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Re: [Discuss-gnuradio] Power,Band width and spectrum switch problems
From: |
Johnson_lu |
Subject: |
Re: [Discuss-gnuradio] Power,Band width and spectrum switch problems |
Date: |
Thu, 1 Jul 2010 06:21:21 -0700 (PDT) |
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
>
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>
>
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