[mythtv-users] Understanding HD Antennas ( was HDHomeRun and jumpy video)
beww at beww.org
Fri Sep 14 22:19:42 UTC 2007
Jon Boehm wrote:
> I'm having HD antenna problems myself right now. My signal strength is
> fine but I have unstable signal to noise ratio. :-( I have an
> HDHomerun, which I love, with a Antennas Direct DB4 in the attic.
> The antenna is directly attached to tuner0 of the hdhomerun with no
> Antennaweb said that I needed a Small Multi-direction Antenna. Since I
> was going to be mounting it in an attic I up sized to a Medium
> Multi-directional antenna. I wonder if my noise problems are due to the
> Muli-directional antenna? Any idea where I would go looking for the
> noise problem? I have one of those DC offset amplifiers. I'm going to
> give it a try this weekend.
If you have sufficient signal strength but unusable signal the problem
*might* be reflections, but it could be interfering signal(s), either
on-frequency or even off-frequency if the signal is of sufficient
strength to create mixer garbage in the HDHR.
Sometimes *reducing* the input level to the tuner (with an attenuator)
will actually make things better. You'd need a signal level meter or the
like to really know what's going on.
Does the signal look OK going directly into a TV set? (assuming you have
one capable of ATSC)? Do you have any neighbors getting good or bad ATSC
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