[linux-dvb] Some thoughts and questions

Manu Abraham abraham.manu at gmail.com
Sun Sep 30 04:48:31 CEST 2007


Manu Abraham wrote:
> Johannes Stezenbach wrote:
>> On Sat, Sep 29, 2007, Manu Abraham wrote:
>>> Johannes Stezenbach wrote:
>>>> - LNBs have a constant error plus a temperature drift
>>>>   (e.g. +/-1MHz error, +/-3Mhz drift for a temperature range
>>>>   of -40 ... +60 °C -- cheap no name equipment usually worse)
>>> This is the old LNB, the one's we use are generally based on PLL's
>>> have some 15 - 20k drift
>> If you make that 20kHz per °K then it's about the usual range
>> for Ku Band, maybe slightly better than average.
>> (An LNB with +/-20KHz drift over the full temperature range
>> would be ridiculously expensive.)
> 
> ACK
> 
> didn't account for the / K. But still for a LNB with 27 K, It amounts to around +/- 0.5MHz
> Which is still quite small for a 5 - 10 MHz window.
> 
> As you said, maybe there are really bad ones with +/-1MHz drift, but i think
> +/-3MHz is a bit too exaggerated figure
> 


http://www.satcomresources.com/SatelliteLnbs.jsp
http://www.servsat.com/eng/htmls/lnb%20English.htm

with Prices

Manu



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