[opendtv] Re: Analog v Digital TV
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 15 Jan 2007 09:24:14 -0800
The general problems with ATSC have to do with too much RF in high RF
environments. The general solution is to introduce attenuation. 21 db
sounds like a lot, but if it works .
I get stations flawlessly when 1'm about 15 miles from the tx site; crappily
when I'm 7 miles or less from the site
John Willkie
_____
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of Barry Brown
Sent: Monday, January 15, 2007 8:54 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Analog v Digital TV
On Jan 15, 2007, at 8:57 AM, Craig Birkmaier wrote:
Anything downstream in an ATSC transmission is error protection with the
sole purpose of trying to get the data in the files I described above to the
decoder in the receiver with the lowest number of errors possible. IF you
can receive the ATSC transmitted bits perfectly, you can reconstruct the
MPEG video stream at the same level of accuracy, as a decoder that is
connected to the output of the encoder ( i.e. NO CHANNEL ERRORS).
What ATSC signal conditions, other than multi-path errors, would cause some
receivers to give an intermittent "Loss of Signal" indication (might be loss
of sync) where inserting 21 dB of attenuation in the antenna connection
corrects the problem? One channel in my area is such a case. It is not the
strongest or weakest channel nor is there any indication of multi-path
errors on analog channels (not adjacent) either side of the problem child .
In fact one of the analogs is transmitted from the same tower as the DT
channel.
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