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[Discuss-gnuradio] Power,Bandwi dth and spectrum switch problems

From: Johnson_lu
Subject: [Discuss-gnuradio] Power,Bandwi dth and spectrum switch problems
Date: Tue, 29 Jun 2010 23:23:36 -0700 (PDT)

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

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: 
        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                     

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