[linux-dvb] TDA10086 with Pinnacle 400e tuning broken

André Weidemann Andre.Weidemann at web.de
Wed Feb 6 09:17:18 CET 2008

Hartmut Hackmann wrote:

> Are you sure that it is a lnbp21 on your board?
> What kind of satellite equipment do you have?
> - a single LNB, so the 22kHz tone is enough.
> - a Multiswitch?
>   if yes, which commands does it need / understand?
>   - nothing but the tone?
>   - a tone burst to switch between satellites and the tone?
>   - full diseqc (2?) serial messages?
> I got a board with tda10086 and lnbp21 let and started measuring.
> voltage switching and static tone work fine with the current
> configuration.

Hi Hartmut,
I got the same tuning problems as Patrick. After your patch the Pinnacle 
400e is not working anymore. I can get a signal, but no lock at all.
I took a look at the PCB and there is definitely an LNBP21PD soldered 
onto it.
Your patch disables the modulation of the 22kHz signal inside the demod 
as fas as I understood, but then the LNBP21PD was supposed to generate it.

Unfortunately this is not possible with the Pinnacle 400e. I took a look 
at the LNBP21PD datasheet which states, that DSQIN is supposed to be 
connected to GND if you don't want the 22kHz signal to be generated by 
the LNBP21 itself. Guess what?! Pin 14(DSQIN) is connected to GND.

For the time being I reverted your patch on my local system and the 
Pinnacle 400e is working flawlessly again.


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