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Electronics Flea Market, 2016 Edition

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5/16/2016 01:20 PM EDT

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HughV
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Re: envious....
HughV   5/24/2016 2:46:31 PM
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OK, I made a flame speaker once for a middle school peoject.  Radio Electronics or Popular Electronics had an article, iirc.  Blow torch, asbestos wick feeding some potassium nitrate solution to the flame for some conductive ions.  2 tungsten electrodes in the flame.  My dad and I ended up getting some sound by connecting directly to the 807 tubes' plates in his push-pull Williamson mono amp (he built, including winding his own transformers, for the home hi fi system!).  Not exactly high quality sound but it did make noise that could be heard above the sound of the torch!  Fun.  Alas too many volts DC, to say nothing of the flame, to bring it in for show-and-tell....

-Hugh V, son of Vartan V

tb100
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Re: Morse Code as keybord replacement
tb100   5/23/2016 12:09:02 PM
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I've always thought it be interesting to have a texting app that used Morse Code. This would give you lots of opportunity to practice, and you wouldn't have to hunt and peck tiny letters on a touch screen--just tap on a large space on the screen.

You could even have a way to secretly receive text messages by having the phone use a Morse Code vibration mode in your pocket while you are in a meeting.

Stargzer
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Re: Morse Code
Stargzer   5/23/2016 11:50:24 AM
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@betajet: I think it's patently absurd that people are using two thumbs to hunt-and-peck on a tiny QUERTY keyboard when they could text much faster in Morse code.

I don't hunt-and-peck.  I took typing my senior year of high school in 1969 and have used it ever since.  My aunt gave me a portable typewriter for high school graduation, so in college I made my beer money typing papers at $1 a page; I supplied the paper (corrosible, with the red lines to make setting margins easy) and grammar checking.  It came in handy for keypunching programs, too.  Since my handwriting was so terrible, I cadgered an old typewriter at work early on in the days before word processors and PCs. On my Crackberry my thumbs have learned what the other digits have long known: where the keys are.  I'll even admit to having texted while driving, one character at a time, the same amount of time as looking in the  rear view and side view mirrors.  A quick look at the keyboard to verify orientation and the thumb takes over. 

The the fastest typist I know is a coworker who retired a few years ago. He was also a concert pianist in his youth, so his fingers really flew over the keyboard on a terminal.  He was a sharp programmer -- to him, a Macro Assembler was a high-level language.  He had a library of IBM 360/370 macros that he used.  When he bought a Z-80-based PC he ported his IBM macros to the Z-80 macro assembler.  He liked the Z-80 Block Move instruction so much that he wrote a IBM macro to emulate it to use in his mainframe work. 

 

David Ashton
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Re: Morse Code
David Ashton   5/19/2016 4:39:43 PM
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@Crusty,Antedeluvian yeah, but he says that to everyone.  I think he's on the side of the lotto, not us....

MeasurementBlues
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Re: Morse Code
MeasurementBlues   5/19/2016 2:05:12 PM
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@KB6NU,

Enjoy the hamfest, Dan.

traneus
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Morse Code as keybord replacement
traneus   5/18/2016 6:56:32 PM
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betajet asks about using Morse code to input data, instead of a keyboard. I have given this some thought, and I think the problem is harder than it looks, beyond having to learn Morse plus learning extensions to handle lower case and other ASCII characters. Morse characters have less than eight dits or dahs (with one exception that I recall), so eight-bit ASCII could be used as an extension of Morse.

We are taught that Morse code has two symbols: dit and dah. Actually, Morse has five symbols: dit, dah (3x length of dit), dit_length_space (separates successive dits or dahs), dah_length_space (3x length of dit_length_space, separates characters), word_space (7x or more length of dit_length_space, equivalent to ASCII 0x20, separates words).

Timing-based decoders for hand-keyed Morse have historically been unreliable due to variable human timing. To get accuracy, I think a symbol-distinguishing encoding method is needed, which requires more than a hand key for input due to the five symbols.

The Museum of Fine Arts in Boston has on display a chandelier blinking a Morse message, with the message also displayed on a computer monitor. I found the message to be uncopyable, because the artist used dit_length_space between characters where they should have used dah_length_space.

 

Clive
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Re: Morse Code
Clive"Max"Maxfield   5/18/2016 1:18:50 PM
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@KB6NU: ...This afternoon, I'm heading to the Dayton Hamvention...

Oooh -- you lucky scamp -- I (and some EETimes community members) went last year and it was GREAT!

Crusty1
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Re: Morse Code
Crusty1   5/18/2016 12:27:21 PM
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@antedulvian,David

However infinitesmal the odds of winning are, they are infinitely greater when you buy a ticket!


I was mentioning to a very senior diety that he had not seen fit to grant me a lotto win, and his answer was just the same buy a ticket for goodness sake, before I can do the magic.

This is a very old East End of London joke.

betajet
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Re: Morse Code
betajet   5/18/2016 11:19:13 AM
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I never learned Morse code properly, although I'm still amused by "Three-dit four-dit two-dit dah, St. Mary's High School rah rah rah".  I also don't have a smart phone.  But if I did, it seems to be that it would be a whole lot faster to text in Morse code using by simulating a high-speed telegraph key.  I think it's patently absurd that people are using two thumbs to hunt-and-peck on a tiny QUERTY keyboard when they could text much faster in Morse code.

RadioGraybeard
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Re: Morse Code
RadioGraybeard   5/18/2016 10:52:53 AM
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Now that is impressive, If you are think of giving us other oldies advice on how you manage this, then I am fairly sure you will be so much in demand you will no longer have any spare time.  

Crusty, I wish I knew a deep secret to tell you, but it just worked out that way.  No family living nearby to ask.  All my friends are rather independent. 

 

 

 

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