[linux-dvb] [linux-dvb]Re: DVB on analog LNB?

[Frank Klingenhoefer <frank.private@t-online.de>]

> Hi,
> please excuse my probably stupid question,
> but since I dont know, if the LNB mounted on the top of the
> whole house is analog or universal and considering the 
> worst case - analog LNB, I would like to know, if there is
> a chance to get any DVB program on it to check my DVR?
> How could I check the LNB on the cable?

It's possible.
I have done that. But it depends on the satellite.

AFAIK, the voltage is used to switch the polarization and a 22 kHz
signal is used to switch  high/low band.

Simply try out to receive [all possible] DVB programs [of "your"
satellite]. If you have success, you have a universal LNB.

If you have only an analog DVB, you can receive DVB programs on
transponders sending in the low band of your satellite [if there are
any]. But you could do some "optimization". Let me explaine it on an
example:

Used Configuration file:  $/apps/dvbrc.astra

LNB ID 0 TYPE 1  LOF1 9750000 LOF2 10600000 SLOF 11700000 DISEQCNR 0
  SAT ID 192 NAME "Astra" LNBID 0 FMIN 11700000 FMAX 12800000
    TRANSPONDER ID 3 SATID 192 TYPE 1 FREQ 11720000 POL H SRATE 27500000
FEC 2
....
    TRANSPONDER ID 44d SATID 192 TYPE 1 FREQ 11837000 POL H SRATE
27500000 FEC 2
      CHANNEL ID 39 NAME "ARD" SATID 0192 TPID 44d SID 6dca TYPE 0 VP...
      CHANNEL ID 3a NAME "Bayerisches Fernsehen" SATID 0192 TPID 44d SID
6...

I was not able to receive the channel "ARD" on an analog LNB with the
above settings. I tried to adjust SLOF (frequence, which decides using
low or high band).

LNB ID 0 TYPE 1  LOF1 9750000 LOF2 10600000 SLOF 12700000 DISEQCNR 0
                                                  ^^^^^^^
  SAT ID 192 NAME "Astra" LNBID 0 FMIN 11700000 FMAX 12800000
    TRANSPONDER ID 3 SATID 192 TYPE 1 FREQ 11720000 POL H SRATE 27500000
FEC 2
....
    TRANSPONDER ID 44d SATID 192 TYPE 1 FREQ 11837000 POL H SRATE
27500000 FEC 2
      CHANNEL ID 39 NAME "ARD" SATID 0192 TPID 44d SID 6dca TYPE 0 VP...
      CHANNEL ID 3a NAME "Bayerisches Fernsehen" SATID 0192 TPID 44d SID
6...

Now, it was possible to receive the transponder having in mind [and a
few other]. But I suppose it depends highly on your equipment how far
you can extend the capabilities of your system.


Frank


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