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 _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
