Thanks Matt! really precious answer.. actually, transmitting an 8 MHz wide signal at 820MHz without bypassing the ISM filter.. what kind of attenuation should I expect? ..I mean.. just a rough estimate of its magnitude..
thanks vincenzo On Tue, 2008-07-29 at 00:06 -0700, Matt Ettus wrote: > Vincenzo Pellegrini wrote: > > > > Hi everybody, > > just a simple question: > > does the RFX900 provide 200mW just out of the box? Do I have to take > > care of something in particular in order to obtain them? > > > > Actually, what are the appropriate gain values that I should pass to > > subdev.set_gain() n order to maximize correctly the output power? > > > > Sorry for bthering the list with such questions but I was unable to > > have them answered in the RFX900 section of the wiki.. maybe I'll add > > them myself once I'll have fully understood the issue.. > > > That is a saturated power level. For any linear signal you will need to > back off a bit. In any case, you control the output power by > controlling the amplitude of the signal you send to the USRP. +/-32767 > will be the max power but will result in RF clipping. You will need to > find the max power you can get with your particular signal and still > maintain enough linearity. If you need a dB or 2 more, you can bypass > the ISM band filter with a cap of about 100pF and then cut the traces to > the filter. > > Matt > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
