Re: [Discuss-gnuradio] bell 202 modulation

Bel 202 does NOT use Manchester encoding. The individual bits are NOT sent bilevel but opposite polarity. Bel 202 very much as energy at DC after demodulation which Manchester would eliminate. It does have differential encoding but that is not Manchester. 100011010. would be

Re: [Discuss-gnuradio] bell 202 modulation

Matteo: Normally I do not play the game this way but let me suggest that you do the following thing so we can get beyond this to give people the correct information. Open up Google. Type in BEL-202, hit enter. Please tell me WHOSE NAME and DSP assembler code you see on the first several

Re: [Discuss-gnuradio] cvs+svn updates / audio / config files

Eric Blossom wrote: On Fri, Mar 31, 2006 at 05:30:04PM -0800, Thomas Schmid wrote: Hi Eric, I tried the new scripts today. Updating of my old distribution with cvs up didn't work. It had some problems with the parallel to serial --snip -- Thomas Thanks for the feedback. The

Re: [Discuss-gnuradio] OFDM demodulation problem / example video

Jens: This pi/4-DQPSK. That means New-symbol * (complex conjugate (Old-symbol)) is pi/4 modulo pi/2. Are you taking this into account on both the transmitter and the receiver and it in all of the bins before your inverse fft provides the time domain signal to transmit would be my

[Discuss-gnuradio] Re: [softrock40] SDR program for Macintosh

Today I installed a dual PPC Mac in my SDR lab at work. GnuRadio and DttSP and WSJT are all on the agenda. I helped get Portaudio going for GnuRadio and DttSP. PortAudio is a Portable Audio API and we are hoping to use it on top of CoreAudio to make all of this go. As a DttSP and GnuRadio

Re: [Discuss-gnuradio] SDR program for Macintosh

). They don't call them wind tunnels for nothing! There are various mot too expensive mods one can make to quiet the computer. Google powermac noise to get a list. - MLD On Apr 3, 2006, at 10:17 PM, Robert McGwier wrote: Man does anything else here have one of these dual PPC machines? It sounds

Re: [Discuss-gnuradio] OFDM demodulation problem / example video

Prateek Dayal wrote: On 4/4/06, *Robert McGwier* [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: http://www.cds.caltech.edu/~yasi/publications.html http://www.cds.caltech.edu/%7Eyasi/publications.html Also for frequency offset, what really matters is not the frequency offset in Hz

Re: [Discuss-gnuradio] extra qualification errors in gcc 4.1.0

Can you say a dozen times: Bob is not a C++ programmer Bob is not a C++ programmer . . . . . Ooopsy. Basically every function I have written or had a hand in. MEA CULPA. Bob Eric Blossom wrote: On Wed, Apr 05, 2006 at 12:54:37PM -0700, Erik Tollerud wrote: I'm building on FC4 with

Re: [Discuss-gnuradio] FM demodulation of a real signal

It will not be possible to recover the signal if the real signal is at zero IF (and predetection) so we will assume that it is not at zero. The simplest possible FM detector is a zero crossing counter. That is, you output a signal that is proportional to the distance between zero crossings.

[Discuss-gnuradio] Stereo FM mo

The FM stereo simple block, wfm_rcv_pll.py, has been modified to recover the carrier using gr_pll_carriertracking. I noticed an immediate drop in the hiss here. We probably need to do some gain management but that can wait until I have the remainder of the modifications in line and the

Re: [Discuss-gnuradio] TX/RX simultaneously using one USRP board

EVERY REASON IN THE WORLD. The additional path loss from your transmiter to the next recipients receiver through a linear transponder might be all the difference in the world in FM copy that is usable and too noisy to use. All of this code could not be more timely. I thank you all. I am

Re: [Discuss-gnuradio] Problem in gnuradio-core build

Eric Blossom wrote: On Wed, Apr 12, 2006 at 08:09:54PM -0400, Robert McGwier wrote: Something was recently changed in the gnuradio-core make that causes an error: Notice the waiting for jobs. This was compiled with make, not buildit. I was having a problem with doing the build on darwin

Re: [Discuss-gnuradio] USRP+Digital Radio Mundial

Take Swiger's HF modules, tune to DRM frequency and run the audio into the DRM (Dream) code. That is a hardware/analog (sound card needed) solution. A soft connection will require more work. Bob Brett L Trotter wrote: Has anyone begun/completed work on a Digital Radio Mundial block for

Re: [Discuss-gnuradio] Re: Graphical programming with Ptolemy

John Clark wrote: Eric Blossom schrieb: On Thu, May 11, 2006 at 09:22:46AM -0700, John Clark wrote: Patrick Strasser schrieb: It seems to becoming an 'annual' event that I setup a GNURadio environment, and this year's candidate machine seems to have almost nothing of the antecedent

Re: [Discuss-gnuradio] Squelch developments

May I sound a cautionary note. Squelches that do not have a ramp are not particularly kind to your listening sensibilities if this is to be used to produce an audible signal. This means that the squelch will ideally need a setting function for the ramp. The events are the same as key

Re: [Discuss-gnuradio] Squelch developments

Frank wrote the keyer code that runs in PowerSDR and is distributed with DttSP and wrote the ramp used in it as well as the agc. It is perfect shaping. You could derive a Gaussian shape that would minimize the time bandwidth product but the bandwidth would widen. It is better to spend

Re: [Discuss-gnuradio] Thesis work on GNU Radio

Daniel: I would think we need a bit more information than this. Your request is a little too wide open. Is this is Master's thesis or a Doctoral thesis/dissertation? If the latter, does it need to be original work? What areas in EE (signal processing, computer science, etc.) do you find

Re: [Discuss-gnuradio] Which LinuxOS to use?--1.Unbuntu, Fedora, Mandrake, FreeBSD

Lamar: I installed Ubunto 5.X and GnuRadio just made and ran after I used apt (synaptic) to download any package GnuRadio could not find. With Ubunto 6.0X I had to make a modification to aclocal.m4 (and I am sure there are other ways to fix it) in gnuradio-core but otherwise, it just

Re: [Discuss-gnuradio] Re: Which LinuxOS to use?--1.Unbuntu, Fedora, Mandrake, FreeBSD

by modifying GnuRadio locally. Bob Patrick Strasser wrote: Robert McGwier wrote: I need php5. php5-dev wants version 1.4 things because Ubuntu there is some issue. I could not get aclocal to work unless I forced aclocal.m4 by hand to call automake-1.9 for example. I got all of these am

Re: [Discuss-gnuradio] Thesis work on GNU Radio

Daniel: We have a reference implementation of RDS (the digital signal carried along some FM broadcast stations). That RDS code may not be checked in because it does not have the required permissions. However, it might be interesting to take this code and do a clean room version after it has

Re: [Discuss-gnuradio] Export Controls

In the early days of the encryption is an armament issue, Phil Karn produced DES code that was widely distributed. He was harassed for having done so. I was asked to comment on all of this at the time because Phil was one of my best friends at the time (and continues to be) and I worked

Re: [Discuss-gnuradio] FIR filter 'filterN' method

I suggest a block adaptive approach. Why won't this work? Bob Johnathan Corgan wrote: Eric Blossom wrote: A bigger issue however, is that setting/adjusting the taps on the SIMD versions is fairly expensive. If your filter is always adapting, you'll probably want to reimplement it in

Re: [Discuss-gnuradio] pll refout vs carriertracking

I did that on purpose. There are myriad instances where you want the recovered carrier or tone but not have the complex input mixed to the new zero. If you want a recovery and baseband, I suggest that rather than do an if test, we make a new module that is track and mix. Bob Matt Ettus

Re: [Discuss-gnuradio] pll refout vs carriertracking

Sorry. I missed what you referred to in the early email. I misread it. I agree that refout and carriertracking should not be doing the same thing. I will look at it. Bob Matt Ettus wrote: Robert McGwier wrote: I did that on purpose. There are myriad instances where you want

[Discuss-gnuradio] Quartus License silliness (FlexLM date problem)

Apologies for the cross posting. I have the infamous Warning: FLEXlm software error: System clock has been set back Feature: quartus_lite License path: C:\altera\license.dat FLEXlm error: -88,309 For further information, refer to the FLEXlm End User Manual, available at

[Discuss-gnuradio] Date fixing

I managed to change enough files using ftweak on Windows XP to allow the Quartus Web edition to compile all of projects. That was really painful to figure out. Somehow, sometime, a bunch of my files got dated October 6, 2006 and the web license must be renewed after 150 days. It used

Re: [Discuss-gnuradio] AGC loop

Bob McGwier wrote: Eric Blossom wrote: On Tue, Sep 19, 2006 at 01:36:55PM -0400, Robert W McGwier wrote: Tom: A good agc has at least two time constants. One for attack and one for decay. Your attack is much too slow. tmp = (reference - sqrt(real(y)^2 + imag(y)^2)); rate = rate1; if

Re: [Discuss-gnuradio] AGC loop and digital mods

svn co svn://206.216.146.154/svn/repos_sdr_dttsp/trunk dttsp 'Eric Blossom' wrote: On Wed, Sep 27, 2006 at 01:44:34PM -0400, Robert W McGwier wrote: The feedforward AGC system in DttSP is more complex in that it is two track (fast and user set). I believe I already mentioned this so I

Re: [Discuss-gnuradio] What's the story on hpsdr.org

HPSDR grew up on its on from Friends of Flex Radio. It was an organic happening. It is borrowing heavily from Gnu Radio. It does have a more amateur radio centric focus. TAPR and AMSAT are both supporters but we are supporters of Gnu Radio as well. Matt, Eric, and others belong to AMSAT

[Discuss-gnuradio] [Fwd: [Moon-net] SDR-IQ receiver]

RFSpace of the SDR-14 sent the following email to Moon-Net: from Pieter Ibelings, [EMAIL PROTECTED] Guys, RFSPACE will soon release the little brother of the SDR-14 receiver. This receiver covers the frequency range of 500 Hz to 30 MHz in 1 Hz steps. It can also be used for higher

Re: [Discuss-gnuradio] PS3/Cell BE platform

Yes. For a work project my group is purchasing two Mercury 1U Cell servers. This will make ATSC and HDTV a real possibility. These Mercury servers have a high bandwidth PCI express connection for getting data in and out of the world.Another fellow and I will be porting GnuRadio to the

Re: [Discuss-gnuradio] PS3/Cell BE platform

The Nividia GPU's have fft and blas running on them. They are doing teraflops and the tools/SDK are available under NDA. They do indeed have multiply , accumulate, etc. We are going to have GnuRadio in good enough shape to take over the world when these high speed SDR engines (gaming

Re: [Discuss-gnuradio] wfm_rcv_pll.py

I looked over my analysis again. The Z transform version of the usual PLL equations leads directly to the alpha, beta calculation contained in the code which yields a critically damped phase locked loop for the required bandwidth. A PLL based demodulator was chosen to aid in the mitigation

[Discuss-gnuradio] Ubuntu Dapper to Edgy upgrade

This worked seamlessly here on all machines: http://www.debianadmin.com/upgrade-ubuntu-dapper-to-ubuntu-edgy-eft.html Bob -- AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair If you board the wrong train, it is no use

Re: [Discuss-gnuradio] Question about reverse-engineering a new mode

FIPS compliant security, device security, network security, access controls, and application level security are all integral parts of Public Safety Network design and operation and AVL in particular. It is just not intended to be super duper APRS. I would not spend a lot money on equipment if

[Discuss-gnuradio] Alignment bug fix

Recently a kernel alignment bug was fixed (ugly) and this repaired the polyphase synthesis engine in the main code. My PhD student, Bill Clark (Amateur Radio call KK4EWQ) at Virginia Tech, has suffered with and pointed out this problem with the synthesizer for some time. He wrote an out of tree

[Discuss-gnuradio] gr-fosphor under pybombs-2

I recently updated pybombs to latest version using the git based installation command line from the github instructions. I could not install gr-fosphor because it would not configure. The issue appears to be that the recipe is incomplete. rwmcgwi@origin1:~/gnuradio$ pybombs install gr-fosphor

Re: [Discuss-gnuradio] GNU Radio Organizational Changes to Address Growth

Best of luck to you Tom. Come visit the Hokies! Bob Virginia Tech On Mon, Mar 14, 2016 at 10:11 AM, Tom Rondeau wrote: > I've been running the GNU Radio project for over five years. In this time, > we've dramatically expanded its capabilities, prominence, and performance. >

Re: [Discuss-gnuradio] GNU Radio Organizational Changes to Address Growth

Ben: Don't forget you are a Hokie too! Good luck! Bob On Fri, Mar 18, 2016 at 6:51 PM, Ben Hilburn wrote: > Hi all - > > As I mentioned in the thread regarding the website updates, we recently > discovered that changes to the gnuradio.org DNS caused some MX record >

Re: [Discuss-gnuradio] GNU Radio Organizational Changes to Address Growth

Great stuff Jonathan. I look forward to working with you. Do you think I will still be here when I am 70? ;-) Bob On Mon, Mar 14, 2016 at 10:15 AM, Johnathan Corgan wrote: > Most of you already know me, as I’ve been in the GNU Radio community for > eleven years in

[Discuss-gnuradio] Pybombs problems resolved

Something installed python under a directory called miniconda. I have not yet tracked that down but gnuradio and pybombs now work. Apologies to Martin, et. al. for wasting their time on my silly too complex installation. Bob -- Bob McGwier Founder, Federated Wireless, Inc Founder and

Re: [Discuss-gnuradio] pybombs and mako

ally > need a Py3k version. > > Cheers, > M > > On 12/01/2016 06:57 AM, Robert McGwier wrote: > > This is ubuntu 16.04 on an Intel machine (high end). > > > > usual startup with recipe install, prefix init, etc. > > > > > > find . | grep ma

[Discuss-gnuradio] pybombs and mako

This is ubuntu 16.04 on an Intel machine (high end). usual startup with recipe install, prefix init, etc. find . | grep mako yields /usr/lib/python2.7/dist-packages/mako and much underneath it. pybombs install gnuradio yields Install tree: | \- gnuradio | +- uhd | \-

Re: [Discuss-gnuradio] Stuck at WBFM Project :

And in addition to all of the other awesome comments, let me give you some communications theory. If a signal occupies K kHz of bandwidth, you need at least 2K samples/second to capture the information in that signal. This is called the Nyquist Sampling Theorem (it can be K complex

Re: [Discuss-gnuradio] Help understanding AX.25 encoding and tagged streams

At one time rational resampling meant that the interpolation and decimation were each integers so the rate change is the ratio of two integers and thus rational. If one or more of your inputs is fractional I believe you need the arbitrary rate resampler. Bob On Aug 15, 2017 10:16 PM, "Cinaed

Re: [Discuss-gnuradio] Simulating non linearity and distortion

And one of the best talks Matt Ettus has ever given was his talk on learning about impairments using gnuradio. See if you can dig that up or maybe someone can point to it that has a better memory than mine. Bob On Aug 18, 2017 1:45 PM, "Marcus Müller" wrote: > Yes.

Re: [Discuss-gnuradio] Using Correlate Estimation with hardware

Sebastian What center frequency did you use? What RF cards are you using? Are you using coaxial cable,to connect transmit to receive or are you transmitting and receiving through an antenna? If you are using antennas please describe them. Cheers Bob Bob On Aug 26, 2017 12:12 PM, "Sebastian"

Re: [Discuss-gnuradio] OFDM channel tap questions

Orthogonality (as the O in OFDM) guarantees a fixed phase relationship for every symbol unless a pattern is introduced in an effort to reduce peak to average power ratio (which I do not believe is happening here). PAPR is bane of OFDM and much research has gone in to reduce this problem which

Re: [Discuss-gnuradio] GNU Radio Project Leadership Updates

Thank you Jonathan. I hope you have more time to enjoy your airplane and amateur radio! Welcome to all the other "old" new people taking on great roles. We appreciate it. Bob On Wed, Jan 31, 2018 at 3:24 PM, Ben Hilburn wrote: > Hi all! > > As usual, there is a lot

Re: digital communication undergraduate course

What a wonderful service for many. Thank you so much for sharing. Dr. Robert W McGwier, Ph.D. Adjunct Faculty, Virginia Tech ARDC Member of Board ARS: N4HY ARRL, AMSAT, AAVSO, TAPR, SkyHub On Sat, Jan 9, 2021, 3:52 PM jean-michel.fri...@femto-st.fr < jean-michel.fri...@femto-st.fr> wrote: >

Re: Problem with GFSK Mod and Demod example from wiki

It appears to me you have a rectangular or wideband filter and not Gaussian with a filter shape that smooths the pulses and restricts the bandwidth. If you take the FFT of the signal you have on the left over many bauds, you will see an approximate sin(x)/x appearing shape. Bob On Fri, Aug 20,

Re: Radio Astronomy Raspberry Pi image with GNU Radio 3.10.1

Great news On Friday, February 25, 2022, Glen Langston wrote: > Hello Aficionados, > > Franco Venturi has been busy cleaning up the Raspberry Pi Operating > system for use with Radio Astronomy. GnuRadio version 3.10.1.1 is > installed in the > Raspberry Pi operating system is now on the

Re: Help on

GnuRadio is so good it can even do magic. 邏 On Mon, Mar 28, 2022, 2:01 AM Lorenzo Mainardi wrote: > As last resource I tried to update the libraries and the problem is > magically solved. > Thank you everyone for the support. > > Il dom 27 mar 2022, 18:46 Lorenzo Mainardi ha > scritto: > >>

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