[opendtv] Re: How About Portable ATSC Receivers?

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).
>>

 
 
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:

- Using the UNSUBSCRIBE command in your user configuration settings at 
FreeLists.org 

- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word 
unsubscribe in the subject line.

Other related posts: