[linux-dvb] Re: Newby troubles...

[Alessandro Pasotti <apasotti@isoleborromee.it>]

Dear Ralph, thanks for writing 

> Alessandro Pasotti writes:
>  > - LNB: I have two LNB (Astra and HotBird without DiSEqC) and it seems I
>  > can't switch to Astra channels, I get only HotBird. With my previous
>  > analog decoder the switching was automatic: I just set the L.O.F. in the
>  > LNB setup menu and everything was ok.
>
> It does not sound like you have proper digital reception equipment.
> Are you using Universal LNBs? Judging from the frequency offsets you
> observed, probably not.
>
I climbed the roof and checked: you are probably right: one LNB reports only 
LOF 9.75 and the second should be universal because it reports both 9.75 and 
10.6 (the first LNB is old, the second is new). I didn't open the switch box, 
I just will buy a Diseqc 1.0 next week.

> Furthermore, are you switching between LNBs with a 22KHz switch?
> You cannot do that since the Universal LNBs (if or once you have any)
> would need this signal to switch the frequency range. That's why
> DiSEqc is used.

The system was set up for analog, I don't know how the switch work but I see 
that I can watch both Astra and HotBird channels but mostly in the low 
frequency range and with wrong tune values, for example:

From ASTRA 19.2E
-RAI 1	./dvbtune -c 0 -f 10788000 -p v -t 0  -s 22000 -pnr 9004        working
-DW	./dvbtune -c 0 -f 10788000 -p v -t 0  -s 22000 -pnr 9005        working
-SKY NEWS	./dvbtune -c 0 -f 11097000 -p v -t 0  -s 22000 -pnr 
21000       working
-ARD Das Erste	./dvbtune -c 0 -f 11836000 -p h -t 0  -s 27500 -pnr 28106 
      Not able to lock to the signal on the given frequency
-all higher frequesncies not working.......

From HOTBIRD 13E
-102&5	./dvbtune -c 0 -f 12480000 -p v -t 1  -s 27500 -pnr 10704       working 
but it should be under freq. 11623000

Here is the output:

./dvbtune -c 0 -f 12480000 -p v -t 1  -s 27500 -pnr 10704
tuning DVB-S to L-Band:1880000, Pol:V Srate=27500000, 22kHz=on
SEC BUS MODE:  IDLE (0)
SEC VOLTAGE:  13  (2)
SEC CONT TONE: ON
Getting frontend event
Received completion event
Event:  Frequency: 12480000
        SymbolRate: 27500000
        FEC_inner:  0

Bit error rate: 0
Signal strength: 0
SNR: 0
FE_STATUS: FE_HAS_POWER FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER 
FE_HAS_VITERBI FE_HAS_SYNC


MISTERY: why I ask to tune 12480 and it says L-Band: 1880 but it founds a 
channel that should be at 11623 ????

- other HB channels are also working but under wrong freq values, most of them 
cannot be tuned anyway.


It seems that the tone 22khz is used to switch LNB's, I hope that I will solve 
the problem buying a new diseqc switch.

Bye
-- 
Alessandro Pasotti
Isola Bella - Stresa (VB)
Fax: +39 0323 30046
Tel:  +39 0323 30556
http://www.borromeoturismo.it


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