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Today's Topics:
1. N210 w/ SBX - LO unlocked (Tom Theisen)
2. Re: N210 w/ SBX - LO unlocked (Tom Theisen)
3. Spurs on a two signal test (Jeff Scaparra)
4. Re: N210 w/ SBX - LO unlocked (Tom Theisen)
5. OFDM Implementation Error (ZaInzAiN Jj)
----------------------------------------------------------------------
Message: 1
Date: Sun, 17 Mar 2013 05:13:02 +0100
From: Tom Theisen <[email protected]>
To: [email protected]
Subject: [USRP-users] N210 w/ SBX - LO unlocked
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Hey everyone,
I have problems receiving with the USRP N210 and the SBX daughterboard.
Everything was working fine, then the USRP sat on a shelf for about one
month and now i can't receive anything. Transmitting is fine though.
I noticed it while i was running OpenBTS, i can see the network on the
phone but i cannot connect and the logs show no sign of reception. I
then tried to use rx_samples_to_file from the UHD examples, which is
showing following error:
Checking RX: LO: unlocked ...
Error: AssertionError: lo_locked.to_bool()
in int _main(int, char**)
at /home/muling/gnuradio/uhd/host/examples/rx_samples_to_file.cpp:189
I then tried all the uhd_cal* tools, all throwing following error:
Error: timed out waiting for TX and/or RX LO to lock
Also, i tried to increase the timeout for the uhd_cal tools with
changing the timeout from 50 to 5000 ms:
//wait for the LOs to become locked
boost::this_thread::sleep(boost::posix_time::milliseconds(5000));
That didn't work either. (I recompiled it of course.)
I also tried:
- Connecting the USRP directly to the computer's NIC (without Gbit/s
switch). -> no change
- Disassembling the USRP and reseating the daughterboard -> no change
- Trying on another computer (which also had the software installed and
always worked) -> no change
- Compiling the newest sources with build-gnuradio script -> no change
- Writing new firmware & fpga image with usrp_n2xx_net_burner.py -> no
change
- executing uhd_fft -> "noise" is shown, but nothing more (I sweeped
over known GSM frequencies which worked previously) -> no change
- Checking the powersupply -> Shows no irregularities on the scope,
voltage perfectly fine.
The last thing i did when it was working was executing kal -s GSM900,
which worked fine. I didn't touch it for a month, and now this :/. I
have never connected anything else than an antenna to it and no strong
radio sources were nearby. Also i noticed that the daughterboard gets
quite hot. I measured it with an IR thermometer and it showed around 50
Degrees Celsius for the whole board. (I didn't want to touch it because
of ESD)
So is anybody able to help me out here? That would be tremendously
amazing! I hope it's not a hardware problem..
I attached the output of rx_samples_to_file, uhd_cal_tx_dc_offset and
uhd_usrp_probe for you. Maybe it can tell you someting i didn't notice.
- Tom Theisen
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Message: 2
Date: Sun, 17 Mar 2013 07:39:20 +0100
From: Tom Theisen <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] N210 w/ SBX - LO unlocked
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
Hey,
On 2013-03-17 07:27, zhe yang wrote:
> Did you see the output frequency on SA? Did it match what you set?
By SA do you mean a spectrum analyzer?
If so i don't have that hardware unfortunately but i was able to see an
OpenBTS network on my phone and i was able to switch some 433 MHz sockets.
I can have a look at the output with an rtl-sdr stick if that helps. Thx
for your input :)
- Tom Theisen
------------------------------
Message: 3
Date: Sun, 17 Mar 2013 02:46:31 -0400
From: Jeff Scaparra <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] Spurs on a two signal test
Message-ID:
<CALWgEa02dMnepbsy0o9ocz=s7uzjvdcwdfy1lwzubuscx05...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
I may very well be doing something wrong but I have been testing the USRP
via a loopback with 40 db of attenuation. With the attached grc I am
getting spurs that are only 5 db down from the source signals. Is this
normal. Should I be doing something I am not?
Thanks,
Jeff
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Message: 4
Date: Sun, 17 Mar 2013 08:21:48 +0100
From: Tom Theisen <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] N210 w/ SBX - LO unlocked
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
Hey,
On 2013-03-17 08:07, zhe yang wrote:
> You mean you phone can recognize the 433MHz from USRP? That's
> interesting......
No, the phone can see the 900MHz GSM carrier made by the OpenBTS
software. I have 433MHz remote control "outlets" which you can switch by
sending some data to them. That worked also.
>
> What is rtl-sdr stick?
The rtl-sdr project ( http://sdr.osmocom.org/trac/wiki/rtl-sdr) makes it
possible to use a cheap DVB-T television receiver with a certain chip as
software radio receiver. Its clock drifts a lot but it is enough to see
the output of the USRP.
I just tried to send a carrier at 433,9 MHz and it is nicely received by
the rtl-sdr. So i guess my transmitting section is working fine.
>
> FYI, if you have more than one USRP, I think you can play the trick
> that use one of them as receiver, but just show the FFT of the
> received signal, it can roughly gave some carrier frequency information.
I have done that with the rtl-sdr now. It shows a really nice carrier :)
Only the receiving part does not work apparently..
- Tom Theisen
------------------------------
Message: 5
Date: Sun, 17 Mar 2013 18:25:16 +0800 (SGT)
From: ZaInzAiN Jj <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] OFDM Implementation Error
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
I use latest gnuradio 3.6.4, USRP N210, Ubuntu 12.04
I try,
root@pasca:/usr/local/src/gnuradio-3.6.4/gr-digital/examples/ofdm#
./benchmark_tx.py
but there are error as below
Traceback (most recent call last):
? File "./benchmark_tx.py", line 29, in <module>
??? from gnuradio import digital
ImportError: cannot import name digital
What is the trouble?
Thanks,
Zai
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