On Tue, Jun 29, 2010 at 11:23:36PM -0700, Johnson_lu wrote: > > Hi guys， > Could anybody can help me for these problems？ > 1、I varied Tx_amplitude from 0.1 to 1 and measured the output with a > spectrum analyzer. But the changes are very little. The output is almost the > same when Tx_amplitude is 0.1 and 1. How can I reduce the transmit power to > a very little value? > > 2、How do I know bandwidth of transmission and reception channels in > tunnel.py? > > 3、I am using an USRP2 with Gnu Radio and XCVR2450 as daughterboard. I want > to switch frequency among different channels 2.4G~2.5G. However, I find that > switch only can succeed about 20 times, then fails. > The python code is: > self.tb.lock() > ok = self.tb.txpath.set_freq(new_freq) > if not ok: > print "Failed to set Tx frequency" > raise SystemExit > ok = self.tb.rxpath.set_freq(new_freq) > if not ok: > print "Failed to set Rx frequency" > raise SystemExit > self.tb.unlock()
FWIW, there's no need to use lock/unlock to change the frequency. You only need to use those when you are reconfiguring the topology of the graph. Try it without those and see if it works. Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
