from the second antenna attenuate as I reduce the
signal
> > from the second antenna. The newer set requires less attenuation than
the
> > older set.
>
> Unless the analog channels are the adjacent to the digital, I'd say that
> you still don't know anything.
>
> Even so, I have a channel 50 analog that is snowy and ghost-laden, but the
> channel 51 digital from the same tower (it's the same station) is pretty
> close to perfect. So, ghosts on analog don't tell you much about
multipath
> on digital.
>
Agreed, the point was that the NEWER set could display a HD picture when the
older set could not. And yes, several of the HD channels were adjacent in
freq to the analog channel. It's a classic test, the only other factor that
could be affecting the picture would be a distant station on the same freq,
which I checked. The only parameter I couldn't change was the time delay in
the ghost. So it matters WHICH receiver you have, a later model being
generally better at rejecting multipath and too strong a signal.

A different issue, WUSF ch 34 is broadcasting from Tampa but we have an
analog low power Christian station 3ABN (Three Angels Broadcast Network)
broadcasting here in Sarasota on the same channel 34. Of course that means
no Digital reception for WUSF here. 15 miles north of me my customers can
get WUSF digital.

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

"Jeff Rigby" <jeffg212@comcast.net> wrote in message
news:3KGdnSK8wLSwUb3cRVn-jA@comcast.com...
>I have a 2003 Samsung HD TV with built-in HD tuner and it is LESS robust
> (sensitive to signal issues) than a 2004 Samsung receiver I had an
> opportunity to play with.
>
> 1)Overdrive (too much signal) will cause dropouts in the sound only in the
> older tuner
> 2) Ghosts (multipath) will cause dropouts in pic and sound but the ghost
> has
> to be much stronger in the newer set
> 3) The newer tuner is less affected by co-channel (skip of another signal
> on
> the same freq).
>
> It's really annoying as stations change their output for after dark and I
> have problems, if the weather blows thru putting storm clouds between me
> and
> the transmitter I have problems. Part of it is my fault as I have several
> antennas mixed together. As long as the signal levels remain constant I
> have stations from local and 60 miles away. If they change the ghosts
> increase and I get dropouts.
>
> Ch 3 is too strong as I have a antenna amp on the mast. But without the
> antenna amp I loose two stations. Funny thing is that with the stations
> that are further away I have NO problems (no ghosts are strong enough to
> cause a problem).

If you are combining antennas you need to filter the bandwidth of the
individual antennas to the channel spectrum they are working at or you will
have multipath problems.