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.) Don't forget that your tuner also has maybe +/-50ppm tolerance. The errors can add up. Johannes _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
