On Sun, Sep 30, 2007 at 06:48:31AM +0400, Manu Abraham wrote: > 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 And compare to the prices here: http://www.hardwareschotte.de/preise.php3?seachrange=all&searchstring=lnb http://www.shoppingfever.de/product_info.php?products_id=271159&campaign=hardwareschotte This is starting to get silly... Johannes _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
