[vdr] Re: Second nexus-S

[Roberto Deza <rdeza@unav.es>]

Hi,

At 16:20 06/05/2004 +0200, tarass@club-internet.fr wrote:

>> Better,  should be to have the signal of the two dish available to the two
>> cards :-) ; ie, using a Diseqc switch and "twin" LNBs.
>
>Ok, but how plug one cable in two cards ?

This can't be "directly" as each card want to drive the LNB with different
voltage (around 14 or 17V), to select different polaritys; to do it correctly,
you need an 'spliter with DC block in one way'. Anyway, you have the problem
that one card fix the polarity/band and the other can't change this.

A twin LNB have two fully independent connections, for two receivers/cards.

>And how to record simultanously from the two satellites ?

Each card will have a Diseqc switch connected to one of the outputs of the two
LNBs and will do a recording on any of the two satellites.

>> No, as the CAM must receive the whole transport stream (about 5 MByt/Sec)
>> and there is no (standard) way to "inject" it, in the card that have the
CI,
>> from the other :-(.
>
>Then a better choice should be a Nova CI ?

The problem is the same!; For this you would need to connect the output of the
QPSQ demodulator (in the frontend) to the output of the demodulator in the
other card, *after have put this outputs in high impedance*. As this isn't
supported by the standard hardware, you should install some TTL IC's in both
cards, which isn't a task for anybody :-), without forget how control it from
the standard hardware/drivers.


Best regards:
--
Roberto Deza Asensio
Universidad de Navarra
Data Processing Center


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