[opendtv] Re: How About Portable ATSC Receivers?
- From: Bob Miller <bob@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 30 Mar 2005 18:56:58 -0500
John Shutt wrote:
>Bert,
>
>You fail to mention HAAT for the Berlin towers, and until that is known, you
>can't know where the radio horizon is, nor how much more power is required
>to reach further. If the Berlin towers are at 150 feet HAAT, the radio
>horizon is only 17 miles away.
>
>Far field reception of COFDM was not a problem in the 1999 Sinclair tests,
>nor was it a problem in the flawed MSTV tests (successful reception up to 55
>miles away.) With identical ERP and HAAT, you would be hard pressed to
>notice a difference in reception between the two in the far field.
>
>
Actually there was a difference between the two in the far field. When
Sinclair went back with a "receiver" that had a decent front end and
tested seven sites in the far field where COFDM had failed it now worked
at all seven. 8-VSB had not worked at one of those seven sites. If you
go on single point data to a conclusion then COFDM was better in the far
field.
Bob Miller
>Stop reading numbers and start getting some real world experience.
>
>If I were to take Jay's brother's experience, it seems that the first and
>oldest Motorola box he had worked best. His two newer ones didn't work as
>well, so am I to assume from his experience that later generation ATSC boxes
>are worse than earlier ones? You can't generalize from a single anecdotal
>incident.
>
>John
>
>----- Original Message -----
>From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
>
>
>
>>The Berlin coverage contour for Channel 44 was 12 to
>>14 miles with indoor antenna, with a two-tower 170 KW
>>ERP per tower SFN, using 16-QAM and 2/3 FEC
>>(2.1 b/s/Hz).
>>
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