[Discuss-gnuradio] Sometimes USRP sensitiviy goes down

2011-03-15 Thread Songsong Gee
Now I've tried communication test a lot of times. I send a signal like below: https://picasaweb.google.com/lh/photo/Ntw86qudmxB4Qu07Z1TNvQ?feat=directlink Then RX shows plot like below: https://picasaweb.google.com/lh/photo/H9RItzjpfemHy-OR2eQhQg?feat=directlink Most of time it's fine. However,

[Discuss-gnuradio] wiener based SSB demodulator

2011-03-15 Thread Sim IJskes
Hello, i've build a wiener based SSB demodulator, and i was wondering, does the amplitude of the sine and cosine oscilators influence the general signals behaviour? Gr. Sim ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu

Re: [Discuss-gnuradio] try to install minimal gnu-radio

2011-03-15 Thread Tom Rondeau
On Tue, Mar 15, 2011 at 12:59 AM, wrote: > if i did > GRC_GRUEL dnl must come first > GRC_GCELL > GRC_GNURADIO_CORE > GRC_USRP > GRC_USRP2 > dnl GRC_GR_USRP dnl this must come after GRC_USRP > dnl GRC_GR_USRP2 > dnl GRC_GR_GCELLdnl thi

[Discuss-gnuradio] REF clock for USRP2

2011-03-15 Thread Feng Andrew Ge
Would experienced users please recommend me a 10MHz REF clock for stabilizing USRP2? I followed previous emails and found that "any 10 MHz reference (square or sine wave, DC-blocked and terminated in 50 ohms, 3V pk-pk) with will suffice, it does not need to be a pulse per second source." As

Re: [Discuss-gnuradio] REF clock for USRP2

2011-03-15 Thread Marcus D. Leech
On 03/15/2011 11:54 AM, Feng Andrew Ge wrote: > > Would experienced users please recommend me a 10MHz REF clock for > stabilizing USRP2? I followed previous emails and found that "any 10 > MHz reference (square or sine wave, DC-blocked and terminated in 50 > ohms, 3V pk-pk) with will suffice, it

[Discuss-gnuradio] tunnel.py printing string of "B"s

2011-03-15 Thread William Cox
I'm trying to run tunnel.py on my Atom PC with a USRP 1 hooked up. I'm attemping to run it with a Fc of 4 Mhz and the standard values (Basic RX and LF Tx daughterboards). The terminal window is filling up with the "B character and I can't determine a) why that's happening and b) where it's coming f

Re: [Discuss-gnuradio] tunnel.py printing string of "B"s

2011-03-15 Thread Tom Rondeau
On Tue, Mar 15, 2011 at 3:03 PM, William Cox wrote: > I'm trying to run tunnel.py on my Atom PC with a USRP 1 hooked up. I'm > attemping to run it with a Fc of 4 Mhz and the standard values (Basic RX and > LF Tx daughterboards). > The terminal window is filling up with the "B character and I can'

[Discuss-gnuradio] Computing Power Spectra

2011-03-15 Thread Scott Johnston
Hello, I wrote a simple grc graph to compute power spectra of the output of the usrp. My test setup is a signal generator outputting a tone at the same frequency that I set as the usrp center frequency, directly connected to the usrp. But when I examine the output in Matlab, the first vector i

Re: [Discuss-gnuradio] Computing Power Spectra

2011-03-15 Thread Nick Foster
On Tue, 2011-03-15 at 17:48 -0400, Scott Johnston wrote: > Hello, > > I wrote a simple grc graph to compute power spectra of the output of the > usrp. My test setup is a signal generator outputting a tone at the same > frequency that I set as the usrp center frequency, directly connected to > t

[Discuss-gnuradio] lowest power of the signal that LFRX can receive

2011-03-15 Thread Yan Nie
Dear all, What is the lowest power of the signal that LFRX can receive? Really appreciate any of your help Yan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

Re: [Discuss-gnuradio] Computing Power Spectra

2011-03-15 Thread John Orlando
On Tue, Mar 15, 2011 at 4:48 PM, Scott Johnston wrote: > Hello, > > I wrote a simple grc graph to compute power spectra of the output of the > usrp. My test setup is a signal generator outputting a tone at the same > frequency that I set as the usrp center frequency, directly connected to the > us

Re: [Discuss-gnuradio] lowest power of the signal that LFRX can receive

2011-03-15 Thread Marcus D. Leech
Dear all, What is the lowest power of the signal that LFRX can receive? Really appreciate any of your help Yan The LFRX has almost no gain, so you're limited by the noise floor of the ADC. In the USRP2, you can probably reliably detect signals down to about -60dBm or so. In the USRP1, you

Re: [Discuss-gnuradio] lowest power of the signal that LFRX can receive

2011-03-15 Thread Alexandru Csete
On Wed, Mar 16, 2011 at 1:07 AM, Marcus D. Leech wrote: >> Dear all, >> >> What is the lowest power of the signal that LFRX can receive? >> >> Really appreciate any of your help >> >> Yan >> > The LFRX has almost no gain, so you're limited by the noise floor of the > ADC.  In the USRP2, you can pr

[Discuss-gnuradio] Can static cause USRP work inproperly?

2011-03-15 Thread Songsong Gee
At least, until the day before yesterday, my flow graph works fine with USRP TX: https://picasaweb.google.com/lh/photo/FVqGp6Qt39P3nP-DLzm2pg?feat=directlink RX: https://picasaweb.google.com/lh/photo/rKCvVTq9Ptst_u2Z0TvCDw?feat=directlink Suddenly, however, yesterday received signal strength is m

Re: [Discuss-gnuradio] lowest power of the signal that LFRX can receive

2011-03-15 Thread Yan Nie
On 03/15/11, Alexandru Csete wrote: > > On Wed, Mar 16, 2011 at 1:07 AM, Marcus D. Leech wrote: > >> Dear all, > >> > >> What is the lowest power of the signal that LFRX can receive? > >> > >> Really appreciate any of your help > >> > >> Yan > >> > > The LFRX has almost no gain, so you're limit