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by Weixian Zhou :: Rate this Message:

Sorry haven't post the previous discussion. I took Josh's suggestion and it didn't change anything. The spectrum in uhd_fft of tunnel.py at 2.412G and 2.512G (with same bit rate 0.1M) are nearly the same. But tunnel.py works only at 2.512G.

The screenshots are attached.

---------- Forwarded message ----------
From: Weixian Zhou <ideazwx@...>
Date: Mon, Jun 25, 2012 at 5:24 PM
Subject: Re: [Discuss-gnuradio] tunnel.py doesn't work on expected frequency
To: josh@...

Hi Josh,

I think it's not the problem of uhd. I updated uhd (replace 1 line code in db_xcvr2450.cpp), and under uhd/host:

make clean

cmake ../

make clean

make

sudo make install

But the problem still exists. In addition, when I run uhd_fft on machine A and run tunnel.py on machine B in frequency 2.4x GHz, I can see the peak appears. It means the transmitting works well but failed to receive.

On Wed, Jun 20, 2012 at 5:10 PM, Josh Blum <josh@...> wrote:

On 06/20/2012 08:16 AM, Weixian Zhou wrote:
> I am using UHD_003.004.001-129-g23344268 and
> UHD_003.004.002-128-g12f7a5c9。Is it out of date?
>

I recommend to update. -josh

> On Tue, Jun 19, 2012 at 6:05 PM, Josh Blum <josh@...> wrote:
>
>>
>>
>> On 06/19/2012 02:30 PM, Weixian Zhou wrote:
>>> I am using two USRP N210s (daughter boards are XCVR2450) and the
>> supported
>>> frequency in theory ranged in 2.4GHz ~ 2.5GHz. I have done experiment to
>>> test the working freq using benchmark_tx/benchmark_rx, the working freq
>> is
>>> 2.41G, 2,42G, 243G, 2.44G, 2.46G, 2.47G, 2.48G, 2.49G, 2.50G, 2.51G,
>> 2.52G.
>>> But when I tested tunnel.py, the working freq is only 2.50 G and 2.51G.
>> Why
>>> doesn't tunnel.py work on the same frequencies as
>> benchmark_tx/benchmark_rx?
>>>
>>>
>>
>> I believe there was a bug that was fixed if you see this thread:
>> http://www.ruby-forum.com/topic/4402826
>>
>> What version of UHD are you running? If you update to latest
>> master/maint you will get this fix. I think it is worth trying.
>>
>> -josh
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> Discuss-gnuradio@...
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>
>
>
>

Regards,

Weixian Zhou

Regards,

Weixian Zhou

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uhd_fft_2.412G.png (102K) Download Attachment

uhd_fft_2.512G.png (101K) Download Attachment

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