[opendtv] Re: DVB-T HDTV demo using 19.7 Mbps in a 6 Mhz channel in costa ri
- From: Doug McDonald <mcdonald@xxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 07 Mar 2006 08:36:36 -0600
Albert Manfredi wrote:
> Stephen W. Long wrote:
>
>> If you are going to all of the trouble to have a 30' antenna,
>> the selection of a 3db preamp to pull in a COFDM signal is no
>> big deal.
>
> It's not quiite that simple, right? The antenna amp might help compensate
> for signal losses in the downlead and connectors, but it won't create 3 dB
> of signal out of energy from a 115 VAC outlet.
The 3dB or 0.6 DB preamp is to amplify the signal without
adding noise. TV sets and STBs have crappy 6 dB or 8 dB
preamps. In the far field you need a better one. Cable
length does not matter much, since you need the good preamp
even if the cable length is five feet.
Doug McDonald
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