Archived from groups: alt.video.satellite.4dtv (
More info?)
My bad, I was thinking of the multiple transponder spot beams of the dbs
system. It is two bounces. I think one of the uplinks is Fortcollins Co.. I
said it once and I will say it again. My Bad.
Jack
"Valdivar" <rebelleader68@hotmail.com> wrote in message
news:brzHd.48647$W33.1115435@news20.bellglobal.com...
> The reason they can use an 18" dish is because it is ku band...or more to
> the point because of the relationship between wavelength and frequency.
>
> As freq. goes up,the wave length gets shorter,so the size of the antenna
> (dipole) gets shorter,so for an antenna for channel 6 vhf it is a
> monster,but for ch.57 UHF it's quite small.
>
> In the case of satellite tv,the dish has to be 1 wavelength I think.Enough
> to catch the signal anyway'
>
> For ku band,because it's a higher freq. and in the case of direct tv,etc
> because the satellites are quite powerful,one can use an 18"
> dish,whereas,for analog and mpeg-2 fta ku band,generally at least a 30"
> dish is needed!
> "Gary J. Tait" <classicsat@yahoo.com> wrote in message
> news:04usu053vrbjoi0l66j86u3e96atorqdd9@4ax.com...
>> >"jack96620" <jack96620@hotmail.com> wrote in message
>>>news:j%9Hd.1799$ry.1056@fed1read05...
>>>> The way I understand it Dish, Direct. Voom all send their signals three
>>>> bounces instead of one bounce we're use to. Bounce one goes
>>>> Broadcaster
>>>> to satellite back down to earth were we pick it up and they do to.
>>>> Bounce
>>>> two goes from small dish co. to satellite. Bounce three goes from
>>>> satellite to their higher power satellites to ground. Making the signal
>>>> third generation. Not to mention a lot of processing and rebroadcasts.
>>>> Just so they can use the 18" dish. The more processing, rebroadcasts,
>>>> the
>>>> better the chance for the signal degrading. To me small dish TV is the
>>>> difference between watching a copy of a VHS tape, and DVD. Their the
>>>> poor
>>>> quality tape and we're the pristine DVD.
>>>>
>>>> Jack
>>
>>
>> Satellite doesn't work that way. There is no compression losses in a
>> satellite hop. For all intents and purposes, it is an analog pat,
>> whatever comes up comes down, so for an average cable channel, their
>> channel is uplinked on C-band, the DBS company would recive it (and
>> probably transcode the received MPEG2, rather than a full analog
>> re-conversion, and transmit that. And there are no satellite>satellite
>> communications for geostationary TV satellites.
>>
>
>