SolderSmoke Daily News -- Ham Radio Blog

Thursday, September 3, 2015

Five Lessons from Pluto for Homebrewers

http://www.edn.com/electronics-blogs/embedded-basics/4440230/5-Engineering-Lessons-from-Pluto?_mc=NL_EDN_EDT_EDN_today_20150901&cid=NL_EDN_EDT_EDN_today_20150901&elq=3e27f3c4018844db9381c8a508867555&elqCampaignId=24586&elqaid=27842&elqat=1&elqTrackId=06ba9f8cc21140c1ae477df75c36dd65

Thanks to Bob Crane, W8SX, for the link to this article. Those of us who are reading "The Martian" will find the mention of RTG power interesting (but hey, let's not try to put any plutonium in our rigs, OK?)

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Wednesday, September 2, 2015

Interview with Paul Horowitz (W1HFA) -- A Giant In Radio Electronics (Video)

I've been hearing about this book for years, but until I watched this interview, I knew nothing about the author. Thanks Lady Ada. (And thanks to Farhan for the alert.)

As a native New Yorker, I'm pleased to include in the blog yet another reminder that the Big Apple is not all fashion and finance -- a lot of solder has been melted in my home town.

Paul Horowitz has a truly awesome bio. He got his ham license at age eight. QST tells us that lots of little kids do this, but unlike some of the youngsters we see in the magazine I suspect young Paul really mastered the theory. Paul Horowitz has "The Knack." Big time.

PhD from Harvard. Author of "The Art of Electronics." Pioneer in the Search for Extraterrestrial Intelligence. Carl Sagan is believed to have modeled the main character in "Contact" partly on Paul. Check out the wiki page:

https://en.wikipedia.org/wiki/Paul_Horowitz

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Monday, August 31, 2015

"The Soul of a New Machine"

We talk a lot about putting soul in our new machines. The phrase comes from a book by Tracy Kidder. Ira Flatow of NPR's Science Friday recently took a new look at this book. There are TWO recordings in this link. Both are worth listening to. The second is an interview with the author, conducted at Google HQ in New York City. Woz chimes in.

http://www.sciencefriday.com/segment/08/28/2015/the-scifri-book-club-talks-the-soul-of-a-new-machine.html

At about 6:43 in the second interview, Ira Flatow and Tracy Kidder get into a little argument about how to pronounce the word "kludge." I'm with Ira -- the fact that he pronounces it this way makes me think that we are using a New York, or at least and East Coast pronunciation.

I am a big fan of Tracy Kidder. His "Mountains Beyond Mountains" is about Dr. Paul Farmer, a heroic physician who has dedicated his life to treating the poor people of Haiti. "My Detachment" is about Kidder's stint as an army officer in Vietnam. Kidder and his editor wrote a nice book about the crafts of writing and editing: "Good Prose." "Strength in What Remains" is about the genocide in Burundi.

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Awesome Kits from Austin Texas

http://www.qsl.net/k5bcq/Kits/Kits.html

If this is the kind of great stuff that results, then I agree with the bumper sticker:

KEEP AUSTIN WEIRD!

Scroll down to kit #25 for more details on the device pictured above.

Saturday, August 29, 2015

Adam Savage (Myth Busters) Interviews Andy Weir (Author of "The Martian")

I liked this interview a lot, and I am sure SolderSmoke listeners will like it too.
Weir admits to NOT having the Knack, but Mark Watney clearly does have it.

Also, check this out: http://www.cannonade.net/mars.php#map

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Friday, August 28, 2015

Knack Movie and Book -- SolderSmoke on Mars -- "The Martian"

I realize I'm very late in reading this book. Billy read it last winter. The movie is already coming out. I guess I didn't see the Knack element in this story until I saw the movie trailer. Wow. This is a book and movie for us. Dude is stranded on Mars and has to fix the radio (with Hendrix playing in the background). I'm reading the book now (appropriately, on my I-phone). I find myself thinking about the Elser-Mathes Cup.

More on the book here: https://en.wikipedia.org/wiki/The_Martian_(Weir_novel)

From the Wiki article:
Andy Weir, the son of a particle physicist, has a background in computer science. He began writing the book in 2009, researching related material so that it would be as realistic as possible and based on existing technology.^[4] Weir studied orbital mechanics, astronomy, and the history of manned spaceflight.^[6] He said he knows the exact date of each day in the book.^[7]
Having been rebuffed by literary agents when trying to get prior books published, Weir decided to put the book online in serial format one chapter at a time for free at his website.^[4] At the request of fans, he made an Amazon Kindle version available at 99 cents (the minimum he could set the price).^[4] The Kindle edition rose to the top of Amazon's list of best-selling science-fiction titles, where it sold 35,000 copies in three months, more than had been previously downloaded free.^[4]^[7] This garnered the attention of publishers: Podium Publishing, an audiobook publisher, signed for the audiobook rights in January 2013. Weir sold the print rights to Crown in March 2013 for over a hundred thousand dollars.^[4]
The book debuted on the New York Times Best Seller list on March 2, 2014 in the hardcover fiction category at twelfth position.^[

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Wednesday, August 26, 2015

Farhan's Secret Project: The SPECAN (Extremely Cool) (video)

I had been sworn to secrecy for so long, I thought I was going to burst. I almost hinted at this in the last podcast. But I didn't. I kept the secret. But now Farhan has made public his latest creation:

http://hfsignals.blogspot.in/p/specan-reboot-of-w7zoi.html

This is really great. I want to build one. I have to build one. I NEED one of these.

Great work Farhan. Thanks for bringing the ham community another amazing piece of gear.

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

SPECIAL 10th ANNIVERSARY OFFER ON SolderSmoke BOOK FREE DOWNLOAD

On the occasion of the tenth anniversary of the SolderSmoke podcast, I have reduced the price of the book "SolderSmoke -- Global Adventures in Wireless Electronics." I've taken the price as low as Amazon and Lulu will allow.

Here are the new prices. (These prices are temporary.)

FREE E-BOOK DOWNLOAD FROM LULU: http://www.lulu.com/shop/bill-meara/soldersmoke-global-adventures-in-wireless-electronics/ebook/product-20740433.html

Amazon Kindle e-book: FREE
http://www.amazon.com/SolderSmoke-Global-Adventures-Wireless-Electronics-ebook/dp/B004V9FIVW/ref=la_B001JOYVM4_1_1_title_1_kin?s=books&ie=UTF8&qid=1441406675&sr=1-1

Amazon Print version: $5.54: https://www.createspace.com/5109055

LULU Print versions: $4.45 http://www.lulu.com/spotlight/soldersmoke

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Monday, August 24, 2015

Unfazed! Fight HISS-teria! Give the Si5351 a Chance.

Thanks to all who have contributed to our discussion of phase noise and the Si5351 chip. Let me throw out some ideas -- some technical, others philosophical.

1) We may be worrying about this too much.   In all of the homebrew or kit rigs we've built over the years, I never recall much concern about the phase noise specs of the LC or crystal oscillator circuit that we were using. What were the phase noise stats on a Heath VF-1? How about the phase noise stats for the little Hartley oscillator in those DC receivers we made? No one even checked. Our rigs usually worked just fine. We would have noticed if they were extremely noisy, but if they were good enough, we left well enough alone.  It doesn't really make much sense for us to now be suddenly very concerned about the phase noise stats of the various DDS and PLL chips that are replacing those LC and crystal circuits, especially when the measurements show that they are usually in the same range as our old familiar oscillators.

2) The perfect can be the enemy of the good, and the "good enough." We have a long tradition in ham radio of tolerating less-than-perfect or less-than-optimum parts. Remember, the NE-602 has some shortcomings, but we use it. We use it a lot. The IRF-510 wasn't even designed to be an RF amplifiers, but we have pressed it into service for our PAs.

3) We should be willing to give a new part a try, and we should be pleased if it proves useful. We should be wary of untested claims re the unsuitability of a component. We have to avoid the "works in practice, but not in theory" situation.   If something works well, doesn't create additional QRM, is inexpensive, and fosters experimentation and homebrewing, we should be happy about being able to use it.

4) All electronic components -- not just the Si5351! -- produce noise. Resistors produce noise. Look at this:
" We can infer... that if we install phase-quiet oscillators in transmitter and receiver, we ought to be able to tune our receiver to a frequency closely adjacent to a very strong signal from the transmitter without encountering anything like phase-noise hiss. Yet, after an exhaustive phase-noise cleanup at transmitting and receiving sites, we test our communication system only to discover that the transmitter still emits broadband hiss! The culprit is transmitted amplifier noise. Just about every modern transmitter or transceiver consists of a high-gain, linear amplifier strip that amplifies the low-level output of oscillators, mixers and phase-locked loops to hundreds of watts or a few kilowatts. Because amplifier circuitry is not perfectly quiet, the output of the transmitter contains noise (hiss) in addition to the amplified signal. Transmitted along with the desired signal, this hiss can degrade the noise floor of nearby receivers-just as transmitted phase noise can. Where does amplifier noise come from? Thermal noise, for one thing. Electronic components operated at temperatures greater than absolute zero generate random electrical noise. This noise is broadband in nature. Greatly amplified in an audio amplifier-or greatly amplified in a radio transmitter, transmitted as broadband radio noise, received and converted to audio-it sounds like hiss. Random variations in electron flow within active amplifier components (transistors and vacuum tubes) are another source of amplifier noise. Transmitted as broadband radio noise, received and converted to audio, it also sounds like hiss." Source: http://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst/1988/03/page14/index.html

5) It seems that whenever a new technology or part comes along there will be those who issue dire warnings about how we can't or shouldn't use it.   When transistors came along, there were those who said that hams shouldn't homebrew with them because -- it was argued -- without spectrum analyzers we couldn't possibly come up with spectrally pure signals.

6) We have to be careful lest this obsession with perfection and extremely high tech standards be used as a rationale for not homebrewing, or (much worse) as an argument against homebrew rigs on the ham bands.   There is a bit of this going around.   Get on 40 meters with rig that drifts a bit or that is not "on frequency" to within 10 Hz and you will find out what I mean.

7) The Si5351 is a good part for our purposes. It does something new and VERY useful for us:   It can put out BOTH our VFO and BFO frequencies.   It makes it much easier for us to change bands and-or switch between USB and LSB.   Its phase noise figures are fine. LA3PNA (citing measurements by KE5FX) notes: "The phase noise of the Si5351 is around -130dBc/Hz at 10KHz. This is quite decent, If compared to a Hartley or Collpits you would see little or no difference. Some of my measurements of published free running oscilators show phase noise in the -110dBc/Hz range!"

-130 dBc/Hz at 10 kHz puts this part on the "good" curve of this chart. From (http://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst/1988/03/page14/index.html

We should give this little chip a chance! Give it a try!