[vdr] Re: burned DVB-s

[Roberto Deza <rdeza@unav.es>]

Hi,

At 11:59 18/10/2002 +0200, Rienecker, Fa. Evenio, ITS P, M wrote:
>
>> -----Original Message-----
>> From: domolink morocco [mailto:domolink@iam.net.ma]
>> Sent: Friday, October 18, 2002 11:50 AM
>> To: vdr@linuxtv.org
>> Subject: [vdr] Re: burned DVB-s
>> 
>> 
>> Hi all
>> can we say tha t the common ground of the RCA wire that 
>> connect video output
>> of a dvb rev1.3 to the RCA of the TV entry is enough grounded 
>> to be called
>> common groung or do we need to connect another free wire 
>> between all the
>> coponent to make sure a 100% that everything is grounded ??
>> 
>> Tx MedMed

The best, IMHO, is to have a extra wire, as not ever the connectors on
both ends are RCA and anyway the plug could put in contact the "active"
signal wire *before* connect the ground :-(.

>That should be enough except if you start to unplug it and replug it while
the system has power....

A warning here is that many devices have a power line filter that is
directly on the power connector, before the power button; then, the
system can be Powered_Off, but the risks are the same!, if the power cord
is pluged. The reason of this is that this filters commonly have two
small capacitors wired to the ground of the device; this capacitors allow
to pass a very small current that could break other to be connected 
device, if the grounds are not connected *first*.


<other messages>

The ground of the other wires (antena, composite video) is enought to
connect the devices, but the problem is that not ever the ground pin
could be the first connected or that some of this cables can be not
connected at one time (ie, for a "fast test" :-( ).

So, it's *worth* to have an extra permanent cable :-).


Best regards:
--
Roberto Deza Asensio
Universidad de Navarra
Data Procesing Center
rdeza@unav.es


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