Re: [Discuss-gnuradio] USRP2 / Tunnel.py packet reflection issue

, David Barton wrote:   I have been troubleshooting an issue with possible packet relflections and cannot figure out the cause. I am running tunnel.py on two USRP2s that are cabled together with a 20dB attenuator between them. The settings I am using on both sides for tunnel.py are: Tx Gain: 15

[Discuss-gnuradio] (no subject)

/10/2011 10:25 AM, David Barton wrote: I have been troubleshooting an issue with possible packet relflections and cannot figure out the cause. I am running tunnel.py on two USRP2s that are cabled together with a 20dB attenuator between them. The settings I am using on both sides for tunnel.py

[Discuss-gnuradio] USRP2 / Tunnel.py packet reflection issue

  I have been troubleshooting an issue with possible packet relflections and cannot figure out the cause. I am running tunnel.py on two USRP2s that are cabled together with a 20dB attenuator between them. The settings I am using on both sides for tunnel.py are:   Tx Gain: 15 dB Rx Gain: 10 dB

Re: [Discuss-gnuradio] Tunnel.py exception

I have been running it for a few days and have no issues now. The tunnel seems to continue working for days. Thanks for your help! Dave From: Feng Andrew Ge gefengflo...@gmail.com To: David Barton david.barto...@yahoo.com Cc: discuss-gnuradio@gnu.org Sent

Re: [Discuss-gnuradio] Tunnel.py exception

  From: Thomas Hauer t...@thomashauer.at To: William Cox wc...@ncsu.edu; David Barton david.barto...@yahoo.com Cc: discuss-gnuradio@gnu.org Sent: Wed, April 27, 2011 8:39:26 AM Subject: AW: [Discuss-gnuradio] Tunnel.py exception Hello William, Hello David,   i had this problem too. I changed my

Re: [Discuss-gnuradio] Tunnel.py exception

, Dave   From: Feng Andrew Ge gefengflo...@gmail.com To: discuss-gnuradio@gnu.org; David Barton david.barto...@yahoo.com Sent: Fri, April 29, 2011 10:35:52 AM Subject: Re: [Discuss-gnuradio] Tunnel.py exception Dave, In the patch I told you, please change  4096

Re: [Discuss-gnuradio] Tunnel.py exception

Ok. Would the case I described also cause the same shape exception killing the receive chain. Because anytime it fails on me it always is with 4095 which I cant figure out why. Thanks, Dave From: Feng Andrew Ge gefengflo...@gmail.com To: David Barton

Re: [Discuss-gnuradio] Tunnel.py exception

Andrew, I tried making the change you suggested but it results in NameError: global name 'string_len' is not defined. Any idea? Thanks, Dave Message: 11 Date: Thu, 21 Apr 2011 16:26:56 -0400 From: Feng Andrew Ge gefengflo...@gmail.com To: discuss-gnuradio@gnu.org Subject: Re:

Re: [Discuss-gnuradio] Tunnel.py exception

for 1 Mbps. Unfortunatly this makes it unusable for longer duration lower bandwidth tests until I find a way to fix the problem. Has anyone else had this problem with tunnel.py? Thanks, Dave From: Tom Rondeau trondeau1...@gmail.com To: David Barton david.barto

[Discuss-gnuradio] tunnel.py MAC address

When I run tunnel.py and configure the grX interface IP address I noticed using ifconfig that a seemingly random MAC address is assigned to the gr interface. Does ayone know if there is any logic to how the address is created? Thanks, Dave ___

[Discuss-gnuradio] Tunnel.py hanging after some time

Hi, I am having trouble with the tunnel.py in the digital foler appear to stop working after a while when using lower bitrates (around 0.5 MB/s) . When I first set up the newtork I am able to ping other nodes with no problem. After some time (sometimes less than half an hour) the pings are no

[Discuss-gnuradio] Wireshark issue

Hi, I am relatively new to GNU Radio. I set up a simple experiment of connecting a file source directly to the usrp sink and monitoring the traffic on the ethernet port using wireshark. The source file simply contains the letters abc. When I ran the flowgraph in GRC it did seem to initiate

[Discuss-gnuradio] Simple digital data transmitter

Hi,   I have set up the following simple digital data transmitter:     File source -à   throttle    -à    packet encoder ---   DBPSK modulator -à USRP2      File size sample rate   samples/sym - 2    samples/sym – 2   Inter rate 32   -variable 3.125M  

Re: [Discuss-gnuradio] Simple digital data transmitter

Thanks Eric. So the packet encoder samples /symbol does not affect the bit rate but just needs to match the dpsk samples/ symbol rate? Dave From: Eric Blossom e...@comsec.com To: David Barton david.barto...@yahoo.com Cc: discuss-gnuradio@gnu.org Sent: Wed

Re: [Discuss-gnuradio] DPSK Modulator and Demodulator

  From: Jason Uher jasonu...@gmail.com To: discuss-gnuradio@gnu.org; david.barto...@yahoo.com Sent: Thu, April 22, 2010 7:51:41 AM Subject: Re: [Discuss-gnuradio] DPSK Modulator and Demodulator Thanks Jason. I have not delved into the code of the dbpsk

[Discuss-gnuradio] USRP2 FPGA documentation

Hi, Is there any documentation or source code available for signal processing done in the USRP2 FPGA? I have seen lots of block diagrams, etc. for USRP but been unable to find anythign similar for usrp 1. Thanks, Dave ___ Discuss-gnuradio

[Discuss-gnuradio] DPSK Modulator and Demodulator

Hi, I am having trouble the the DBPSK mod and demod blocks. My flow graph is: file source - DBPSKmod - DBPSKdemod - file sink The file source is a 2 byte text file set to not repeat The default parameters were used for the DBPSKmod and demod blocks (including 2 Samples/Symbol) When I run the

[Discuss-gnuradio] FFT block's use of sampling rate

Hi, In GRC I hooked up a signal source with a 100kHz sampling rate directly to a FFT sink. I accidentally listed the FFT sampling frequency as 200kHz. I noticed that it did not complain and all it did was shift the actual signal source frequency by a factor of 2. So my guess would be that the

[Discuss-gnuradio] Low Pass filter and DPSK params

Hi, I have questions about the parameters in the DBPSK and Low Pass Filter blocks in GRC. Low Pass Filter block: 1) If I set the lowpass filter block to interpolate by a factor of 10 should the sampling rate parameter by set to the input sampling rate or the output sampling rate since they