Mechanical Memory Keyers

Billy and I went to the Rome flea market this Sunday and picked up a clock motor that may become the core of a mechanical keyer for the single transistor QRSS MEPT beacon we've been talking about. Unfortunately ours is battery powered -- we couldn't find any wind-ups that had a second hand.

I got an intersting e-mail on this subject from Gene, K8EE:

Mechanical Memory Keyer

Monday, March 16, 2009 6:44 PM

From:

"Gene Mayler" To:

n2cqr@yahoo.com

Hi Bill,
Just wanted to let you know that I built a mechanical memory keyer
back around 1960. It was very similar to the one you suggested in the
last "Solder Smoke." I built it for the radio club to use on Field Day. It
It used a phonograph motor to coupled to a mechanical variable speed
drive. A circular piece of PC board was attached to the output of the
VS drive. Patterns were etched on the PC board for the CW
messages, one to call CQ, one for the contest exchange and one to say
"tnx QRZ ...."

Of course, the variable speed can be achieved with a D.C. motor instead of
the mechanical VS drive. Todays computer software can create much
better artwork to etch on the PC board.

Unfortunately, I threw the thing out in the trash a couple of months ago. I
wish I still had it so that I could send you a picture of it. Oh well. What's
done is done.

Tell the guys that it CAN be done and it HAS been done.

73,
Gene Mayler - K8EE

SolderSmoke 103: Piper Cubs and MFJ Cubs

http://www.soldersmoke.com

In the SolderSmoke 103 Podcast:
15 March 2009
Beware the Ides of March!
Ostia Beach and Ostia Antica
248 Knights of QRSS. And Wizards!
ET Phones Home (with QRSS?)
Possible new grabbers in VK6 and Dubai
Telescope, Satellites...
REAL QRP QSOs on 80 and 40
Saving an old Toshiba Laptop
ECHO-QSO WITH JEFF, KO7M:
-- Piper Cubs and MFJ Cubs
-- Satellite QSOs
-- LT Spice and test gear
MAILBAG:
Gene W3PM listens from QE2, HB WSPR rig
Jim AL7V sending parts for my W3PM rig
Jim AB3CV's color burst Gnat
Jason NT7S on Tektronix guys and SolderSmoke
Kevin ZL3KE on old computers
Paul M1CNK's DDS 30-based QRSS beacon
Soeren OZ2DAK on exercise bikes to power beacons

G3ZJO: QRSS WIZARD!

Well, we're the Knights, right? So we should have a few wizards. Eddie, G3ZJO, should certainly be among those so honored. Above you can see his "G Beacon" MEPT transmitter. He uses two 555 chips to generate the G letter in Morse code. The longer chip on the bottom is (I think) the RF part of the transmitter. Ingenious. I also like his selection of frequency: 10140073 Hz. FB.

Eddie has a lot of other tricks up his sleeve, including the use of a Voltage Controlled Variable Oscillator driven by a PIC chip for a very simple WSPR transmitter.

These and other inventions can be seen on Eddie's YouTube page:
http://www.youtube.com/user/g3zjo (most seem to be done without audio).

Also check out his QRSS Beacon web page:
http://www.g3zjo.talktalk.net/qrss.htm

Thanks Eddie

Heavens Above

So I'm sitting there at 5:30 am talking on Echolink to Jerry, NR5A, in South Dakota about his ailing Pixie soon-to-be QRSS transmitter. All the talk about getting on the air and emitting signals causes me to get the urge to fix my antenna.

On Monday, I'd noticed (via Blackberry) that my signal had disappeared from ON5EX's grabber. I could see a signal close to where I usually am, but it looked a bit different. On closer inspection I saw that EA6FNF had fired up a very nice 50 mw DFCW beacon on around 10140060 Hz. My signal was gone. When I got home I discovered a broken antenna wire. Once again, ON5EX and the internet had, in effect, relayed telemetry about the status of my QRSS system.

Fortunately I could fix this from the window -- no roof work was required. Skies were fairly clear on Wednesday morning, and as I looked up across the Janiculum Hill at Rome's pre-dawn sky, I saw a satellite going over from North to South. Of course, I wanted to know what I was looking at, so I turned to Chris Peat's very useful web site, Heavens Above. Very quickly, I was able to find out that it was either the Russian Okean O Rocket, or something called RADCAT.

Check out Heavens Above. Lots of great info on astronomy, satellites, and ham radio spacecraft:
http://www.heavens-above.com/

The antenna was quickly fixed. I should be back on the Belgian grabber now. It was a good ham radio morning in Rome. Thanks Jerry. Thanks Chris Peat.

KO7M's Two Cubs (Piper and MFJ)

Jeff, Ko7M, travels around in this very cool Piper Cub. He has floats for it so he can land on water. He sometimes listens to SolderSmoke as he flies. Which brings us to his second Cub:

KO7M has built his first QRP rig!

Thursday, February 19, 2009 4:11 AM

From:

jeff

To:

n2cqr@yahoo.com

Bill, what have you done... You are killing me out here... :) You may recall, I am ko7m out in the Seattle area and I wrote recently about flying around with soldersmoke playing over my aircraft audio system.

Well... I have been systematically listening to every soldersmoke episode from the beginning... Not a small task... :) I am currently up to episode 80, so I am closing in on the prize of being current.

BUT!! You have completely afflicted me with the need to build something... Most of my ham life however I have been mostly an appliance operator it seems though I built a lot of tube equipment in my younger years, burned a lot of fingers and once launched myself across the shack when I took hold of a 750 volt plate circuit.

Therefore, I am not up to the task of designing something from scratch, but ya know... I just HAD to build something and NOW, so I went with a kit. So, not exactly knack-ish but ya gotta start somewhere, eh?

I went with the little QRP transceiver from MFJ called the "MFJ Cub". I picked up a 40 metre version of this little gem, plugged in my MP3 player with my current episode of soldersmoke and started GENERATING solder smoke! This little kit went together very easily during moments when I had a few minutes to work on it.

Well, this evening (it is now 01:00 PST) I finished up with my last little bit of solder smoke generation and the little rig is done. Now for the REAL smoke test...

Since I don't have a current limiting power supply, I went with a little nine-volt battery for the smoke test. The little power LED lit up and I heard a pop in the headset, nothing was getting warm, so things looked good. We went to the full 12 volt supply and I went through the alignment process by first setting the product detector's operating frequency to fall within the CW filter passband. I then used my Icom receiver to set the VFO operating range since I don't have a frequency counter. I then peaked the receiver bandpass filter for best sensitivity and lastly set the BFO to the correct sideband.

For the transmitter, I first set the carrier offset to about 600 hz from the received signal and peaked the transmitter bandpass filter for maximum RF output. I only have a simple SWR bridge for indicating a relative output level forward and reverse. Lastly, I set the power output level to about what I estimate should be about one watt.

Whoo hoo! Pulled off the dummy load and plugged in the G5RV and antenna tuner and started tuning around the low end of 40 metres and there were signals everywhere. Nice receiver in this rig. The tuning is a little fast, but managable. Seems to be very sensitive. I happened to catch the end of a CQ call as I was scanning around the band and when he signed I gave him a call.

To my complete surprise, he came back to me and gave me a 459 report... From Japan! I bagged a JA1 on my first QSO on a rig I built myself (or at least assembled). There is nothing better, I tell ya! I attached a screen shot of the Solar Flux level for my first QSO.

So... I am afraid to say you have reinstilled the need to melt solder in me after an absence of over 30 years. It is a disease I tell ya! I have located copies of both Solid State Design and Experimental Methods, which are both on the way and I am eagerly looking forward to figuring out what the next project will be.

The knack is returning...
Kind regards,
Jeff Whitlatch - ko7m

The Kettering Group: Satellite Pioneers

A while back we were talking about the Italian brothers whose satellite observation work got them caught up in some international intrigue early in the space age. This morning I came across some web pages about The Kettering Group, a group if intrepid British lads who were in the same game. Heartwarming stuff. I wish my school had been like theirs! Read about them here: http://www.svengrahn.pp.se/trackind/getstart/oldcyts.htm
More info here: http://www.svengrahn.pp.se/trackind/trackin1.htm#KEttrack

Clockwork CW: The Path to Minimalist QRSS?

Well, maybe not using that one. But something like it. The idea -- mentioned recently on the podcast -- is to use a mechanical clock mechanism to generate the CW for a QRSS beacon. This would allow us to get the transistor count for our beacon down to one. For some odd reason, some of us find this appealing, especially when you consider that the transistor count on the receive side is in the tens or hundreds of millions. One is the magic number. You can see how this project brings together two of the biggest littlest recent trends in the QRP radio: QRSS and minimalist radio.
It's kind of scary when you Google something and are referred back to your own blog. That's what happened to me on this subject. Back on May 28, 2008, this was posted (by me!) as a comment to one of the beacon-related posts:

Hello Bill and Others:
A few years ago, a buddy had made a neat keying operation made by taking a
one RPM clock motor and had it rotate a printed circuit board disk that had
the callsign etched on it several times sequentially. Clock motors are
made to run continuously for years, and it stood up with just an
occaisional cleaning of the wiper arm with spray cleaner.
All the best to all!
73 de Lee Smith VE4ANC

This message from Lee was a response to a January 1999 question from me. So we are sort of re-inventing the wheel here.

Of course, there are some QRSS beacon circuits out there with VERY low transistor counts. Hans Summers has one on his site that used a bi-stable multivibrator to generate a pattern for QRSS. That would yield a total transistor count of 2 or 3. But we are going for one single transistor. And I kind think we should look for something that will allow for the transmission of callsigns.

Here's an e-mail exchange from the Knights of QRSS mailing list that may generate some ideas:

Re: [Knightsqrss] Junkbox + soldersmoke = pattern generator

Saturday, March 7, 2009 10:43 AM

From:"Paolo Saia"

To:"n2cqr"

Very nice idea Bill. After tiny solar mepts this could been our next QRPP/ET challenge .
73 de Paolo IZ1KXQ
--------- Initial Header -----------

From : knightsqrss-bounces@cnts.be
To : knightsqrss@cnts.be,"Soeren Straarup" xride@x12.dk
Date : Fri, 6 Mar 2009 21:48:55 -0800 (PST)
Subject : Re: [Knightsqrss] Junkbox + soldersmoke = pattern generator
It would be fun if the clock were a "wind up" type. And for extra credit: Power the transmitter with the energy from the same spring mechanism (or other wind-up device) that powers the clock!
ET PHONE HOME!
--- On Fri, 3/6/09, Soeren Straarup <xride@x12.dk> wrote:

From: Soeren Straarup <xride@x12.dk>
Subject: [Knightsqrss] Junkbox + soldersmoke = pattern generator
To: knightsqrss@cnts.be
Date: Friday, March 6, 2009, 3:30 PM
Hi list,
Hans Summers has made an astable multivibrator as pattern
generator.
Bill Meara has thought about making a analog clock.
Alan Yates loves my idea of an exercise bike pattern
generator.
Though i'm open for suggestions. No pics, pc or
any other programmable
devices.

Rules of design:
1) KISS
2) Should be in most junk boxes
3) Pattern should be easily changed (diversity, more
homebrewers)
4) KISS
This is for a simple Pixie2 TX modified to be a QRSs TX.
Stability? SSShhh.
Vy 73 de OZ2DAK
Soeren Straarup | aka OZ2DAK aka Xride