Electro-mechanical Heaven.... with Hell (Hellschreiber)

Bob LeDoux sent us a link to a really amazing site about the Hellschreiber system.  The site is filled with great videos, pictures, and animations like the one above.  Lots of radio history too.  Check it out: 

http://www.nonstopsystems.com/radio/hellschreiber-function-operation.htm 
This is all the work of F. Dorenberg, N4SPP.  Thanks OM! 

Bob writes:   I'm working on a microcontroller based reader for
this mode.  For old fossils, like us, this mode looks perfect.  It can
be sent using simple CW equipment and it appears to be a great
replacement for those who are tiring of Morse code.
Its perfect for Knack victims. We can even build mechanical printers. Thanks Bob!


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Pete's Video on Connecting Arduinos and DDS chips (video)

After watching all Pete's work with the smaller Arduinos, that Uno R3 board seems HUGE.  That's what I should stick with.   Great idea using those robust terminal strips.  Thanks Pete. 

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Pete and Ben's "Let's Build Something" Direct Conversion Receiver

This direct conversion receiver is part of the "Let's Build Something"  project of Pete N6QW and Ben KK6FUT.  Publication will be in QRP Quarterly late in January 2015. Pete reports that the front panel is a piece of galvanized sheet metal from Home Depot –total cost 82 cents.

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N2CQR WINS ARRL SWEEPSTAKES! AGAIN! (video)

We did it AGAIN!   Winners in the Homebrew Double-Sideband QRP Northern Virginia Category!  Sweet!  I can't wait to pick up the trophy!   

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The Amazing Rigs of Lee Snook, W1DN

Back in March 2013 we ran a blog post linking to a video of a beautiful superhet receiver built by Lee Snook, W1DN (that's his shop).   Then the video disappeared.  Today Peter Parker, VK3YE, alerted us to the reappearance of the video.  Some Googling led me to Lee's YouTube channel and many other videos of some truly amazing homebrew projects.  

Here is his YouTube Channel:  https://www.youtube.com/user/swradios/featured

And here are all his videos: https://www.youtube.com/user/swradios/videos

Check this out digi fans (from his QRZ page):





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At the Comet

That's an awe-inspiring "selfie"!   This looks like something out of Kubrick's "2001 -- A Space Odyssey." Congratulations to the European Space Agency! 

Using the CIVA camera on Rosetta’s Philae lander, the spacecraft have snapped a ‘selfie’ at comet 67P/Churyumov–Gerasimenko. The image was taken on 7 September from a distance of about 50 km from the comet, and captures the side of the Rosetta spacecraft and one of Rosetta’s 14 m-long solar wings, with 67P/C-G in the background. Two images with different exposure times were combined to bring out the faint details in this very high contrast situation.


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Colin's BITX

With advice and tribal knowledge from N6QW and MeSquares from W1REX, Colin M1BUU, is making excellent progress on his BITX.  I see that he has some territory on the board reserved for a DDS VFO.  That's fine, but here's and idea for Colin and other builders:  Why not build it with the standard VFO first and then add the DDS or Si570 VFO later, perhaps as an external accessory?   That way you get the experience of building an LC VFO -- the full BITX experience. 

Yea, it is hard to imagine Paul M0XPD as a newcomer to the hobby such a short time ago -- he is definitely now in the ranks of the esteemed digital Elmers.   

And yes Colin, we do hope you avoid unwanted oscillations.  Because of Farhan's great design you have a good shot at avoiding this plague.  But be prepared OM.  It happens to the best of us.  A lot.   Stiff upper lip!  Never give in!  

*************

Hi Bill,
I enjoyed your video about your Arduino experiment. You bet me to it! I'm really looking forward to getting my version of an Arduino powered BITX up and running.

Steady progress is being made, yesterday I added my first bidirectional amplifier to the build. I now have the mic amp, BFO, balanced modulator and first amp completed. I tested the BFO on it's own and got a respectable looking signal out of it and with a good swing below 10MHz.

Next I need to add the crystal filter, second IF amp and mixer. Pete's video will help for the mixer! BTW, I'm using the ver3 schematic but I intend to use the ver1 band pass filter.

I set out building the circuit following the N2CQR layout diagram but I've already run short on space! I do have a good excuse though, my board is smaller than yours (10"x6").

Despite my best intentions, I'm falling back towards old habits of making my circuits physically small. I'm using MeSquares in order to try and force myself to space things out a bit. I do hope that I don't end up with any unwanted coupling!

I must try hard to leave lots of space between the next bits of circuit.

I was listening to SolderSmoke 104 today and Paul M0XPD was introduced as a new ham. Little did we know that Paul would become such a big player!

73, Colin M1BUU

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Tricycle Mobile Contact

I couldn't resist posting this picture of the vehicle used by Budd, W3FF.   I talked to him yesterday on 17 meters -- transcontinental -- as he pedaled home in California on his magnificent trike.  He wasn't using the quad in the picture (he was on a vertical). The  six meter quad is fantastic.  He worked Japan with this rig on six. He has a trike trailer that carries his linear amplifier. 

More on Budd and his trike mobile operations here: 
https://sites.google.com/site/w3ffhomepage/

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DDS amplifier

Tony, G4WIF, asked about an amplifier to boost the output of the AD9850 chip.  Here is Dr. Juliano's prescription: 

You might find that once you plug that DDS into a circuit you may not quite get 1 V pk to pk  and in fact after about 10 MHz it really starts to sag. See the attached drawing as you can put this “afterburner’ on the output of the DDS. The isolated output is good if you are interfacing with “toob” type equipment –it can be left off if you are doing SS or just left in place. This is the output from the amp and as you can see fairly clean.

 

73’s

Pete N6QW

 

 

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Digitizing my BITX17 with an Arduino and an AD9850 chip

This is only temporary!  My analog, discrete, hardware-defined BITX17 was NOT harmed or even modified for this little experiment. 

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