Re: [Discuss-gnuradio] Does any body has the source code and/or the algorithm for IMBE vocoder to decode P25 signals?

> IMBE is proprietary and the holder of the rights, DVSI, is very very > very unwilling to share. You can try to license it from them, but > experience has shown that they are not interested. According to: http://wiki.multimedia.cx/index.php?title=IMBE the IMBE codec is patented, and here's t

[Discuss-gnuradio] USRP problem

Hi: I have a problem about USRP daughterboard RFX2400. I use "tunnel.py" to test if some nodes can communicate with each other in 2.4GHz by pinging function. Say there are three nodes: N1, N2 and N3. N1 & N2 can ping with each other and N2 & N3 can receive the ping packets too. However, N1 &

Re: [Discuss-gnuradio] ADC questions

On Wed, Sep 24, 2008 at 5:51 PM, Sebastiaan Heunis <[EMAIL PROTECTED]> wrote: > Brian > > Sorry to bother. I have one more question for now. I wrote a Python > app to generate an input signal, convert it to 12-bit two's complement > and then bitshift it left by 3 and sign-extend it to get it to t

Re: [Discuss-gnuradio] ADC questions

Brian Sorry to bother. I have one more question for now. I wrote a Python app to generate an input signal, convert it to 12-bit two's complement and then bitshift it left by 3 and sign-extend it to get it to the representation used inside the FPGA. My question now is that if I feed this input s

[Discuss-gnuradio] Reducing clock feedthrough

Hi there, I'm running into clock feedthrough interference at the 5th harmonic of the USRP oscillator (1088MHz) leaking into the DBSRX board. I found Matt's advice to Eric Cottrell to change DBSRX C261 and C262 to 4700pF to filter the clock more aggressively, and while this helped a little, I st

[Discuss-gnuradio] where is AM(FM) modulation code?

Hi, I found the am_demod.py and fm_demod.py in the blks2impl folder, but I could not find the source code for AM modulation and FM modulation? Can anyone give me a hint for finding both of modulations (AM modulation and FM modulation)? Thanks very much for your help. Jiangfan

RE: [Discuss-gnuradio] USRP receiver filter response

> What gain do you have set for the receive side? Good point - I forgot to mention that I set the gain to 0 via the --gain=0 switch passed to usrp_fft.py. So I shouldn't be seeing any clipping. Also, another detail that I forgot to mention - I didn't consider the "carrier" at the center frequen

Re: [Discuss-gnuradio] USRP receiver filter response

On Wed, Sep 24, 2008 at 7:53 AM, Kell, Scott <[EMAIL PROTECTED]> wrote: > I put a 9dBm tone in at 50 kHz What gain do you have set for the receive side? For the BasicRX or LFRX, this is really the gain of the input driver to the ADC, which can vary from 0 to 20 db, and effectively changes the fu

Re: [Discuss-gnuradio] 3rd party software

George P Nychis wrote: I was thinking that the SVN structure should be something like: / /project_name /project_name/trunk /project_name/tags /project_name/branches What does everyone think about user directories? / /projects /projects/project_name /projects/project_name/trunk /projects/pr

[Discuss-gnuradio] Migration to gruel for realtime scheduling broke python bindings

Changeset 9607+9610 broke python bindins, as the enums moved out of SWIGs scope. The following patch fixes this: === modified file 'gnuradio-core/src/lib/runtime/gr_realtime.i' --- gnuradio-core/src/lib/runtime/gr_realtime.i 2006-08-03 03:51:51 + +++ gnuradio-core/src/lib/runtime/gr_realtime

RE: [Discuss-gnuradio] USRP receiver filter response

> I then saw the post on the USRP filter response by Firas [1] where he > showed that for an overall decimation rate of 64 the CIC filter response > had better than a 55 dB anti-alias rejection. [2] But I'm seeing only 42 > dB (overall response). > > Does anyone have any ideas that explain this 1

Re: [Discuss-gnuradio] Does any body has the source code and/or the algorithm for IMBE vocoder to decode P25 signals?

IMBE is proprietary and the holder of the rights, DVSI, is very very very unwilling to share. You can try to license it from them, but experience has shown that they are not interested. Kelly On Wed, Sep 24, 2008 at 5:52 AM, teka yemane <[EMAIL PROTECTED]> wrote: > Hi guys, > Does any body has t

[Discuss-gnuradio] Does any body has the source code and/or the algorithm for IMBE vocoder to decode P25 signals?

Hi guys, Does any body has the source code and/or the algorithm for IMBE vocoder to decode P25 signals? I am doing a project on P25 software radio receiver and I need the IMBE vocoder source code. Thanks, Teka Yemane ___ Discuss-gnuradio mailing

[Discuss-gnuradio] making gr-rds-new work in latest versions of Ubuntu

The gr-rds-new processing block, as it is here: http://digilander.libero.it/iz2eeq/#rds does not compile under Ubuntu 8.04. The error is: /usr/local/bin/swig -c++ -python -I/usr/include/python2.5 -I/usr/local/gnuradio/include/gnuradio/swig -I/usr/local/gnuradio/include/gnuradio -module rds -o rds.