Re: Panasonic TU DSB20 -- The Astra 2D Forum

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Subject: Re: Panasonic TU DSB20

Author:
Bitman

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Date Posted: 03:26:21 01/15/04 Thu
In reply to: Outsider 's message, "Re: Panasonic TU DSB20" on 05:38:03 01/14/04 Wed

>>Thanks for the reply JVT, did mail Martin, have dealt
>>with him in the past, always quick and reliable. He
>>sent me this reply:-
>>
>>>The design fault prevents the receiver from switching
>>>to low band reliably. It has a major effect on low
>>>band reception - often you don't get any!
>>
>>What does this mean in laymans terms, can you
>>translate?? Thanks
>>Simon
>
>I think he said it in laymans terms ;-) but to be a
>bit more precise: The receiver commands the LNB to
>high-band by sending a 22kHz 'tone' signal,
>superimposed on the LNB supply voltage. These boxes
>'leak' this tone-signal even if there should be none
>and then LNB goes to high band even if it should stay
>on low-band and of course receiving satellite signal
>from low-band then fails. They have some kit that
>fixes it.

To add to the explanation:
The reason this is particularly relevant to Astra 2D is that all transponders on that satellite send on frequencies in the low band.
There are also, however, a few low band transponders on the wide-beam satellites.
For example, if you can get Performance channel reliably, then your box is switching to low band OK.

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