On Thu, 2008-01-31 at 11:33 -0800, Matt Ettus wrote: > Kshitij Kumar Singh wrote: > > Hi, > > > > I tried out a simple script to get the gain range of the USRP (I had read > > in earlier mail archive > > that we were provided a single gain knob to tune over the entire range of 0 > > to 90 dB): > > > > There is no gain control on transmit with the RFX boards. There is 90dB > of gain range on the RECEIVE side. > > To change transmit power, you need to lower the level of the signal you > send. So +/-32767 is max power, +/-16383 is 6dB less power, +/-8192 is > 12 dB less power, etc. > > Matt Thanks Matt .. I was just trying out things by myself after reading usrp_siggen.py and got had these few doubts. I had another question regarding the 'u.tune()' method. Let me explain my problem. I tried generating a sinusoid at 2.39G. I got a DUC frequency of -43M. The tuning results were: Baseband: 2.396G, DUC freq = -6M. I understand that since we use an IF, our LO on the RFX board was tuned to 2.396G ( goes from 2.3 to 2.7G in steps of 4M), the IF came in at around 6M so we got 2.396+0.006 and 2.396-0.006 and chose the latter. Is this correct? But what about the -43M from usrp.calc_dxc_freq() ? I also tried transmitting at 2.396+6= 2.402G but then the tuning results were: Baseband:2.408,DUC=-6M. Why always a negative DUC freq(why not 2.396 +0.006)? Could you please explain this "tuning is a two step process" using a small numerical example? Thanks in advance and sorry for bugging you guys constantly. I tried reading usrp.py but got confused.
Regards, Kshitij _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio