On Tue, Feb 20, 2007 at 03:41:31PM +0100, anmar wrote:
we have been searching for a way to transmit two independent signals one
on TxA and the other on TxB.
Using two daughterboards, you can send different complex baseband
signals out the A side d’board and the B side d’board. You must set
nchan=2 in the usrp.sink_c constructor, and provide an interleaved
stream of complexes. (Yes, the interface is a bit strange and ought
to be revisited/fixed.) You can create the interleaved output stream
u = usrp.sink_c(nchan=2, interp_rate=)
interleaver = gr.interleave(gr.sizeof_gr_complex)
fg.connect(src0, (interleaver, 0))
fg.connect(src1, (interleaver, 1))
r0 = u.tune(0, u.db, freq_0) # set center freq on side A
r1 = u.tune(1, u.db, freq_1) # set center freq on side B
we have read the Tx_MUX documentation and tried some settings but we
only could send two different frequencies two only 80khz!!! and we
always have had two signals!
what we like to do is is to chose the “two independent real signal” mode
on the AD9862, how can we do that, just change the AD9862.h, or some
different approach? if yes how to load it to the USRP.
reading some of the forum questions, we understand that the gnuradio
have the “Dual channel complex” mode and changing it would give
conflicts with the FPGA and the software.
That’s right. If you’re using a single Basic Tx daughterboard, and
you want independent real output out the I and Q, that’ll take a fair
amount of hacking. Using two daughterboards is going to be much, much
is there some thing that we’re missing or just not understanding.
Wim & anmar