Re: Eutelsat 2 - BBC radio problems -- The Astra 2D Forum

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Subject: Re: Eutelsat 2 - BBC radio problems

Author:
Outsider

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Date Posted: 13:42:03 11/29/03 Sat
In reply to: Chris Pollard 's message, "Re: Eutelsat 2 - BBC radio problems" on 10:10:55 11/29/03 Sat

>>>I had good BBC Radio reception on Eutelsat 2 after
>>>following your advice. Yesterday I fitted an extra
>>>lnb to the dish to get Hotbird and this morning the
>>>radio keeps cutting out. BBC World Service tv from
>>>Hotbird appears to be fine. Is anyone else having
>>>these problems today. Any ideas please. I should
>>>perhaps point out that there is persistent rain today
>>>in Malta - could that be a problem?
>>>
>>>Thanks
>>>
>>>Chris
>>
>>Certainly rain impairs satellite reception.
>>
>>You didn't say you did you add the second LNB but
>>because Eutelsat W2 apparenly is weaker of the two,
>>you should keep the LNB for it in the certer positon
>>and put the Hotbird LNB three degrees off. Then W2
>>shouldn't get any worse.
>>
>>Slighly wondering how you in the first place managed
>>to do it, at least with small dishes separation of
>>only three degrees between satellites requires some
>>special LNBs, you just cannot get normal LNBs close
>>enough. Actually, I would like to put an LNB for W2
>>between Astra 19.2E and Hotbird LNBs but no awail,
>>there's no space for the third LNB between the two
>>existing ones.
>
>I had been told that it was impossible to fit another
>lnb in but just took no notice and bought a bracket
>and a new lnb and when I set it up was lucky and got
>Hotbird straightaway. I didn't move the dish so the
>Eutelsat is still central. However I'm wondering if
>the fact that the lnbs are different could make a
>difference. The strange thing is that the signal is
>very strong on the BBC feed transponder and then
>disappears. When I take the new lnb off the signal
>still drops out but the receiver manages to recover
>and continue. Any more ideas most welcome!

The problem with dualfeed for Hotbird and Eutelsat W2 is that correct distance between LNBs e.g. on 85cm dish is just around 30mm, the diameter of typical feedhorns being some 60mm, it's just impossible to get the correct distance between LNBs. For Hotbird/Astra 19.2 the correct distance would be around 60mm, i.e. the LNBs are just side by side. It seems to me that either one of the LNBs must be in incorrect place, in some direction, unless the dish is essentially larger, then the correct distance between LNBs of course becomes larger, too.

There has been special LNBs with different type of feedhorn for this purpose but I think they are quite rare. Of course a motorised system would solve also this problem (but create few new of its own).

This will likely not help you but I'm just a bit confused how you have actually done it.

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Replies:

Subject	Author	Date
Re: Eutelsat 2 - BBC radio problems	Chris Pollard	21:51:53 11/29/03 Sat
Re: Eutelsat 2 - BBC radio problems SOLVED?? -- Chris Pollard, 03:50:29 11/30/03 Sun Re: Eutelsat 2 - BBC radio problems -- Outsider, 06:24:38 11/30/03 Sun