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I'm Steve Conklin, AI4QR

I'm employed by Canonical, Inc as a Linux Kernel Engineer. Interests include Linux, open source software and hardware, electronics and music, and amateur radio.

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6 February 10

My Excellent Book Day

There’s a great second hand book shop named “Beloved Community Book Store” at the Flying Monkey Arts Center. Today my wife Susan brought me a couple of books that she found that she just knew I would like. She had no idea …

One of them is “The Space Age” by Willy Ley. It is a first printing from 1958, and promises to answer the questions:

  • Where does space begin?
  • When will man make his first trip to the moon?
  • What is the latest information on flying saucers?
  • Have the Russians perfected an intercontinental ballistic missile?
  • Can space bacteria cause epidemics on earth?
  • How can you prepare for a space career?
  • When will we have passenger rocket ships?

This looks like a great book. Susan was right - I’ll enjoy reading it. But the second book - it floored me. It’s a pristine copy of “Rocket Manual for Amateurs” by Bertrand R. Brinley. This is a book that I spent innumerable hours consuming as a teenager. It was later severely damaged by water, and lost.

RMFA is a book that couldn’t be published today. Not because the information in it isn’t applicable, but because it would be perceived to be too dangerous, or too useful to “evil doers”. It begins with a defense against the anticipated argument of danger, so that concern isn’t such a recent one. This is a book aimed at young people. Young ~men~ specifically, but such were the times - and I’m glad we’ve moved past them more or less. From the first chapter:

” … I would say that it (an average rocketry organization) consists of seven bright young men between the ages of 13 and 17, one sympathetic and understanding parent or high school teacher who acts as an adult advisor for the group, and one engineer or chemist who acts as a technical advisor”.

This was a book full of real information. Rocket design and stability. Information about different kinds of propulsion. Nozzle design. Fin attachment. How to build static test stands. How to design a safe range. How to build launch and loading bunkers. How to track your rocket. Here’s one of my favorite illustrations - it’s not perfect because I didn’t want to break the delicate spine to scan it:

Loading a rocket engine

While only encouraging the use of a couple of relatively safe solid propellants, the book has information about a lot more. It was pretty heady stuff to read about hypergolic fuels, Fuming Nitric acids, and attempt to follow the trigonometry of trajectory analysis.

This book is where I learned about centers of pressure and thrust, where I learned that there are different alloys of steel and aluminum, and that they have numbers i.e. “SAE 1020 steel tubing”. Combined with the general environment of the Apollo program, and having a father working on the program, this book is responsible for a lot of the knowledge that later took me down what was a very interesting and rewarding career path.

I didn’t end up as a rocket scientist. But the book is a stepping stone that led to a career in special effects and fireworks, where I did build rockets but also so much more. It’s not surprising that Susan knew it would be something I would like, she knows me very well. I’ve looked for this book before, and found it only at proces I didn’t want to pay. I’m so glad to have it back on my shelf.  I went back to the book shop and paid the owner the difference between the song that Susan had paid and a fair market value. She’s a friend and a member of our tribe.

If you’re interested in the book, you can download a softcopy here.

Thank you Susan.

In a related anecdote - I also was a big fan of a book series titled “The Mad Scientists Club”. It was about the adventures of a bunch of boys who caused a lot of mostly harmless trouble, but all the technology in the book was plausible. I was a fan of both the RMFA and TMSC for years before it clicked one day that there was only one Bertrand R. Brinley and that he had authored both.

But wait, that’s not all! Arriving home, there was a package containing two copies of “Practical Arduino”, By Jon Oxer and Hugh Blemings. Hugh sent me a personal copy and one for the shelf at Antitronics. I can’t wait to read it. I’ll report back after I have. Hugh is my manager at Canonical. Well - sort of - as duties shift now and then. But this is the role I met him in. It didn’t take long to discover that we have a lot in common - microcontroller hacking, Arduino projects, Amateur Radio, and linux hacking. It’s been exciting to follow Hugh’s final stages in getting the book published, and I’m really happy for him that it’s out there.

Thank you Hugh.

OK, I have a bunch of reading to do now.

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13 January 10
Our Ubuntu kernel sprint in London has been going very well. Our focus this week has been sharing information with each other about how we do our work, to spread around some critical knowledge. This morning we walked to work in a snowfall.

Our Ubuntu kernel sprint in London has been going very well. Our focus this week has been sharing information with each other about how we do our work, to spread around some critical knowledge. This morning we walked to work in a snowfall.

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8 January 10
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4 November 09

Litl makes an announcement

Litl announced their product today. Since they mentioned their relationship with Canonical, I suppose it’s ok to say that I’ve had a litl bit (heh) of involvement with this. Wow, it sure does make me feel great to read

“… the Canonical folks have been great partners. It’s been a joy to get changes integrated upstream, and Canonical has done a lot of excellent work accommodating their distribution to litl’s unique needs.”

Here’s another link with some tech details.

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Posted: 10:26 AM

development tools for Intel graphics drivers on Linux

I love discovering new tools.

Lately my work on Ubuntu Linux kernels has had me paying closer attention to the Intel open source graphics drivers.

I’ve come across a few tools that are handy to developers and people with more advanced troubleshooting skills. One of those is intel_reg_dumper, which (not surprisingly) dumps the values of a whole bunch of internal registers from the graphics card. This comes as part of the xserver-xorg-video-intel-dbg package.

Read More

Tags: ubuntu linux
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28 October 09

fldigi presentation at HARC meeting

On November 6th I’ll be helping Dave Freese, W1HKJ make a presentation about fldigi to the Huntsville Amateur Radio Club. Fldigi is an amazing open-source cross platform application for communicating using sound card digital modes on amateur radio.

Dave is really knowledgeable about the encoding and error correction used for the various modes, and I learned a lot by helping him with a similar presentation at the Huntsville Hamfest this year. Our demo was cross-platform between Windows and Ubuntu Linux.

There are some really interesting uses being made of fldigi and some companion applications - sending digital files error-free by amateur radio. This is useful for emergency communications in post-disaster situations, when information must be accurately transmitted. Some of these applications do not use point-to-point connections, and therefore allow a file to be received by multiple stations at once. That way, if any station fails to receive the file correctly, they can get a “fill” from any other station who did get it.

It’s possible to perform these file transfers simply by holding the microphone on an FM radio near the computer speaker, and to receive them with a computer microphone near the receiver!

This should be a worthwhile presentation for people with any level of interest or experience in digital sound card modes. For more information see Dave’s excellent web site. Don’t miss his sights and sounds of digital modes page, especially if you’ve been listening to the sounds on the ham bands and wondering what modes they are.

The presentation will be November 6th at 7:30 at the American Red Cross chapter house, 1101 Washington street, Huntsville, AL. This is the regular weekly meeting place and time of the Huntsville Amateur Radio Club.

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23 October 09
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1 October 09

reverting from PPA packages in Ubuntu

PPAs on Launchpad are an amazing way to get the latest crack builds, which is useful if you track or contribute to an upstream project, or test new code to see if it resolves a problem. That’s what I’ve been doing this week - I  installed the latest Xorg crack on top of a karmic beta install.

If you visit that last link, you’ll find a description of how to install and use a package called ppa-purge, which will revert the PPA settings and restore the packages to the distro versions. This makes it much easier to restore the system, or even to bounce between the distro and bleeding edge versions and see what changed.

Tags: ubuntu linux
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30 September 09

Two new Linux/open source amateur radio projects

I just noticed a couple of new Linux amateur radio projects. The first is a D-Star compatible repeater - More info Here and the project page is here . I see no mention of source code or a license for the repeater code, but it is apparently based on Centos. The second project is an APCO-25 decoder, and is clearly available under the GPL.

Tags: hamradio linux
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16 September 09

HF Noise source found!

After months of suffering an intermittent HF noise problem, tonight I noticed it had settled into a cycle of 01:05 minutes off, 00:45 on. Hmmm. Streetlight? A walk around the neighborhood and I found it. Tomorrow, a call to Hsv Utilities.

Tags: hamradio
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Themed by Hunson. Originally by Josh