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Subject: Re: Astar 2a & 2b (North & South)


Author:
Bobben
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Date Posted: 13:48:39 11/27/03 Thu
In reply to: Brian 's message, "Re: Astar 2a & 2b (North & South)" on 00:20:00 11/27/03 Thu
 >There are some good info points here Bobben.
>
>In your opinion could these crosspol isolations cause
>problems in receiving 2D ( ie could a larger dish be
>confused with so many north´s and south´s ? ).

No - because 2D has only one beam. Still it is of course important to have at least 20dB of crosspol isolation.

In the receiver there is a amplifier that amplifies the whole band from 950-2150MHz. In that band there will be powerful Eurobird and Astra 2A/2B transponders that in theory can saturate the amplifier and cause intermodulation which interfer with the low power Astra 2D transponders.

It would have been interessting to test as 950-1250MHz band filter or a 1250MHz low pass filter but I dont believe it will make any big difference. With such a filter installed only transponders between 10.7-11.0GHz and 11.7-11.85GHz could be received.

>
>I had a thread recently regarding 2 D disappearing
>during parts of the day. Is there a connection here ?

I dont believe so because its quite normal it that there is variations if you are outside the footprint or even on the edge of the footprint.
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Re: Astar 2a & 2b (North & South)Charles23:25:02 11/27/03 Thu

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