[opendtv] Re: DTV Channel Assignments
- From: "John Golitsis" <john@xxxxxxxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 22 Jun 2005 21:57:00 -0400
Curious on the wording of that. What does "...related to a margin signal
condition caused by multi-path reception" mean, exactly?
----- Original Message -----
From: "John Willkie" <JohnWillkie@xxxxxxxxxxxxx>
> Dale;
>
> I thought the power level/multipath problem was related to receivers not
> being able to handle multipath in strong RF environments. I haven't heard
> of people complaining about multipath is far-field situations. Also, we
> don't seem to have much multipath issues in San Diego/Tijuana; I presume
> because the transmitters aren't near tall buildings. (There are multipath
> issues near these tall buildings, but that's nothing new to the region.)
>
> John Willkie
>
>
> ----- Original Message -----
> From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
> To: <opendtv@xxxxxxxxxxxxx>
> Sent: Wednesday, June 22, 2005 5:03 PM
> Subject: [opendtv] Re: DTV Channel Assignments
>
>
>> Doug wrote:
>> >What is the worst problem with 8-VSB? Yes it is multi path.
>> >
>> > NO NO NO ... you seem to have some misapprehension here. The screaming
>> > of a very tiny number of people is "multipath" but in the REAL world,
>> > it is power level.
>>
>> The Sencor SLM1456 Signal Level Analyzer manual says;
>>
>> Minimizing Multi-Path Reception Using the Integrated Spectrum
> Analyzer
>>
>> A large majority of HDTV off-air reception "drop outs" is related
>> to
> a
>> margin signal condition caused by multi-path reception. Multi-path
> reception
>> describes signals taking different paths between the transmitter and the
>> receive antenna. The result is the same digital signal traveling slightly
>> longer or shorter distances and arriving at the antenna and therefore the
>> receiver's decoder at slightly different times.
>>
>>
>>
>>
>>
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