Unfortunately tunnel.py in the ofdm folder doesn't work for me either. Since you had benchmark_ofdm_* running, I would use the same settings for tunnel. I don't even have benchmark_ofdm_* going at any setting. I'm trying to get a hold of a spectrum analyzer. Hopefully it would help to clear things up.
A quick question: what bit rate did you use for your benchmark_tx/rx? The default bit rate is 100kbps, which would get bumped up to 125kbps. Tuan On Thu, Jul 8, 2010 at 2:17 PM, chuck lorres <chucklor...@hotmail.com>wrote: > > Thanks for your reply. > Well I am trying to run the tunnel.py in ofdm folder. However there is no > bit rate option in it. > If you have been able to successfully run it, please send me the parameters > that you changed? > I have tried all day to run it but to no avail. > Not even a single packet is being sensed. > In digital folders tunnel.py is running perfectly. > Thanks. > > ------------------------------ > Date: Thu, 8 Jul 2010 13:07:04 -0400 > > Subject: Re: [Discuss-gnuradio] Re: Help required tunnel.py > From: ta.tu...@gmail.com > To: chucklor...@hotmail.com; discuss-gnuradio@gnu.org > > I finally found a setting that actually works. So the real problem I think > lies in the bit rate. I had no communication whatsoever in low bit rate > (~250k). I started to have unreliable comm. at 500k and at 1Mbps I got no > packet drops for tunnel.py. However, even at 1Mbps I still got about 5% > drops using benchmark_* (always at the end). > > My theory is that lower bit rate corresponds to lower signal bandwidth. I > think in some mixer/filter stage the frequency offset is too large thus push > all of my useful bandwidth out of the passing band. With higher bandwidth, a > large path of the useful bandwidth remains in spite of the frequency offset, > thus the receiver was able to pick up some thing. Lower bandwidth works fine > for Chuck so he might not have the frequency offset problem. > > Let me know if anyone has a better explanation. > > Tuan > > On Thu, Jul 8, 2010 at 11:12 AM, chuck lorres <chucklor...@hotmail.com>wrote: > > > *-How far apart are your boards?* > 1meter apart > > *- What options did you use to run tunnel, benchmark_ofdm_*, benchmark_*.* > default with 2.41G frequency. > > *- When you run benchmark_*, did you get a lot of packet drops at the end > of transmission (about 15%)?* > perfect reception was observed. 0 packets were dropped. > > > > > ------------------------------ > Date: Thu, 8 Jul 2010 11:09:30 -0400 > > Subject: Re: [Discuss-gnuradio] Re: Help required tunnel.py > From: ta.tu...@gmail.com > To: chucklor...@hotmail.com; discuss-gnuradio@gnu.org > > > That's pretty much the same settings that I have. Can you clarify a bit > more: > > - How far apart are your boards? > > - What options did you use to run tunnel, benchmark_ofdm_*, benchmark_*. > > - When you run benchmark_*, did you get a lot of packet drops at the end of > transmission (about 15%)? > > Thanks a lot, > > Tuan > > On Thu, Jul 8, 2010 at 10:55 AM, chuck lorres <chucklor...@hotmail.com>wrote: > > I am using RFX 2400, gnuradio 3.2.2, ubuntu 9.10 and 9.04 on another > > > ------------------------------ > Date: Thu, 8 Jul 2010 10:48:24 -0400 > Subject: Re: [Discuss-gnuradio] Re: Help required tunnel.py > From: ta.tu...@gmail.com > To: chucklor...@hotmail.com > CC: discuss-gnuradio@gnu.org > > > Chuck, > > What hardware are you using? > > On Thu, Jul 8, 2010 at 10:38 AM, chuck lorres <chucklor...@hotmail.com>wrote: > > Hi, > I have successfully run digital folders tunnel.py. > However, I am not receiving anything when i run the ofdm folder tunnel.py. > Whereas the benchmark_ofdm_tx+rx.py is running perfectly. > I have varied almost all the available parameters but to no avail. > Please help me out. > Thanks in advance. > Chuck. > > > ------------------------------ > Hotmail: Free, trusted and rich email service. Get it > now.<https://signup.live.com/signup.aspx?id=60969> > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > ------------------------------ > Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. Sign up > now. <https://signup.live.com/signup.aspx?id=60969> > > > > ------------------------------ > Hotmail: Free, trusted and rich email service. Get it > now.<https://signup.live.com/signup.aspx?id=60969> > > > > ------------------------------ > Hotmail: Trusted email with Microsoft’s powerful SPAM protection. Sign up > now. <https://signup.live.com/signup.aspx?id=60969> > ------------------------------ > Hotmail: Trusted email with powerful SPAM protection. Sign up > now.<https://signup.live.com/signup.aspx?id=60969> > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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