Thanks for Eric's reply. I tried the frequency switch without lock/unlock, the switches works well, no failures happen again.
Eric Blossom wrote: > > 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 > > -- View this message in context: http://old.nabble.com/Power%EF%BC%8CBandwidth-and-spectrum-switch-problems-tp29031239p29045631.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
