Error Running uhd_tx_dpsk.grc and uhd_rx_dpsk.grc

GNU Radio
1

Hi everyone,

I have just started on GNURadio for an undergraduate project and I would
require a little assistance.

I tried to run the dpsk transmitter and receiver examples, found in
gnuradio/examples/uhd/uhd_rx_dpsk.grc and
gnuradio/examples/uhd/uhd_tx_dpsk.grc. I am using the N210 USRP with the
WBX
daughterboard and the VERT2450 antenna, with GNURadio version 3.6.0
running
on Ubuntu 12.04 LTS.

When I run the transmit file, I receive the following error:
Traceback (most recent call last):
File “/tmp/uhd_tx_dpsk.py”, line 234, in
tb = uhd_tx_dpsk(samp_rate=options.samp_rate, freq=options.freq,
gain=options.gain, address=options.address)
File “/tmp/uhd_tx_dpsk.py”, line 150, in init
log=False)
File “/usr/lib/python2.7/dist-packages/gnuradio/digital/qpsk.py”, line
139, in init
*args, **kwargs)
TypeError: init() got an unexpected keyword argument ‘mod_code’

When I run the receive file, I receive the following error:
Traceback (most recent call last):
File “/tmp/uhd_rx_dpsk.py”, line 327, in
tb = uhd_rx_dpsk(samp_rate=options.samp_rate, freq=options.freq,
gain=options.gain, address=options.address,
freq_offset=options.freq_offset)
File “/tmp/uhd_rx_dpsk.py”, line 217, in init
log=False
File “/usr/lib/python2.7/dist-packages/gnuradio/digital/qpsk.py”, line
165, in init
*args, **kwargs)
TypeError: init() got an unexpected keyword argument ‘mod_code’

Both errors look similar and have something to do with “mod_code”. Does
anyone know how to solve it? Also, any suggestions on another GRC
receive/transmit example I can use to test out my N210 USRP boards?
Thank
you very much!

Tan Chong Min
Undergraduate
National University of Singapore

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2

On 07/13/2012 01:08 AM, chongmin wrote:

on Ubuntu 12.04 LTS.
*args, **kwargs)
TypeError: init() got an unexpected keyword argument ‘mod_code’

I believe that this grc file has suffered bit rot due to new
developments in the code, specifically gr-digital component. I think Tom
would know whats missing.

Both errors look similar and have something to do with “mod_code”. Does
anyone know how to solve it? Also, any suggestions on another GRC
receive/transmit example I can use to test out my N210 USRP boards? Thank
you very much!

If you happen to have a spectrum analyzer and signal generator. Its
often very nice to make a simple GRC app that sends and receives a test
tone.

Be careful if you plan to loopback TX into RX port on the daughterboard.
Use low gain and lots of attenuation!

-josh

3

Dear Martin and Josh,

Thank you for your assistance. I realized the error was that I
downloaded a
binary which was outdated. After using the build-gnuradio script by
Marcus,
the error is no longer there.

Chong Min

chongmin wrote:

running on Ubuntu 12.04 LTS.
*args, **kwargs)
File “/usr/lib/python2.7/dist-packages/gnuradio/digital/qpsk.py”, line
Undergraduate
National University of Singapore

–
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4

On Fri, Jul 13, 2012 at 01:08:12AM -0700, chongmin wrote:

TypeError: init() got an unexpected keyword argument ‘mod_code’
Hi chongmin,

pull a recent git, it should be fixed there.

MB

Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin B.
Research Associate

Kaiserstraße 12
Building 05.01
76131 Karlsruhe

Phone: +49 721 608-43790
Fax: +49 721 608-46071
www.cel.kit.edu

KIT – University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association