[linux-dvb] szap2 and Band L???

armel frey armel.frey at gmail.com
Thu May 7 15:18:45 CEST 2009


I have put the LO frequency in the low range of Universal Ku band LNBs to 0
and when i try to tune my card in DVB-S2 I don't have the error message

Yet, I have an other problem...
If I try to tune my card to catch my DVB-S2 signal with the parameter DVB-S2
démodulation on szap-s2 (that seems normal...), szap-s2 don't see and don't
lock anything.
But, if I try to tune my card to catch the same DVB-S2 signal with the
parameter DVB-S demodulation on szap-s2, it lock the signal well ... of
course, it doesn't succeed to demodulated.
That why I guess my problem is linked to the frontend, but I don't know how
to check and correct...
If someone have an idea?

For more information, in one hand, I have an Dektec Dta-107S2 modulator
card, and on the other hand I have an Hauppauge HVR-4000.

The application szap-s2 I try to use is :


2009/5/7 BOUWSMA Barry <freebeer.bouwsma at gmail.com>

> On Wed, 6 May 2009, armel frey wrote:
> > I have a Hauppauge HVR-4000 and i would like to receive DVB-S2 !
> > The card works well in DVB-S and seems to work with szap-s2, but my
> problem
> > is that i have to receive DVB-S2 in Band L (950...2150MHz) and szap2
> don't
> > tune this low fréquency.
> When I see the range of 950-2150MHz, I think of the intermediate
> frequency delivered from mixing the local oscillator with the
> received signal, which is passed from the LNB output through
> the attached cable.
> In reality, this is what is tuned, although most commonly one
> makes use of the frequencies of the Ku band, which the tuning
> utility then converts to the IF frequency:
> tuning DVB-S to Freq: 2062000, Pol:H Srate=22000000, 22kHz tone=off, LNB: 1
> Event:  Frequency: 12662350
> The same should be true for an LNB/dish to receive C-Band
> signals, for example, something I've not had any personal
> experience, so I don't know how well it would be supported
> by the different utilities.
> Do you have an example of a particular DVB-S2 service which
> you want to receive?
> My guess would be that if you need to tune a particular
> frequency in that range, say, 2062MHz in the above example,
> you can achieve this by adding 9750 MHz -- the LO frequency
> in the low range of Universal Ku band LNBs, and then
> attempting to tune that frequency, whether that comes as the
> IF from a Ku, or C or Ka band LNB of whatever type -- Universal
> or otherwise.
> Though I should hope that some utility will directly support
> specifying a frequency within the above bands directly, if
> that's what you're trying to do, or a non-universal-LNB LO
> frequency...
> barry bouwsma
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