Simple transmit


#1

I’m a new user to GNU radio and the USRP and all I want to do is simply
transmit a tone. I tried creating my own simple example based on the
dsb_tx.py example in the usrp examples folder. I tried using a
gr.sig_source_c as the source rather than an audio file, and connecting
that to the usrp.sink_c, and then connect the basictx daughterbaord to
an oscilloscope, but I couldn’t get it to work. Any help would be
appreciated.

Nick


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#2

On Mon, Jan 29, 2007 at 03:27:10PM -0500, removed_email_address@domain.invalid wrote:

I’m a new user to GNU radio and the USRP

Welcome!

and all I want to do is
simply transmit a tone. I tried creating my own simple example
based on the dsb_tx.py example in the usrp examples folder. I tried
using a gr.sig_source_c as the source rather than an audio file, and
connecting that to the usrp.sink_c, and then connect the basictx
daughterbaord to an oscilloscope, but I couldn’t get it to work.
Any help would be appreciated.

I’ve removed the incorrect dbs_tx.py code so that it’ll never confuse
another person :wink:

The simplest tx example (which is much more complicated than you are
looking for) if fm_tx4.py. It generates N FM modulated signals. It
also has a dependency on some audio files which aren’t supplied (yes,
this is bad).

However, it does handle all the daughterboard and mux correctly.
sig_source_c to usrp.sink_c should work fine. Just be sure to copy
the setup code correctly.

You could also take a look at usrp_siggen.py.

Note too that the output from the Basic Tx daughteboard is very low,
about 50mV.

Eric