RE: [Discuss-gnuradio] Can't transmit from USRP2

[Matigakis Emmanouil]

Hi Kjellsson,

we had the same problem a while ago and we still haven't been able to fix it.
It seems that USRP2 receives but doesn't amplify the signal so it is very weak
compared to the noise. We also can't transmit from the USRP2 at all just like
you. Have you been able to do something yet?

Manolis.


-----Original Message-----
From: address@hidden on behalf of Mattias Kjellsson
Sent: Fri 11/14/2008 5:14 PM
To: address@hidden
Subject: Re: [Discuss-gnuradio] Can't transmit from USRP2

Today I updated gnuradio to current svn9988. And while doing that I also
downloaded the binary package of mb-gcc and built the firmware- files,
successfully thanks to the wiki and a well known search- engine.

The new firmware was loaded onto the sd- card successfully(?) is there
supposed to be some output from u2_flash_tool, I can't locate the source
for it, so I can't check for myself. But since I could run find_usrps
with the (probably) new firmware, I guess it went fine.

I then tried all the test- programs, and they ran fine (find_usrps,
tx_sample, ... from usrp2/host/apps/), before lunch, but when I got back
from lunch they didn't.

I simply can't transmit according to my hardware oscilloscope. Although
I see packages flowing on my eth0- device (using wireshark).

And when I try rx_streaming_samples (with a signal- generator as source,
generating a 100kHz sine) I suddenly receive a lot of noise. Looking at
the fft of the received signal one could say that it _might_ be a
sinusoid in there, but very weak. But only after lunch, before lunch the
received signal was a noise free sinus of 100kHz...

The only thing that is working as expected after I got back is
find_usrps. I think I'll never eat lunch again ;)

I'm out of ideas of how to solve this. Suggestions of things to try
and/or check for, no matter how simple would be appreciated.

BR
//Mattias Kjellsson




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