Hi , If any one can tell me in USRP1 ver4.5, how many layer PCB used , i examined it and it looks like it is double sided PCB,
or it has multiple layers,like 6 layers? Thanks in advance for confirmation. Kind Regards, On 11/20/10, Marten Christophe <[email protected]> wrote: > Hi , > > If any one can tell me in USRP1 ver4.5, how many layer PCB used , i > examined > it and it looks like it is double sided PCB, > > or it has multiple layers,like 6 layers? > Thanks in advance for confirmation. > > Kind Regards, > > On Fri, Nov 19, 2010 at 2:31 PM, Eric Blossom <[email protected]> wrote: > >> On Fri, Nov 19, 2010 at 05:17:53PM +0900, Songsong Gee wrote: >> > I use USRP sink and source and set frequency with 2.6 GHz >> > When I run a flow graph, I see like below: >> > ============================================== >> > A: Flex 2400 Tx MIMO B >> > r.baseband_frequency = 2604000000.0 >> > r.dxc_frequency = -4000000.0 >> > r.residual_frequency = 0.0 >> > r.inverted = False >> > >> > A: Flex 2400 Rx MIMO B >> > r.baseband_frequency = 2596000000.0 >> > r.dxc_frequency = -4000000.0 >> > r.residual_frequency = 0.0 >> > r.inverted = False >> > =============================================== >> > Both of baseband frequency are near 2.6 G, but they do not match up >> > Can it be problmeatic for communicating each other? >> >> The actual frequencies on the air will be 2.6 G +/- oscillator tolerance. >> >> In the Tx case, the LO is set 4MHz higher than the target, and the >> DUC is used to adjust the baseband -4MHz. >> >> In the Rx case the LO is set 4MHz lower than the target, and the DDC >> is used to move the digitized IF signal 4MHz lower prior to decimating. >> >> This is easy to confirm with a siggen and a spectrum analyzer. >> >> Eric >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
