# Siggen.py transmission Error

**URL:** <https://www.ruby-forum.com/t/siggen-py-transmission-error/221626>\
**Category:** GNU Radio\
**Created:** [July 23, 2012, 12:07pm UTC](https://www.ruby-forum.com/t/siggen-py-transmission-error/221626 "2012-07-23T12:07:42Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\
**Post date:** [July 23, 2012, 12:07pm UTC](https://www.ruby-forum.com/t/siggen-py-transmission-error/221626/1 "2012-07-23T12:07:42Z")

</div>

i m trying to transmit simple sin wave to check my usrp transmission  
reception .  
when i run usrp\_siggen.py -f 900M → " Using TX d’board A: " is  
displayed on terminal.  
when i run usrp\_fft.py -f 900M → Failed to set RF initial frequency  
is  
displayed in " FFT GUI "+ " u0u0u0u0… " is displayed in terminal.

i m using gnu radio 3.2.2  
USRP1  
D.Boards Flex900.  
fujitsu core i7 (as i have read that u0u0u0u0 is due to low performance  
P.C  
)  
Need Your Help plz.

Regards  
Bilal Nasir.

–  
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---

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**Author:** ![bilal\_n](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/eada6e/32.png) [@bilal\_n](https://www.ruby-forum.com/u/bilal_n)\
**Post date:** [July 29, 2012, 4:08pm UTC](https://www.ruby-forum.com/t/siggen-py-transmission-error/221626/2 "2012-07-29T16:08:23Z")

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On Mon, Jul 23, 2012 at 6:06 AM, Abbasi [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> D.Boards Flex900.  
> fujitsu core i7 (as i have read that u0u0u0u0 is due to low performance P.C  
> )  
> Need Your Help plz.
> 
> Regards  
> Bilal Nasir.

Bilal,

It looks like you are using the wrong side of the USRP. The " Using TX  
d’board A: " is a clue. I expect that your daughterboard is  
plugged into side B of the USRP, so you need to tell the program that  
using the “-T B” flag.

Tom

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<div class="post-metadata">

**Author:** ![bilal\_n](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/eada6e/32.png) [@bilal\_n](https://www.ruby-forum.com/u/bilal_n)\
**Post date:** [August 1, 2012, 2:49pm UTC](https://www.ruby-forum.com/t/siggen-py-transmission-error/221626/3 "2012-08-01T14:49:01Z")

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Tom R.-2 wrote:

> > i m using gnu radio 3.2.2  
> > Bilal,  
> > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
> > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio)

I have 2 daughter boards so i think it does not matter if i dont specify  
-T  
B and plz tell me why " Failed to set RF initial frequency " is  
displayed  
in FFT GUI + " u0u0u0u0… " is displayed in terminal.

–  
View this message in context:  
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Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com).