Posts Tagged ‘Linux’

LHS Episode #090: Purple Hays

Here we are at Episode #090, just 10 away from the century mark. Things have been rolling along fairly smoothly, and except for Russ being deathly ill for the last eight days, there’s not even a lot to complain about. In this episode, we have yet another interview. This time it’s with John Hays, K7VE, of Northwest Digital Radio. These guys are producing an entirely new purpose-built radio platform called the UDR56K. This technology promises to be a great advance in the amateur radio arena as well as in the computing arena. It’s a bit of kit that’s going to find a use in almost every radio amateur’s shack. If you want to find out why, please sit down and take a listen to this episode of LHS. We promise you will not be disappointed.

73 de The LHS Guys

Show Notes #089

Introduction:

  • The 10th Annual Ohio LinuxFest will be held September 28-30, 2012, at the Greater Columbus Convention Center in downtown Columbus, Ohio.
  • Another riveting episode even though Richard has been attempting unassisted human flight. (We’re all worried about the consequences should he succeed.)
  • Our special guest tonight is Rob Hawkins from the mintCast.

Announcements:

  • If you’re a subscriber to LHS, you can access the Etherpad, download episodes without music, and you’ll soon have the option of episodes in .flac format.
  • Remember the Black Sparrow Media app for iPhones, iPads and Android devices. It’s free! With it, you can listen to all of the podcasts in the Black Sparrow Media group.
  • Please consider donating to the podcast! Click the Donate link.
  • Check out the KF8GR Linux Ham Home Page. Even though it hasn’t been updated in several years, much of the information is still relevant.
  • Richards suggests a Linux/Amateur Radio “best on the web” award. Your web site should have at least one page devoted to Linux or Linux and Ham Radio. Send your nominations to [email protected]. If accepted, the LHS hosts will provide an award graphic for your website, and a link to your site from LHS.
  • Richard also found this TechNewsWorld article “Why Ham Radio Is Still Handy”.

Topics:

  • Interview with Rob Hawkins of the mintCast podcast.
  • Rob describes his move from Ontario, Canada to Houston, TX, and drops this bombshell: “Texas is nothing like Ontario!” Rob is an engineer by training. His first computer encounter was an IBM 370 mainframe and Fortran at the University of Waterloo, Ontario. His first personal computer was a Radio Shack Color Computer and his first Linux exposure was with Slackware and several dozen floppy disks. He’s been using Linux Mint since version 8.
  • Rob goes on to describe how he came to the mintCast.
  • Our hosts and Rob then move on to various technology topics:
    • The current state of Linux Mint.
    • UEFI – Unified Extensible Firmware Interface.
    • Software patents.
    • Windows 8 and possible opportunities for Linux.

Contact Info:

Music:

  • “The Napalm Theory” by Ophyra, from the album Post Mortem, courtesy of Jamendo.
  • “Velvet Embracer” by Diablo Swing Orchestra, from the album The Butcher’s Ballroom, courtesy of Jamendo.

Show Notes #087

Introduction:

  • Promo: Ohio LinuxFest 2012 will be held September 28-30, 2012, at the Greater Columbus Convention Center in downtown Columbus, Ohio.
  • LHS community sends their good wishes to the victims and their families in Aurora, CO.
  • Our hosts recommend Etherpad for collaborative document editing.

Announcements:

  • Ham Holiday Oklahoma City, Oklahoma, July 27-28, 2012, Biltmore Hotel.
  • Texas Linux Fest, San Antonio, Texas, August 3-4, 2012, Norris Conference Center.
  • Texoma Hamarama Ardmore, Oklahoma, October 26-27, 2012, Exit 33 – I-35: Ardmore Convention Center.
  • Watch the Events Schedule on the LHS website for more events!
  • Click the Amabassadors link on the website and volunteer to be an LHS Amabassador at a Linux or ham-related event.
  • 20th annual Gainesville Hamfest Gainesville, Texas, Saturday, August 25, 2012, Civic Center.
  • Joplin Hamfest, Joplin, Missouri, August 24-25, 2012, Holiday Inn Convention Center. Look for Russ and Cheryl!
  • Russ is anxiously waiting for delivery of two (okay, three) Raspberry Pi computers. Call the LHS voice line 909-547-7469, or send an email to [email protected], and tell Russ what to do with his Rasperry Pis. Wait, that doesn’t sound quite right, but you get the drift.

Feedback:

  • Bruce, VE2GZI, writes to express his appreciation for the episode about GNU-Radio (Episode 84). It inspired him to try getting it to work under Linux Mint 11, but it’s been a struggle, and he asks for help. Russ managed to compile it on Linux Mint Debian Edition. Jlindsay in the chat room said he ignored the build script, and just did a cmake and make. Also make sure you have the proper version of portaudio installed. Bruce also tells us he’s waiting for his Hong Kong Dongle. ’nuff said.
  • Scott, N9LJX, says he’s always had trouble with rig control, via Hamlib, and his FT-900, and wonders if that’s been improved. He’s happy to hear that yfktest works with Winkey USB. Russ looked at the Hamlib website about Yaesu radios, and saw the status listed as “.1 untested”, which indicates poor, if any, support for that radio. Richard suggests avoiding the USB or USB-to-serial adapter. Instead, buy an inexpensive serial port card for the computer and connect the radio to a real serial port.
  • Someone in the chat room asked about a good personal cloud storage solution. Russ likes ownCloud. and has described it in episode 9 of his QSK Netcast.
  • Jeremy, KB7QOA, sends a long email thanking us for the show, discussing his gradual move toward Linux, and wonders if he could have a version of the podcast without the music. Well, Jeremy, if you’re willing to subscribe to the show, you’ll soon have the option of a music-free feed.
  • Grant, AA9LC, has embarked on a project to establish a Linux computer in his hamshack. He met Russ at the recent Dayton Hamvention, and has been trying to boot the LHS disc he received there, but it wants a username and password. He’s also tried Linux Mint 11 and is “mostly impressed.” As the disc contains nothing more than Linux Mint Debian Edition, Russ suggests the username may be one of “root”, “mint”, or “linuxmint”, and no password. However, it should boot directly into a “live” mode desktop without ever asking for a username or password. If that doesn’t help, Grant, let us know and provide a few more details about when you’re asked for the username and password. Russ and Richard also provide some hints about managing sound card audio.
  • Look for Russ on Episode 124 of the Mintcast.

Contact Info:

Music:

LHS Episode #087: King Jeremy the Wicked

Hello, listeners! Welcome to the 87th installment of Linux in the Ham Shack. The past couple of episodes have been full of interviews, logic, and information. In short, we’ve totally jumped off our normal bandwagon. In order to fix that, we’ve put together an episode that contains a lot of banter, insight, musing, laughing, music and good times. Somewhere in the middle you’ll find information on Linux, Open Source software, ham radio logging applications, answers to listener feedback, compile instructions for source builds and mention of a secret recording where Russ takes over another podcast and rules the world. Make sure to listen from beginning to end. You’re not going to want to miss a single second.

73 de The LHS Guys

The $20 Software Defined Radio

Introduction:

Despite my interest in boat-anchors I do find myself peeking ‘over the wall’ from time to time and taking a look at new and emerging technologies. After several demonstrations from friends I had become convinced of the incredible potential of software defined radios and even found thinking about owning one … one day.

Perhaps the best known SDR in amateur radio circles are the FLEX rigs from FlexRadio. I had the chance to see a FLEX-3000 in use during Winter Field Day 2011 and had to admit that, barring the lack of knobs & dials, it was a very impressive rig!
One thing stopped me from running out and buying one straight away was the cost and perhaps the notion that once the new had worn off I would regret the significant outlay required to own the blue box. So, I shelved the idea of owning an SDR and found other things to occupy my time.
This changed when a post on www.reddit.com/r/amateurradio/ mentioned an unmodified digital TV receiving USB device that had been used as a software defined receiver in the 60MHz – 1.7GHz range. The best part was the cost, around $20 for most examples of this kind of device. Finally software & commodity hardware had come together to deliver useful receiver that everyone can afford.
The nuts and bolts:

There are specific parts required to put together your own $20 SDR but I will document what I used to get mine running and hopefully you can follow along.
Hardware: The device that I used was a Ezcap EZTV668 DVB-T Digital TV USB 2.0 Dongle purchased from DealExtreme. The part was shipped from Asia and I gather from reading else ware that DealExtreme is a middleman and not the actual supplier. Be prepared to wait a while if ordering from this supplier, my Ezcap took about 3 weeks to arrive but I have heard that a month or more is not uncommon.
The upside is that shipping is free and your purchase involves 0% tax, this really IS a $20 SDR.
This particular DVB-T dongle uses the RTL2832U chip which is required for use as an SDR, other dongles with this chip may work but if it does not have the RTL chip it will NOT work currently.

Software (Linux) : After poor results with the software running on MS Windows I moved across to Linux and got it working well there. I can’t point you to a single howto for this because I used several different guides and tried a few things before it started working. The most helpful, and probably all you really need, are the build-gnuradio script which gets hardware support and gnu-radio running and the “Getting Started With RTL-SDR” page by Tom Nardi which covers installing Gqrx. All the software used is in development and requires familiarity with the command line to install and use at the moment.

Software (Windows) : I had another shot at getting the MS Windows software running and stumbled across the excellent website http://rtlsdr.org. Rtlsdr.org mentions using a new version of SDR# software which worked very well! 
I would recommend following the instructions under the Windows Software section, this had me up and running in a matter of minutes. Follow the instructions EXACTLY, I made life hard on myself by not paying attention to details and I think was responsible for my earlier issues.
Going further – Antenna : The stock antenna that is supplied with the Ezcap EZTV668 is sufficient for testing but you’ll want to add something a bit more substantial for regular use. You may even want to remove the existing (hard to find) antenna connector from the board and install a standard connector and a less flimsy metal casing. This will help with RF shielding and temperature stability. 
If you are going to use a larger antenna, especially an outside antenna, you’ll want to check to make sure a protection diode has been fitted to the input. The Ezcap EZTV668 is a very inexpensive device and others have found units in which the protection diode was not fitted to save costs.
Going further – 160M – 6M ? : I’ve just seen an interesting blog post titled FunCube Upconverter where the author, George Smart, has built a converter allowing the reception of 160M – 6M using the FunCube dongle. The FunCube is functionally the same as the RTL dongles available for $20. For any home brewers out there this could be a great project as George has included all the details including schematics and board artwork required to build the converter.


Update : Thanks to a link from Neil W2NDG to an EBay sale I’ve been able to track down a pre-assembled HF up-converter on this page : New HF Converter Kit for the SDR Fun Cube Dongle The price seems to be 45 euros, or about $55 US.

I’ve had a lot of fun using the $20 SDR to listen to AM aircraft traffic, local repeaters, emergency services and amazingly good quality broadcast FM stereo programming. Its easy to see, with an SDR, just how wide a radio broadcaster is transmitting and move your filter bandwidth to match.

Hopefully this is just the beginning of inexpensive SDR hardware that the radio community can re-purpose and re-engineer. 

Show Notes #083

Introduction:

  • Back from Dayton and ready to go.

Topics:

  • Dayton Hamvention 2012
    • LHS had the same booth as last year at North Hall #131. Estimated attendance was 25,000 individuals. Russ recounts the experience. Thanks to Matt, KC8BEW, who stopped by and helped out at the booth. The LowSWR podcasters stopped by, too.
  • FCC Dismisses Texas Ham’s Fourth Petition, Calls it “Repetitive”
    • Our hosts discuss.
  • Contest logging for Linux.
    • Several people at Hamvention asked about contest logging software for Linux, but Russ was at a loss for a recommendation. Upon his return, he discovered…
    • SO2SDR Contest Logging Software
    • Stefano, IZ3NVR/KD2BGM was trying to get so2sdr to work under Linux Mint and while it would compile, it did not run, so Russ set about trying to get it going.
    • It’s not packaged for Debian or Fedora, so it must be built from source, available at the link above.
    • The program is written in Qt, so it can be run on devices which support that environment, including Linux and Windows. Of course, Qt must be installed in order to compile so2sdr.
    • Russ also had to install the following packages on his Linux Mint machine: portaudio19-dev (NOT libportaudio-dev; apparently, libportaudio-dev is too old), fftw3 and fftw3-dev
    • The compilation procedure consists of:
                    qmake
                    make
                    sudo make install
    • so2sdr compiled and ran fine. It did complain that it wanted a parallel port for switching between radios, but you can ignore that if you don’t need to do that.
    • Russ gives an overview of the features and capabilities.
    • There are a few drawbacks:
      • An apparent lack of SSB support? It seems to be CW-only.
      • Frequency input checking is broken.
      • Keystrokes are not intuitive, but are well-documented.
    • However, the built-in help file is quite useful.

Feedback:

  • E-mail from Larry, KG4Q, extolling fldigi and JT65-HF. He wishes there was a version of JT65-HF for Linux. Well, Larry, there is! You can download the source here. Also, WSJT does JT65, too.
  • Chris, K4FH, caught up with Russ at Hamvention and talked about his Linux in the Ham Shack presentation. He managed to put together a fine bunch of slides completely without our help. Sorry, Chris!

Contact Info:

Music:

Show Notes #080

Introduction:

  • Tornado season has begun in Texas! Check out the videos at kcares.info

Announcements:

  • The donations for the LHS to Dayton Hamvention fund have stalled. If you’d like to see LHS return to the Hamvention this year, please make a donation in the next week or two. All donations will go toward the cost of the booth in the vendor exhibition hall. If we fail to raise enough to attend, then the funds will go toward the expenses of producing LHS.

Topics:

  • Richard’s Linux Adventures
    • Thank You Kubuntu, for once again obliterating Richard’s boot sectors.
    • Russ suggests using dd to perform what is essentially a low-level format of the drive. For example,
      dd bs=1m if=/dev/zero of=/dev/sda

      NOTE: This will totally erase your hard drive! Use caution!

    • Matthew, KC8BEW, in the chat room, suggests using Spinrite to repair a hard drive.
    • Richard declares that Debian is the Jesus Christ of Linux distributions, as it raised his hard drive from the dead, at least temporarily. It was the only distro he found that managed to install grub on the drive.
    • Richard also declares that Linux Mint sucks… at least for him. Audacity caused 100% CPU usage, spell check didn’t work, and it crashes.
    • Also discussed: CentOS, Scientific Linux, Fedora, PCLinuxOS, Xubuntu, lubuntu.
  • Richard is writing an ebook on the National Traffic System.
  • Russ again suggests Richard try Debian, but Richard says it won’t let him install Firefox. Maybe there’s a hardware issue? (Perhaps memtest might find a memory error? -Ed.)

Donations:

  • We received several donations from visitors to the Dalton Hamfest and the KARC Hamfest. Thank you to our ambassador Ronny (K4RJJ) and to everyone who stopped by our booth at those events.
  • Russ hoped to interview Roy, KK4ATD, our ambassador to the RARSfest last week. Apparently, the LHS booth was a great success.
  • If you’d like to be an ambassador for LHS at an event, email us at [email protected] and visit the Ambassadors link on the web site.

Feedback:

  • Fab, co-host of Linux Outlaws, left a couple comments on the website expressing his gratitude for being on the show.
  • Bob (W9YA) offers Russ some suggestions for entering the contact exchange information in YFKtest.
  • LinuxCanuck left a comment saying he enjoyed the episode with Fab, asks for help getting the feed links on the web site to work, and offers some thoughts about Kubuntu.
  • Roy, KK4ATD, the LHS ambassador to RARSFest, calls in to the show and describes the event. He’s also building a repository of ham radio packages for CentOS, called Hamux.

Contact Info:


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