Tag: sdr

Show Notes #084

Posted on by Russ Woodman

Introduction:

  • No music this time; just one hour jam-packed with LHS goodness!

Announcements:

  • Remember to sign up for the following LHS services:
    • The LHS SubReddit
    • The LHS Mailing List
    • The LHS Mobile app. Follow our updates via the mobile applications available for iPod, iPhone, iPad and Android devices.
    • Be an LHS Ambassador! Please join our Ambassador program. The event calendar has expanded quite a bit and we need your help. These events are now world-wide, so we could use some help outside the US as well as all over the country from California to Maine.
  • YFKtest: Yes, there really does seem to be a problem. It's been confirmed by John, EI7IG, that the program does not log contacts for the ARRL Field Day contest. Other contests work fine. Russ plans on emailing the developer, DJ1YFK, with these observations.
  • From the "Yes, It's an Antenna" File: Multi-band HF dipole made from horse fencing.
  • Pulling a Lunduke: Holding Source Code Hostage. Our hosts discuss this blog post by Tom Nardi about Bryan Lunduke's recent move to open source his software. Bryan is one of the hosts of The Linux Action Show.

Topics:

  • Software Defined Radio (SDR)
    • A common topic Russ encountered at Dayton was about the available Linux options for software defined radios.
    • GNU Radio Project
      • Version 3.6.0 released in early May, 2012.
      • Version 3.2.2 is in the Debian Sid repository.
      • The latest version can be retrieved with git. (Install git with the command "apt-get install git".) To download the software, issue the command "git clone git://gnuradio.org/gnuradio".
      • Build instructions are available for most of the major Linux distributions.
    • SDR Hardware
      • Ettus USRP series works with the GNU Radio Project software. There are various models ranging in price from $700 to $2000, depending on the frequency range and options. Various modules allow receive and/or transmit on bands from 30kHz to 5.9GHz. Unfortunately, power output appears to be just 50-200mW, depending on the bands provided by the transmitter daughter board chosen.
      • Funcube Dongle costs £128 (~$200) and is a receiver only. The Funcube Dongle is a "radio receiver designed to allow anyone to try their hand at reception of satellites like FUNcube". It covers 51.5MHz - 1.7GHz, less the region from 1.1GHz to 1.2GHz.
      • Perseus SDR costs $1000 and is also receive-only. It receives 10kHz to 40MHz.
      • SoftRock SDR is a kit available in various models from $20 to $90. Most are receive-only, but the Ensemble is a 1W HF transceiver. Some models are unavailable at the moment. The SoftRock RXTX Ensemble Transceiver Kit will allow you to build a 1W transceiver for one of the following bands or band groups: 160m, 80m/40m, 30m/20m/17m, or 15m/12m/10m.
      • RTL-SDR Devices range in price from $20 to $200 and are receive-only. More on the RTL-SDR project in an upcoming episode.

Feedback:

  • Stewart, VA3PID, wrote to say that Russ was the first person, possibly ever, to correctly place his Scottish accent at Hamvention. He also remarked (in reference to a discussion in episode 71) that Chirp has come a long way; it can now program his Yaesu FT-857D!
  • Jonas recently re-discovered LHS and expressed his appreciation for the show. Thanks, Jonas!
  • Stefano, IZ3NVR/KD2BGM, asks for more help getting so2sdr built on his Linux machine. Russ suggests installing the compiler with "apt-get install g++ build-essential", installing Qt and several other packages as described in Episode 83, then try building the so2sdr program again.
  • Lastly, David Dominicki left a mostly unintelligible comment in response to Episode 78. Um, thanks... we think.

Contact Info:

  • Contact Richard at kb5jbv@gmail.com, Russ at k5tux@lhspodcast.info, or both at the same time at info@lhspodcast.info.
  • Listen to the live stream every other Tuesday at 8:00pm Central time. Check the LHS web site for dates.
  • Leave us a voice mail at 1-909-LHS-SHOW (1-909-547-7469), or record an introduction to the podcast.
  • Sign up for the LHS mailing list.
  • Sign up for the MAGNetcon mailing list.
  • LHS merchandise is available at the Merch link on Web site. Check out the Badgerwear or buy one of the other LHS-branded items at PrintFection.com/lhs or Cafe Press. Thanks!
  • Thanks to Dave from Gamma Leonis for the theme music.

Music:

  • None.

LHS Episode #084: GNU Radio

Posted on by Russ Woodman

The 84th installment of your most favoritest podcast is now in the wild. As you may have noticed, we make a lot of assumptions about our listeners on this show; for example: You all love us. We have a good show in store for you today, including antennas made from electric fencing, a question about whether GPL software can be profitable, and most importantly a look at software defined radio and the GNU Radio project. Towards the end we address some feedback, solve a technical problem in Italian and try to stage an intervention for one of our more peculiar fans. ALL THIS WEEK on Linux in the Ham Shack!

Podcast: Play in new window | Download

LHS Show Notes #048

Posted on by Russ Woodman

Feedback:

  • John, KF6EFG, commenting on the OGG vs. MP3 debate in episode 43, agrees that MP3 is the preferred file format because that it is supported by most media players. He realizes that OGG is superior, but until vendors like Apple support it, it will not gain on MP3. Richard thinks it's because Apple cannot add DRM to OGG files. Russ thinks that if Apple did use OGG, they'd sell more iPods. In any case, LHS will not drop the MP3 feed.
  • Lief, KC8RWR, writes a detailed reply to comments Randall, KC4WZE, made in episode 44 about running the same applications on cell phones and computers. There is a way to hack an Android phone to run Debian, or run Android on your desktop. Check out the TuxPhone project. Richard and Russ discuss.
  • John, EI7IG, was interested in the discussion of Logbook of The World in episode 43. He pointed us to www.rickmurphy.net/lotw for a newer version of TrustedQSL created by Rick Murphy, including a Linux version. Russ tried it and it works. (Ed. note: The softare is no longer available on Rick Murphy's site. Evidently, it has been obsoleted by Trusted QSL 1.13 from ARRL. Linux source packages to compile the library and program are available from the LoTW Instructions page.)
  • David, M0DCM, writes that he was recently at the Telford Hamfest and found that Linux was represented there, thanks to the Shropshire Linux User's Group and MAXPAK, the Midlands AX25 Packet Radio User Group. They had demonstrations of Linux machines running Fldigi and WSPR, showing just how far Linux has come. They gave away a bunch of Ubuntu CDs, some to LHS listeners! (A couple UK podcasts for ham radio and Linux are the ICQ Podcast and the Ubuntu UK Podcast.)
  • Russ was at the Joplin ARC Hamfest and had the LHS booth there. He gave away 20 Ubuntu 10.04 CDs. WebSDR was a big hit, too.

Announcements:

  • May 6-7, 2011: MAGNet Conference in St. Louis, MO. See magnetcon.info for information. If you know anyone that might be a sponsor, exhibitor, or speaker, please let us know. Application forms are available on the web site. Registration will begin December 1, 2010. There will be a live music concert and coctail hour at the close.
  • Links to LHS merchandise have been added to the LHS website. Click the SHOP! link under the banner.

Topics:

  • Websites of interest:
    • Ubuntu Linux for Hams, by Bert, AB0VI, was featured on the main ARRL web page.
    • My Ham Shack provides a free personal web page for ham radio operators. Lots of guys post pictures of their shacks, QSL info, equipment list, etc.
    • It's More Complicated Than That!. A blog by one of the Ubuntu developers, Steve Conklin, AI4QR. Recently, he's been working on controlling a Softrock software defined radio (SDR) with Linux.
  • Linux ham software:
    • More ham radio applications are showing up in the Linux repos, like PSKmail, bulletin board programs, and more. Richard begs for someone to update the 2001 Linux Amateur Radio AX.25 HOWTO.
    • CallGit, a callsign lookup tool that retrieves data from QRZ.com.
    • gPredict, a real-time satellite tracking and orbit prediction program.

Contact Info:

  • Contact Richard at kb5jbv@gmail.com, Russ at k5tux@lhspodcast.info, or both at the same time at info@lhspodcast.info.
  • Listen to the live stream every other Tuesday at 8:00pm Central time. Check the LHS web site for dates.
  • Leave us a voice mail at 888-455-0305 or 417-200-4811, or record an introduction to the podcast.
  • Sign up for the LHS mailing list.
  • Thanks to Dave from Gamma Leonis for the theme music.

Music: