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 >
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