[linux-dvb] Re: Low Symbol Rate problem STV0299

["Vidya Srinivas" <vidya.s@bpltelecom.com>]

Hi,

  I tried using some capacitors like 100mfd,470mfd etc directly at the
tuner pins. It did not help. ripple at the supply is around +/- 50mv. I
want to tune to 3255KS/s(sym rate) and 3580MHz(freq). I am Using a scope
of ~400MHz bandwidth.

Regards,
Vidya


> Vidya Srinivas wrote:
>> Hi,
>>
>>    Thanks for the response. I have checked the power supply and it is
>> stable.
>
> Have you checked for RF ripple introduced by switching power supplies?
> Use a scope of ~100MHz bandwidth or higher. Or just believe me and try
> adding some fat lowESR caps directly at the tuner pins.
>
> By playing and experimenting you can distinguish which ones are really
> required, probably only a pretty small and cheap cap at the 5V tuner
> supply line will do it at the end...
>
>> We have designed our own satellite receiver. We are using
>> SU1200 MK2 series.
>
> yes.
>
>> Anything else i can check? Anything else in software
>> special for low bit rates?
>
> no.
>
> Holger


-- 
Vidya.S
BPL TELECOM LTD
11th KM, Arikere
Bannergatta Road,
Bangalore - 560072
email - vidya.s@bpltelecom.com
Ph - 6589080 extn - 2005




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