[Discuss-gnuradio] Power，Bandwidth and spectrum switch problems

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()

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