[opendtv] Re: Analog v Digital TV

  • From: Barry Brown <barrysb@xxxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Mon, 15 Jan 2007 12:34:35 -0500

As I wrote, this is not my strongest channel feeding into the tuner. In fact it's about in the middle of the group.


On Jan 15, 2007, at 12:24 PM, John Willkie wrote:

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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