Re: Audio sink to "wire"

Hi Jakub and Marcus: On the Mac, use the BlackHole virtual audio driver. It’s at https://github.com/ExistentialAudio/BlackHole. You can create a virtual audio device and point WSJT-X at it for input, output, or both. It works well and the developer is responsive to questions and suggestions.

Re: Strategies to save/display low sample-rate data

Aha! THANKS! Kevin > On Apr 10, 2024, at 11:45 AM, Daniel Estévez wrote: > > Hi Kevin, > > milli-Hz, not Mega-Hz. 0.078125 Hz = 78.125 mHz. > > On 10/04/2024 20:43, Kevin McQuiggin wrote: >> Hi Daniel: >> I’m confused re the math here, or maybe the concept

Re: Strategies to save/display low sample-rate data

Hi Daniel: I’m confused re the math here, or maybe the concept! Please forgive what may be a dumb question. Where does 78 MHz for frequency resolution come from? 80 SPS using analytic sampling (IQ) means a bandwidth of 80 Hz. 1024 bins in the FFT with an 80 Hz bandwidth gives 80/1024 or 0.0

Re: Using RFNoC blocks for satellite systems

No it doesn’t! Sent from my iPhone > On Jan 26, 2024, at 14:22, Marcus D. Leech wrote: > > On 26/01/2024 17:07, Daniel Estévez wrote: >> Hi Yotam, >> >> As far as I know, the B200 doesn't support RFNOC. From >> >> https://www.ettus.com/sdr-software/rfnoc/ >> >> "all USRP devices from the th

Re: Total SDR Newbie

Hi Arnie: Welcome! Marcus gave good advice. SDRs still rely on the physical world to transmit and decode signals. This means that there will always be issues with things like noise, interference, and propagation problems: the same things that affect analog radio. Amateur radio experience (o

Re: Stop making unneeded improvements

Hi Paul: FYI, I was in largely the same position re DSP and SDR several years ago, that is, of a newbie with strong computing science and math background, and fairly good radio systems knowledge, but with dust on the mathematics side for a couple of decades. I found a fantastic introductory te

Re: Interested in Cognitive radios

Hi Shreeram: There was an interesting talk on AI and “cognitive radio” at the last GRCON in Huntsville, Alabama in September 2019. Here’s the title and link: "Man or Machine?: Developing a "Turing Test" for Radio Intelligence” https://www.youtube.com/watch?v=kJ27aec_dZs&list=PLbBQHMnVMR41tOomyB

Gnuradio Interface to a Tuning Knob?

Hi All: I recall that at one time there was a gnuradio block that interfaced to some sort of physical tuning knob. I am wondering if anyone remembers this and has some details? My recollection was that the device was from the gaming world, but that it was never that popular so support for it

Re: gr_modtool Won't Run (3.8.1.0; MacPorts)

Hi Tony: No go. Same message. Thanks anyway! Kevin > On Jul 28, 2020, at 11:07 AM, Kevin McQuiggin wrote: > > Thanks Tony I will try this and let you know! > > Kevin > > >> On Jul 28, 2020, at 11:05 AM, Tony Tyrwhitt-Drake >> wrote: >> >>

Re: gr_modtool Won't Run (3.8.1.0; MacPorts)

Thanks Tony I will try this and let you know! Kevin > On Jul 28, 2020, at 11:05 AM, Tony Tyrwhitt-Drake > wrote: > > I had this problem too. Gr-modtool uses the ‘click’ package - and it seems > that the mac ports install of 3.8.1 does not install this dependency. I > solved the problem by i

gr_modtool Won't Run (3.8.1.0; MacPorts)

Hi All: I am debugging a C++ block and need to clone a block for experimentation. gr_modtool fails on my 10.15.5 MacOS laptop as follows: mcquiggi@Kevins-MacBook-Pro ~ % gr_modtool Traceback (most recent call last): File "/opt/local/bin/gr_modtool", line 25, in from gnuradio.modtool.cli.b

Re: Boundary alignment (follow up)

; Lannan > > > >> On Jul 24, 2020, at 10:57 PM, Kevin McQuiggin > <mailto:mcqui...@me.com>> wrote: >> >> Hi Lannan: >> >> I am at about the same stage as you are with packetization and am >> researching quite similar requirements. I

Re: Boundary alignment (follow up)

Hi Lannan: I am at about the same stage as you are with packetization and am researching quite similar requirements. I spent the last few days reading and experimenting with some success. There are several blocks that can help you add length tags and headers to your data stream. Look at the

Re: Byte Boundary alignment

Hi Lannan: I am working on a similar project in the digital not audio domain. There are two approaches. The simple one, which I am currently using, is to prepend each message with a preamble of known bytes. Then you recover byte alignment from the received bitstream by using a sliding window

Re: Question regarding transmission of a tone using QPSK

Hi Lannan: I am in exactly the same place as you are in regard to learning about digital modulation and packet transmission in gnuradio. I am working towards development (and understanding) of a digital transmission and reception system. My goal is simply to learn how this is done in gnuradio

Re: FM Transmission with a vector of bits

> > > > Le jeu. 2 juil. 2020 à 18:21, Alex Humberstone <mailto:alex.m.humberst...@gmail.com>> a écrit : > Hey Kevin, I don't see the link that you mentioned, did you forget to include > it? > > > On Thu, 2 Jul 2020 at 11:18, Kevin McQuiggin <mailto:mcqui...@

Re: FM Transmission with a vector of bits

Hi Anthony: Check out this link. The author is using a Pluto but he developed a flowgraph to transmit a vector that represents Morse code. Pretty well-explained. The ideas you need are likely in there. Kevin > On Jul 2, 2020, at 8:40 AM, Anthony B. wrote: > > Hello all, > > I am trying

Re: [Discuss-gnuradio] Data loss during transmission (OFDM .bmp file)

Read, read read! Simple questions often lead to very complex answers. You might start your studies with "The Scientist & Engineer's Guide to Digital Signal Processing” by S. Smith. Kevin > On May 5, 2019, at 9:46 AM, Marcus Müller wrote: > > Well, noise happens, and synchronization isn't ins

Re: [Discuss-gnuradio] CC1101 GFSK packet decode with variable length

Hi Alban et al: Great RTFM graphic! gnuradio’s documentation could indeed be much better: this is a discussion topic at conferences and meetings. I had the same issues a couple of years ago when I was brand new. Unfortunately, for undocumented blocks, or those ones where the docs are not c

[Discuss-gnuradio] Hotel Info for GRCon18?

Hi All: Just wondering if there are any hotel partnerships/arrangements in conjunction with GRCon18? I have my ticket but am now looking to book accommodation. Kevin signature.asc Description: Message signed with OpenPGP ___ Discuss-gnuradio mailin

Re: [Discuss-gnuradio] Underflow and Overflow

0 dB. Please tell the group more about your “transceiver": this is a broad statement, what are you trying to achieve? There are several different types of transceivers and the implementation will depend upon the application you have in mind. Kevin > > Thank you in advanced

Re: [Discuss-gnuradio] GNURadio Companion LPF

Hi Alvin: You need to widen the transition bandwidth, not reduce it! Going from 1000 to 150 Hz will greatly increase the complexity of the filter. Try 5000 Hz to see if you get better performance. Kevin Sent from my iPad > On May 21, 2018, at 20:14, Yeo Jin Kuang Alvin (IA) > wrote: > >

Re: [Discuss-gnuradio] AUTOMATIC START AND STOP FILE RECORDING

Hi Ernest: Why not just record at the three stations continuously with accurate time stamps going into the files? Then you can line up the three recordings easily using the time stamp values. When the recordings start and stop won't matter. Kevin Sent from my iPad > On Aug 24, 2016, at 10:0

Re: [Discuss-gnuradio] Discuss-gnuradio Digest, Vol 165, Issue 15

Hi Bala: Those are pretty broad questions, perhaps you can clarify them a bit. One doesn't really "extract" information from a Python program into a flowgraph. A flowgraph is just a graphical representation of a signal processing program. It sounds like you may be new to the list. Have yo

Re: [Discuss-gnuradio] [USRP-users] pulse generation

Hi Haris: Sounds like a project you are really going to learn a lot from. Take a look at the gnuradio tutorials, they will get you going on how to generate pulses as you require. Kevin From: USRP-users [mailto:usrp-users-boun...@lists.ettus.com] On Behalf Of Haris Tanveer via USRP

Re: [Discuss-gnuradio] new user

Hi Darin: Just chiming in. I use MacPorts, it works really well. There is the occasional build error if the MacPorts folks are behind gnuradio developments a bit, but generally there are no problems. I use Ubuntu for my main gnuradio machine. The RTL dongles are good and quite versatile.

Re: [Discuss-gnuradio] INMARSAT wide signal question

My error, typo I meant GMSK!! Sent from my iPad > On May 3, 2016, at 9:31 PM, Kevin McQuiggin wrote: > > Hi Henry: > > The narrowest channels are 600 bps MPSK, although in Inmarsat parlance they > call it "A-BPSK". There are 1200, 4800, 10200 bps channels as well

Re: [Discuss-gnuradio] INMARSAT wide signal question

(On a side note, I’m kind of surprised that people [you > and killmore231] can get Inmarsat with a patch. I just barely see the signals > with 9A4QAV’s helix and an SDRplay. However, Iridium comes in like a > blowtorch.) Anyway, can’t wait to see your program. Is it on Github? > &g

Re: [Discuss-gnuradio] INMARSAT wide signal question

Hi Henry: I have an Inmarsat demodulator working for the lower speed control channels. I am writing a program to decode the traffic, but this is not a trivial task. Think on the order of 1000 lines of C. It is "almost" working, I am hoping for valid output in the next week or so, depending o

[Discuss-gnuradio] Looking for Inmarsat Documentation Diagram - "Figure A2-1"

Hi All: Here’s an esoteric request: I am working on an Inmarsat decoder for 600 bps P-Channel frames. Gnuradio on the front end, and a C program for decoding the recovered data frames. I’m using an Ettus B200 for the reception and gnuradio as the demodulator. The satellite is on 1545.110 MH

Re: [Discuss-gnuradio] Antenna compatibility problem

Hi SangHyoeg: If you want a good introduction to antennas, designed for the non-professional (typically, ham radio enthusiasts), I suggest "The ARRL Antenna Book for Radio Communications”. As an engineer, you will find the material easy to read and understand. The book will give you necessary

Re: [Discuss-gnuradio] dive into gnu-radio

Hi Martijn: Two cents from me, a relative non-technical newbie, also a long-time amateur radio operator. My educational and professional background is in computing science and a bit of math. I first found gnuradio a few years ago, and had a similar experience to yours. I played around with i

Re: [Discuss-gnuradio] RDS decoding ?

. Kevin FM-RDS-v10-with-tcp.grc Description: Binary data > On Jan 10, 2016, at 11:54 AM, Kevin McQuiggin wrote: > > Hi Jean-Michel: > > Certainly! It took me a couple of months of reading, experimentation and > head-scratching to figure the DSP side of RDS reception ou

Re: [Discuss-gnuradio] RDS decoding ?

Hi Jean-Michel: Certainly! It took me a couple of months of reading, experimentation and head-scratching to figure the DSP side of RDS reception out. I had a bit of help from a couple of people on the [discuss-gnuradio] list as well. The GRC is at home, I will post it to the list (or a pointe

Re: [Discuss-gnuradio] power amplifiers on TX

The amateur limit is 1000 Watts. Personally I ran 800+ Watts on the 2 metre band in the late 1980s for my EME (moonbounce) station. All analog, single long-boom Yagi. I used a 2M downconverter and listened on my 10M receiver as it was way more sensitive than my 2M rig. Over about a year's opera

Re: [Discuss-gnuradio] ham/amateur getting started

Thanks for the interesting comments. > And that's why it's so exciting to have amateur operators to talk to -- I > don't come from a ham background myself, and so I'm learning new stuff every > day. It's often the practical things that stop you if you're a "theory and > lab person”. My friend

Re: [Discuss-gnuradio] ham/amateur getting started

Amateur radio has also historically been a source of innovation and new technologies. This has been fairly constant throughout the 100+ years of amateur activity. In many cases, while a specific new technology may not have arisen directly from amateur radio activity, the innovative spirit that

Re: [Discuss-gnuradio] gnuradio 3.7.9: Issue with OSX Port of gnuradio-companion

“Kevin’s Programs”) then it generates fine. I will look for where the escape needs to be added… Kevin > On Dec 25, 2015, at 1:49 PM, Kevin McQuiggin wrote: > > Hi All: > > I searched the mailing list archives for this issue with negative results. > > Issue: an unchanged

Re: [Discuss-gnuradio] New to GNURADIO - DIGITAL MODULATION

Hi mohamid92: You could try the “Guided Tutorials”, they have a section on PSK modulation that is quite good. The URL is: http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials You can also watch the excellent

[Discuss-gnuradio] Lock-Up Time for 2PSK Demodulation

Hi All: I have a .grc 2PSK demodulator working for the RDS subcarriers on FM radio signals. I note however that it takes a couple of minutes for the PSK demod hierarchical block to settle and give me consistent good data. I tried fiddling with the three timing parameters in the block but lock-

Re: [Discuss-gnuradio] Relative Newbie Question: PSK Demod Block - RDS/RDBS Data Recovery

time decoding. Kevin > On Nov 7, 2015, at 3:53 PM, Kevin McQuiggin wrote: > > Thank you Tom, I will adjust the decimation and then take a look at your > other suggestion. I’ll keep you posted as to how it goes. At least I feel > that I am on the right track now! > >

Re: [Discuss-gnuradio] Relative Newbie Question: PSK Demod Block - RDS/RDBS Data Recovery

Thank you Tom, I will adjust the decimation and then take a look at your other suggestion. I’ll keep you posted as to how it goes. At least I feel that I am on the right track now! Kevin > On Nov 7, 2015, at 11:02 AM, Tom Rondeau wrote: > > > > On Sat, Nov 7, 2015 at

Re: [Discuss-gnuradio] Function Probe and OOT Blocks

Hi David: I'm a relative newbie myself, but I can say that I had this same issue. I had a block with a static parameter that I wanted to be able to change dynamically at runtime. I looked at the block's source code, and also at a block that had a dynamically adjustable parameter. Basically,

Re: [Discuss-gnuradio] Analyze data from Time Sink

The open source utility gnuplot works really well, I'd recommend it. Kevin Sent from my iPhone > On Sep 12, 2015, at 11:03, Przemek Lewandowski wrote: > > Hello everybody > > I have a question: > > I have my simple transmitter from garage and I recorded its data to sink file. > Is there any

Re: [Discuss-gnuradio] OOT block not showing in GRC

that install prefix should be pointing to where I installed gnuradio? > > (Never can know too many ways to skin a cat-metaphorically) > > > > Logan Washbourne > Electrical Engineering Graduate Student > (Electromagnetics) > > > On Sat, Aug 8, 2015 at 5:43 P

Re: [Discuss-gnuradio] OOT block not showing in GRC

Hi Logan: I just went through the same process! My new OOT block wasn't being found. The solution is to add a [grc] segment to the config.conf file in ~/.gnuradio: I had to create the .gnuradio directory, then add the simple two-line [grc] stanza to a new config.conf file: [grc] local_blocks

Re: [Discuss-gnuradio] Solved! Repeat Block/New Repeat Block

> Kevin, > > Yes, the qtgui sinks can only accept streams coming in at the same sample > rate, and the repeat block would change that. Glad you figured it out. I > really thought that I had added that warning to the manual page, but I don't > see it in the published manual. I need to check on

[Discuss-gnuradio] Solved! Repeat Block/New Repeat Block

Hi All: My previous report of lock-up issues with both the standard Repeat block, and a new OOT block that I wrote to allow variable interpolation can be ignored. The issue that generated my report was my use of a dual-input time sink. I was feeding a base [0,1] signal into one input, and the

[Discuss-gnuradio] Newbie Question on set_interpolation and a New Variable Repeat Block

Hi All: I am sorry to bother the list with such newbie questions, but I am climbing the gnuradio and C++ learning curve. Hope you don’t mind! I am working on a new OOT block that is similar to the Repeat block, but allows for a variable interpolation rate. I followed the Guided Tutorials (tha

Re: [Discuss-gnuradio] First Post - Question - GRC Repeat Block

I should have added that I am running gnuradio version 3.7.7.1 under OSX 10.10.4. > On Jul 25, 2015, at 8:26 PM, Kevin McQuiggin wrote: > > Hi All: > > I would like to use a repeat block to stretch the duration of vectored input > dynamically. For example, (0,1,0,1,…) i

[Discuss-gnuradio] First Post - Question - GRC Repeat Block

Hi All: I would like to use a repeat block to stretch the duration of vectored input dynamically. For example, (0,1,0,1,…) input should become (0,0,0,1,1,1,0,0,0,…), the repeat count under control of a variable. In this example the Interpolation parameter would be 3. I observe that the “Inte