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Welcome to Ham Radio Data Center, free diy schematics and datasheets

5th Dream PC unveiled - Scan Jellyfish

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Every year we challenge the world's leading professional PC builders to craft the most technologically advanced, innovative, eye-catching PCs they can. We call this competition Dream PCs, and here is the fith and final entry - the TEC water-cooled Scan Jellyfish.

Read more: bit-tech.net Feed


The NZ4O Propagation Forecast

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The NZ4O Daily LF/MF/HF/6M Frequency Radiowave Propagation Forecast #2009-38 has been published on Friday 10/23/2009

Read more: Southgate Amateur Radio Club RSS Feed


Pimp my Netbook... Japan Style !

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Momoka Eri, a Japanese model which is also a talented business women, she owns a company which decorate Mobile phones, PSPs, DS and so on. . . Is apparently an Aspire One owner as well.

Read more: New from Electronics Infoline


Video: Dundalk Amateur Radio Club Celebrates 40 Years:

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Calling out across the world -- that's what members of the Dundalk Amateur Radio club do on a regular basis.

Read more: eHam.net News


Rota-Rota USB hub doubles as a thermometer for reasons unknown

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You know whats not uncommon on Brando USB hubs? Weird things. You know what is uncommon on USB hubs in general? Thermometers. The Rota-Rota hub takes USB hubs where theyve likely never, ever been before (and may very well never return to) by including a trio of rotating USB ports, a multicard reader and dials that read out the current room temperature in both Celcius and Fahrenheit.

Read more: New from Electronics Infoline


DX News -- ARRL DX Bulletin #43:

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This week's bulletin was made possible with information provided by NC1L, VK5ZD, QRZ DX, the OPDX Bulletin, DXNL, 425 DX News, The Daily DX, Contest Corral from QST and the ARRL Contest Calendar and WA7BNM web sites. Thanks to all.

Read more: eHam.net News


MARS Cuts Ribbon on New Pentagon Station

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A military institution designed to provide emergency communications has moved to new quarters in the Pentagon. On October 21, John G. Grimes, the former Assistant Secretary of Defense for Networks and Information Integration, cut the ribbon on the new Military Affiliate Radio System (MARS) station, now located on the fifth floor of the Pentagon. The facility -- manned by the Pentagon Amateur Radio Club (PARC) -- is packed with amateur radios, radio-telephone patches, computers and data links. "This is a great facility, manned totally by volunteers," Grimes told the crowd who came to see the new station. "It's a crucial capability for our country."

Read more: ARRL Amateur Radio News


Barco Provides Light for Season of Light Festival

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Barco is a global leader in projection technology. Today, the company announced that they were selected for Finlands Season of Light festival.

Read more: New from Electronics Infoline


Palm finally manages to bore us to tears with webOS Mojo SDK tutorial

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We knew this day would come, and at last weve been faced with 56+ minutes of webOS-related video that we could barely keep our eyes open for.

Read more: New from Electronics Infoline


VXI offers B250-XT BlueParrot Wireless Headset

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Most of us want Bluetooth headsets that are a small and unobtrusive as possible. This leads to some compromises in sound quality at times though. If you are the type who wants comfort and call quality above all else, VXI has announced a new Bluetooth headset that you might like.

Read more: New from Electronics Infoline


Digicel Coral-200 Solar Power Mobile Phone

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Digicel announced the launch of a new solar-powered handset at MWC 2009 this week called the Coral-200-Solar. The handset has solar panels on the rear of the phone.

Read more: New from Electronics Infoline


Aliens vs Predator demo now on Steam

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Sega and Rebellion have released a multiplayer demo of Aliens vs Predator.

Read more: bit-tech.net Feed


coders at work

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Peter Seibel was kind enough to send me a sneak peek of the book about a month and a half back. What follows is a set of notes I wrote down while reading the book. I should admit that my notes below are not very well organized. I have tried to write down some of the things that I felt as inspirational and important. I hope that won’t get into the way of what I wanted to say about the book.

The book is a collection of conversations with some very well known figures in the computing world. These people have done significant contributions to the body of knowledge and are “inventors/practitioners” of Unix/C, Lisp, Java, Erlang, TeX etc.

Peter has done a great contribution to the computing world by bring out this book (not to mention his other great book “Practical Common Lisp”). The subjects seem to have been very carefully chosen and are
experts in their respective fields. But did I miss anyone? Yes, Richard Stallman. He has done some really great deal of programming, all by himself. Nevertheless, this book is a great contribution into the field of Computing folklore and biographies and is very very inspirational. Hats off to Peter for painstakingly undertaking this massive activity of researching the backgrounds and also for researching various topics. It is not easy to talk to these great people in the same language.

The questions are spontaneous and encourages the people to open up the story gradually. Mix of context specific ones and generic ones. Peter also seem to have been careful about not getting into a duel on various usual flamewars. For instance, Peter never asked the question “Vi or Emacs?”.

These are some of the questions, Peter seem to have asked everyone.

  • When did you start to program? (A great deal discussion follows on details about the machine and methods used.)
  • What are your usual ways of debugging? Do you use print statements or use a debugger ?
  • Do you consider yourself as a programmer or an engineer or a craftsmen or an artist?
  • What are the differences between programming and prose writing?
  • What is different in the programming between then and now? This is usually followed by really good discussions of the difficulties of modern day coding with layers on top of layers. Even though source code is available, the sheer amount of knowledge on various libraries and abstractions built by modern day computing systems make it very difficult for a newbie to understand what is going on under the hood. It also make the system inefficient because the computing hardware has become better and cheaper and so no one cares for these things.
  • What are your favourite programming books? Needless to say, “The art of computer programming” is in the list. Some said, they read all volumes cover to cover.
  • What is beautiful code? Importance of reading good code.
  • How do you read code?

It is amazing, how early some of the people touched their first computers. Remember these are 60s and 70s and not even 80s. Contrasting this with my own experiences, I think I am one of the many  nfortunates who had no idea what computers are until I went to the college for undergraduate degree.

It is also amazing to see that these folks are still tinkering with the machine and programming, pretty much every day. In contrast, my job is trying to keep me away fron hands on programming. I am instead trying to work with what others have done and bending it to work with other things and in the process, not writing much code at all.

The discussions are very casual and not formal. It will be very interesting to hear the audio recordings of these conversations, which will obviously have much more interesting anecdotes and stories which Peter couldn’t have been able to incorporate into the book. Most subjects are older programmers. There are few younger ones.

  • Fitzpatrick: Importance of statistics.
  • Peter seem to have researched his subjects very well and have digged most of the information about them off the web. For example, he talks about Fitzpatrick’s student day Livejournal entries, one of which said, he was stressed out and hated computers.
  • Most people used print statements instead of symbolic debuggers.
  • C++ hate seem to be a common thread.
  • code reviews as a pre-commit step.
  • bottom-up approach to coding. One exception was Joshua Bloch who said, he does the APIs first and then the implementation, which felt like a top-down method to me.

Some quotes from the book.

  • “C is a portable assembler”
  • “You can reason from effects back to causes. Which is the whole game in debugging”
  • “I tend not to buy into religions, any religions, whole hog. Whether it is object oriented programming or functional programming or Christianity or Judaism, I mine them for good ideas but I don’t practice them in toto.” : Joshua Bloch
  • ” Oh, it’s not worth the time, it’s just the name of a variable, just don’t get it. You’re not going to produce a maintainable program with that attitude.” Joshua Bloch
  • brilliant quote by Tony Hoare in his Turing Award speech about how there are two ways to design a system: “One way is to make it so simple that there are obviously no deficiencies and the other way is to make it so complicated that there are no obvious deficiencies.”
  • “Bloch: I believe that code ownership can’t be denied. In a way, it’s  like motherhood – you give birth to the code that you write, and especially  if it is large, complex or original, it is yours.”
  • Joe’s Law of Debugging, which is that all errors will be plus/minus three statements of the place you last changed the program
  • “Just start something, no matter how humble.” John Washbrook, a senior academic told Simon Peyton Jones. How true this is, as one begins a new programming project with a blank editor in front.
  • “programming languages are the user interfaces of programming”: Simon Peyton Jones.
  • “Every five pages of my book is somebody’s career” : Donald Knuth.
  • “The first rule of writing is to understand your audience—the better you know your reader the better you can write, of course. The second rule, for technical writing, is say everything twice in complementary ways so that the person who’s reading it has a chance to put the ideas into his or her brain in ways that reinforce each other.” : Donald Knuth
  • “The problem is that coding isn’t fun if all you can do is call things out of a library, if you can’t write the library yourself. If the job of coding is just to be finding the right combination of parameters, that does fairly obvious things, then who’d want to go into that as a career?” : Knuth

Guy Steele and Peter Norvig interviews turned out to be great. I then read Simon Peyton Jones and that was great. Every interview turned out to be better than the previous one, whichever order you read it! I
just wished there were more. May be dead tree books are a bad choice for such things.

Ken Thomson’s interview had quite a lot of surprises. I just loved this interview. Ken just opens up his mind on various very interesting things.

Peter, though an author of a successful Lisp book, never gets into an argument with Ken Thomson, when he kind of, thrash the Lisp machine concept and the mentality of MIT hackers at that time to compete with the Unix. I was also surprised when Ken said he had not heard of the “Worse is better” paper of Richard Gabriel which compares the Boston style vs New Jersey Style of computing. I also couldn’t justify the vague answer Ken gave regarding Buffer overflowscaused by slppy coding of C/C++ programs. Also Ken said, at Google he has no check-in rights. He also said he despise C++ (like many others in the book and elsewhere) developed by his ex co-worker. C++ has too many features and everyone use a subset of it. Ken clearly says that it is a badly designed language.

Ken also says about the well known story of his wife and kid who went away for a month when Ken was happily programming pieces of Unix at a fast pace. Ken says that when your wife and kid are away, you no longer have to sync with the Sun’s cycle of 24 hours and that he never experienced any stress during that time. Ken also feels (like his friend Rob Pike) that nothing new is happening in the computing world. According to him, the last significant change was the Internet. Ken also shares the same thought, which many others also expressed, that the modern day programming is all about layers on top of layers on top of layers and that a program depends on 40 different libraries which in turn depends on more libraries and at some point, one just can’t keep all that in one’s head. On top of it, things are now distributed with messages being passes from one place to another. Modern day free software projects like GNOME and Mono and gtk are good examples of this phenomenon. Personally, I find it extremely hard and intimidating to even figure out where to start looking if I see a problem and the very thought of it scares me away from such an undertaking. One instance is that on my laptop, the speaker volume control always resets to mute every time I bootup, no matter what the volume level was during the previous bootup. I had been trying to track the problem down for quite a while and finally the layers scared me away and I gave up.

There are some good discussions and contrasting opinions on Unit Testing and how and when to do it. Some of these have hit the headlines recently.

Overall, it is a very inspirational book for programmers and everyone interested in the craft or art or religion or whatever you call it, should read it.

Read more: VU3RDD Station Log


ALPHA 76PA 1500 + WATT 160-10 METER AMPLIFIER - 1,500.00 USD

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User Rating: / 1
Alpha/Power was founded more than a quarter century ago as ETO (Ehrhorn Technological Operations) to design and manufacture the best possible maximum-legal-power, continuous heavy duty, HF linear amplifier for radio amateurs. Alpha Amplifiers are known to operate keydown at full power output and no time limit and are used by hams, commercial and government transmiiters. The Original Alpha ETOs are known to be the best and today cost as much as $10,000. The ALPHA 76 Series Amplifiers are legendary and made by ETO Alpha, the first Alpha developer and best manufacturer of Alpha Amplifiers which are the Best Ham Radio Amplifiers in the World. ALPHA 76 supports 160-10 Meters and has convenient dual meters on the front and is one of the Most Rugged and Desirable Amplifiers ever made. ALPHA 76PA has THREE 8874 Final Amplifier tubes and delivers an easy 1500+ Watts Output and up to 2000-2500 Watts Output on CW, this ALPHA 76 has THREE 8874 final tunes. Manual available to download at: ftp:/bama.sbc.edu/downloads/alpha/76a/ She is currently wired for 220 Volts AC, can easily be switched to 110 Volts AC and measures a Very Compact 7.5H x 17W x 14.75D from an engineers estate at $1500.

Read more: Just Listed: HamBid - The Ham Radio Auction Site


G.Skill Falcon 128GB SSD Review

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The SSD market has been really hotting up lately, and today we're looking at another contender in the form of the G.Skill Falcon. Sporting the same drive architecture as the OCZ Vertex while costing a lot less, is this the SSD you're upgrade's been waiting for?

Read more: bit-tech.net Hardware Feed


NTT docomo and Sharp show projector phone at MWC

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We had a brief peek at yest another pico projecting set at MWC, this time an NTT docomo Samsung affair without a name, price, or even a release date.

Read more: New from Electronics Infoline


Joby Gorillamobile Tripod for Mobile Phones unveiled

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Joby is known for their flexible Gorillapod tripods for cameras. Now Joby unveiled a Gorilllapod designed for mobile devices dubbed Gorillamobile. The Gorillamobile is ideal for mobile phones, PDAs, MP3 players, portable gaming devices, GPS units, mini video cameras, pocket projectors and almost any other mobile device a you might want to utilize in a hands-free manner.

Read more: New from Electronics Infoline


Christie Will Host 34th Toronto International Film Festival

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Christie is a global leader in visual solutions for business, entertainment and industry. Recently, the company was proud to announce that they were selected to help host the 34th Toronto International Film Festival.

Read more: New from Electronics Infoline


Myvu and SENSIO show some Mobile 3D Stuff at CTIA 2009

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Myvu, a maker of personal Media Viewers and SENSIO Technologies Inc. , a 3D distribution technologies provider, announced today that the they will jointly demonstrate a new 3D mobile video platform based on SENSIO 3D and the Myvu Crystal Personal Media Viewer at CTIA 2009 in Las Vegas.

Read more: New from Electronics Infoline


Will The New Macs Take The Wind Out Of Windows 7?

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Today was a big day for Apple. After a brief period of downtime, a whole new line of Mac products launched in the Apple store. New products include a revamp of the Mac mini and MacBook lines, a new Magic Mouse, and new 27 and 21.

Read more: New from Electronics Infoline


ARRL Headquarters Closed for Christmas, New Year's Holidays

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ARRL Headquarters will be closed Friday, December 25, 2009 and Friday, January 1, 2010 in observance of Christmas and New Year’s Day. There will be no W1AW bulletins or code practice transmissions those days. There will be no ARRL Letter  or ARRL Audio News on Thursday, December 24 and 31. ARRL HQ will also close at 2 PM EST on December 24; there will be no afternoon W1AW code practice transmissions that day. We wish everyone a safe and joyful holiday season and a prosperous 2010.

Read more: ARRL Amateur Radio News


Gateway Unveils LT21 Netbook with Atom N450

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Gateway has unveiled the LT21 Series netbook, featuring a 10. 1-inch display and the latest Intel Atom platform. Weighing 2. 76 pounds, the Gateway LT21 includes the Atom N450 1.

Read more: New from Electronics Infoline


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