Basic RX

Hello,

I’m new to the GNURadio experience, so I’m just trying to get some of
the
basic tests to work. I’ve installed Ubuntu 6.01, and for the GNU Radio
installation I used the binary packets -
http://gnuradio.org/trac/wiki/UbuntuInstall -.

First of all, I’ve run the dial_tone.py example, and it was ok. Then, I
wanted to use the USRP, so the next example I wanted to test was the
usrp_wfm_rcv.py. I’ve connected a Basic Rx daughterboard to RXB. I write
./usrp_wfm_rcv.py -f 100, I get an error message: FYI: No powermate or
Contour Knob found; http://www.nabble.com/file/p18654189/error_fm.jpg

I’ve tried with other examples, like usrp_am_rcv.py, and it happened the
same error as the fm receiver.
I’ve been reading some old posts from people who have the error “No
powermate …”, and I added “-O plughw: 0,0” but it didn’t happened
anything
different.
Other thing that happend is that the Ubuntu is blocked when I run the
program, it seems that it hasn’t enought memory.

Thanks,
Rita Arencibia

View this message in context:
http://www.nabble.com/Basic-RX.-tp18654189p18654189.html
Sent from the GnuRadio mailing list archive at Nabble.com.

Rita’s pfc wrote am 2008-07-25 17:39:

First of all, I’ve run the dial_tone.py example, and it was ok. Then, I
wanted to use the USRP, so the next example I wanted to test was the
usrp_wfm_rcv.py. I’ve connected a Basic Rx daughterboard to RXB. I write
./usrp_wfm_rcv.py -f 100, I get an error message: FYI: No powermate or
Contour Knob found; http://www.nabble.com/file/p18654189/error_fm.jpg

This is more an information message than error. The Powermate and the
Contour knob, if present, are used for more convenient usage, but the
program still runs without any of them. You can use the interface with
the mouse without a drawback.

Regarding your problem: The option “-f 100” in your command instructs
your program to listen FM at a frequency of 100Hz. The option takes
magnitude suffixes, so you’d rather want “-f 100M”. Choose a frequency
of a strong radio station in your area.

You will not be able to listen so FM radio without a adequate antenna.
For a dipole the receiving length of your antenna should be in the order
of lambda/2, that is c/f/2 = 310^8/110^8/2=1.5m.

Patrick

Engineers motto: cheap, good, fast: choose any two
Patrick S.
Student of Telematik, Techn. University Graz, Austria

Thank you for the answer.
I did what you told me about “-f 100M”, but it happened the same. I
tried to
do with usrp_wfm_rcv_nogui.py and it happened the same. About the
antenna, I
supposed that just a simple peace of metal hooked on the daughterboard
would
be enough. Should I buy a specific antenna for any frequency in FM band
that
I wanted to listen with the Basic RX? Maybe it’s a stupid question.
Sorry
for that.
Thank you


View this message in context:
http://www.nabble.com/Basic-RX.-tp18654189p18694956.html
Sent from the GnuRadio mailing list archive at Nabble.com.

Rita’s pfc wrote am 2008-07-28 19:03:

Thank you for the answer.
I did what you told me about “-f 100M”, but it happened the same. I tried to
do with usrp_wfm_rcv_nogui.py and it happened the same. About the antenna, I
supposed that just a simple peace of metal hooked on the daughterboard would
be enough. Should I buy a specific antenna for any frequency in FM band that
I wanted to listen with the Basic RX? Maybe it’s a stupid question.

No Stupid Question.

Yes, a FM antenna should do, but you have to look for an adaptor, could
be tricky.

Your screenshot just hides the relevant information from the console,
but moreover it’s more useful to have a text copy of what’s going on on
your terminal.

Seems like the application is kind of hung.
Tell us more about your setup:

OS? Distribution? Version?
Version of GNU Radio you are using?
Hardware: RAM, CPU?

Open a system monitor before starting the application and watch memory
and CPU consumptions. I can hardly listen to FM with my PII 450MHz.

Patrick

Engineers motto: cheap, good, fast: choose any two
Patrick S.
Student of Telematik, Techn. University Graz, Austria

On Tue, Jul 29, 2008 at 11:01 AM, rita pfc
[email protected] wrote:

app = stdgui2.stdapp (wfm_rx_block, "USRP WFM RX")

DISPLAY set properly?)
Fallo de segmentación (core dumped)

I hate to just repeat the error, but is DISPLAY set properly?

You can check this by typing echo $DISPLAY. If you don’t see
something like localhost:0.0, then I don’t think it is set properly.

It appears as if the software is unable to find your X-server. Are
you running X locally? Can you run other X programs from the same
terminal?

Brian

I’ve installed Windows XP, and for an easier installation of GNU Radio,
I
have installed a virtual machine (VM) with Ubuntu 6.1. The PC is a
Pentium 3
GHz, with 2 GB RAM, but for Ubuntu I’ve 1 GB. Do you think is this
enough?
or maybe I must let Ubuntu the hole RAM of my PC. I took the binary
packages
from http://gnuradio.org/trac/wiki/UbuntuInstall
Thanks a lot.


View this message in context:
http://www.nabble.com/Basic-RX.-tp18654189p18696911.html
Sent from the GnuRadio mailing list archive at Nabble.com.

Hello,
I’ve started again from the begining. I have installed Ubuntu 7.1, not
in a
virtual machine. In a Pentium IV, 3 GHz, with 2 GBytes of RAM. I have
done
all this steps - http://gnuradio.org/trac/wiki/DebianPackages - . I run
the
dial_tone.py and it sounds ok, so I suppose that GNU Radio is installed
ok.
Then I run " ./usrp_wfm_rcv_nogui.py -f 40M -O plughw:0,0" and it’s
sounds
with noise, but I think this is because of the antenna. When I try to
run
“./usrp_wfm_rcv.py -f 102.4M -O plughw:0,0” I get this:
*Traceback (most recent call last):
File “./usrp_wfm_rcv.py”, line 290, in
app = stdgui2.stdapp (wfm_rx_block, “USRP WFM RX”)
File “/usr/lib/python2.5/site-packages/gnuradio/wxgui/stdgui2.py”,
line
36, in init
wx.App.init (self, redirect=False)
File
“/usr/lib/python2.5/site-packages/wx-2.6-gtk2-unicode/wx/_core.py”,
line 7700, in init
self._BootstrapApp()
File
“/usr/lib/python2.5/site-packages/wx-2.6-gtk2-unicode/wx/_core.py”,
line 7352, in _BootstrapApp
return core.PyApp__BootstrapApp(*args, **kwargs)
SystemError: wxEntryStart failed, unable to initialize wxWidgets! (Is
DISPLAY set properly?)
Fallo de segmentación (core dumped)

*I have been reading other forums, but I don’t know how to solve it. I
know
that it’s something wxWidgets, but …
Thanks

OK Patrick I’ll take into account next time. At the end I could solve my
problems. Now I’m trying to transmit with the Basic TX
Thanks .

Brian P. wrote am 2008-07-29 17:07:

On Tue, Jul 29, 2008 at 11:01 AM, rita pfc
[email protected] wrote:

Hello,
I’ve started again from the begining. I have installed Ubuntu 7.1, not in a
virtual machine. In a Pentium IV, 3 GHz, with 2 GBytes of RAM.

Much better, we do not support VMware.

SystemError: wxEntryStart failed, unable to initialize wxWidgets! (Is
DISPLAY set properly?)
Fallo de segmentación (core dumped)

I hate to just repeat the error, but is DISPLAY set properly?

Did you use sudo? sudo sometimes has problems to get the X settings like
DISPLAY and authority right.

If you are not really know what certain commands do, quote it in your
messages. Even subtle or innocent looking things can be important for
your problem, so tell us as much and as exact as possible what you did.
Otherwise we are not able to reproduce the problem and find the missing
or wrong part.

Patrick

Engineers motto: cheap, good, fast: choose any two
Patrick S.
Student of Telematik, Techn. University Graz, Austria

I did the records ok; I put the audio-X.dat in the same folder as
fm_tx4.py,
and I try to transmit in for example 32MHz; and in other USRP board I
put
the Basic RX, trying to receive in 160 MHz (32, 96 and 160 Mhz) but I
don’t
receive anything. Maybe I choose wrongs frequencies to transmit (and
receive) because of the noise or because of out of band of FM ( 87 - 108
MHZ)
Thank you,

rita pfc wrote am 2008-07-30 19:30:

OK Patrick I’ll take into account next time. At the end I could solve my
problems. Now I’m trying to transmit with the Basic TX

Good to hear it’s working!

What was wrong, just for the records?

Patrick

Engineers motto: cheap, good, fast: choose any two
Patrick S.
Student of Telematik, Techn. University Graz, Austria

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs