Re: [Discuss-gnuradio] UHD source (data keeps being sent)

[UB]

(please discard the just previous post, i had made)
I tried your suggestion Marcus. I don't find any peak with the GnuRadio,
when I construct a flow graph and stop the flow-graph. But when I do run my
tx script and even after python returns call to the system, the uhd_fft.py
keeps getting the peak at centre frequency, that means the tx USRP keeps on
sending the data, for a loong time.. Please HELP !

Uzair Baig

Marcus D. Leech wrote:
> 
>> I have two USRP1 (each connected to a laptop), separated 30cm apart. Each
>> have a single Antenna connected to  RFX2400 daughter card. I am running
>> Ubuntu LTS version. I downloaded GnuRadio+UHD from your (Marcus Leech)
>> script 2 months ago.
>> Below are the details of my GnuRadio version:
>> MAJOR_VERSION=3
>> API_COMPAT=4
>> MINOR_VERSION=2
>> MAINT_VERSION=git
>> Now I am not sure how to find the information of my UHD drivers. (I
>> installed using your script, with no other changes, so it will be exactly
>> the same, as in the script). I am sending some samples (all zeros or
>> ones,
>> using a vector source) to a UHD sink. The data does get sent, and
>> received
>> not once, but more than once, in the UHD source (connected to the other
>> laptop). And even after my code stops, and I try to capture data again,
>> using the UHD source, I get similar data, until after a 3-4 minutes later
>> (when its just noise again) or I have switched off the power supply of my
>> USRP1 that is a UHD sink.
>>
>> My flow graph is pretty simple. UHD sink is in the tx.py file (
>> http://old.nabble.com/file/p33045005/tx.py tx.py ), and UHD source in the
>> rx.py ( http://old.nabble.com/file/p33045005/rx.py rx.py ) file. I am
>> attaching those. To make sure I get all the samples, I run the rx.py file
>> for many symbols (as compared to the number of symbols being sent).
>>
>> Yes, right now, I am just using my vector sources and sinks for initial
>> testing to get an idea, I plan to shift to a file source.
>>
> 
>> UB
>>
> OK, so heres an idea.  Rather than having people here debugging your 
> code, why don't you try a very simple experiment.
> 
> On the TX side, construct a simple flow-graph that emits a single tone 
> at your chosen frequency--you should be able to whip that
>    up in GRC in about 30 seconds.
> 
> On the RX side, use uhd_fft.py to observe that tone.
> 
> Then, stop the TX side.  Do you still see the tone?
> 
> 
> 
> 
> -- 
> Marcus Leech
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
> 
> 
> 
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> 
> 

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