From: Reinhard Nissl <rnissl@gmx.de>
To: linux-media@vger.kernel.org
Subject: stb0899: no lock on dvb-s2 transponders in SCR environment
Date: Sat, 27 Apr 2013 14:14:22 +0200 [thread overview]
Message-ID: <517BC11E.50105@gmx.de> (raw)
Hi,
my stb0899 card works properly on dvb-s and dvb-s2 transponders
when using a direct port on my sat multiswitch.
When using a SCR port on that multiswitch and changing VDR's
config files accordingly, it only locks on dvb-s transponders.
A SCR converts the selected transponder's frequency after the LNB
(IF1) to a fixed frequency (for example 1076 MHz) by mixing the
signal with a local oscialator frequency above IF1 so that the
lower sideband of the mixing product appears at 1076 MHz.
The lower sideband's spectrum is mirrored compared to the upper
sideband, which is identical to the original spectrum on the
original IF1.
Could that be the reason why the stb0899 cannot lock on dvb-s2
transponders in an SCR environment?
Any ideas on how to get a lock on dvb-s2 transponders?
Bye.
--
Dipl.-Inform. (FH) Reinhard Nissl
mailto:rnissl@gmx.de
next reply other threads:[~2013-04-27 12:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-27 12:14 Reinhard Nissl [this message]
2013-04-27 14:51 ` [linux-media] stb0899: no lock on dvb-s2 transponders in SCR environment Klaus Schmidinger
2013-05-05 11:21 ` [linux-media] " Reinhard Nissl
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