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Tuesday, May 11, 2010
The DaVinci Altoids LED 30 Meter Multi-vibrator MEPT Transmitter
This rig has evolved quite a bit. It started out as a frequency standard for QRSS and was mounted inside a paperback copy of Dan Brown's book. Then I matched the oscillator up with the multi-vibrator pattern generator from one of Hans Summers' rigs. This week I decided that I really needed a buffer and a PA -- I needed a bit more stability. I'll try to post a schematic tomorrow. In the meantime, watch for my little signal on the ON5EX grabber (off to the right). The pattern is small (3 Hz) bumps, about 4-5 per minute.
Saturday, May 8, 2010
First Transatlantic Transistorized QSO
The online Transistor Museum has a wonderful new article about this historic event, with details on the rig and the operators. Check it out:
http://semiconductormuseum.com/HistoricProfiles/Raytheon_TransAtlantic_Transmitter_Profile_Index.htm
Thanks to AA1TJ for alerting us to this.
The Limerick Revolution
Today G-QRP club announced the release of a Limerick kit version of G3RJV's Sudden receiver.
Take a look at the final product and the boards:
Very nice. Read more about this wonderful kit here: http://www.gqrp.com/sudden.htm
Go Limerick! Go Sudden!
Thursday, May 6, 2010
QRSS LED FSK Experiments: More Blue vs. Red
Just to make Hans happy, I switched from a forward biased blue to a reverse biased (upward pointing) red diode. The resulting pattern (below) looks a lot like the pattern shown in the picture in Hans' excellent SPRAT article. This is clearly FSK. The positive voltage from the multivibrator increases revers bias on the LED, DECREASING capacitance and RAISING the oscillator frequency. In the curve of the leading endge of the pattern you can see the voltage from the multivibrator slowly rising. FSK here is "right side up."
Finally I tired a little 1N914 diode forward biased. I was hoping to see some cleaner switching action, but even with this little diode you can see quite a bit of varactor action at work:
I think the switiching would be a lot cleaner and more complete if the voltage from the multivibrator wasn't coming through a 1 meg resistor. But when you put a lower resistance in place of the 1 meg ohm part, you start to mess up the frequency of the multivibrator.
I have to say, my favorite pattern is that from the Blue diode forward biased. Sorry Hans. To each his own...
Wednesday, May 5, 2010
Altoids to the Max!
http://blog.makezine.com/archive/altoids_and_tin_cases/ The first one that appears seems to belong somewhere else -- just scroll down to find the tins.
Wiki provides background info:
Altoids are a brand of breath mints that have existed since the turn of the 19th century. Altoids are less widely available in Britain—their country of origin—than in the regions to which they are exported, the standard peppermint mints being the only flavour available and only stocked in relatively few stores. Callard & Bowser-Suchard manufacture and produce Altoids at a plant in Bridgend, Wales, although Wrigley, the brand's owner, announced in mid 2005 they planned to move Altoids' production to an existing plant in Chattanooga, Tennessee, in order to manufacture its products closer to where they are sold.
The history of Altoids dates back to the reign of King George III. The brand was created by a London-based Smith & Company in the 1780s but eventually became part of the Callard & Bowser company in the 1800s. Their advertising slogan has been "The Original Celebrated Curiously Strong (insert flavour here) Mints" for a number of years, referring to the high concentration of peppermint oil used in the original flavour lozenge. The "Story of Altoids" text is printed on the paper liner inside certain tins.
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Monday, May 3, 2010
Soldersmoke Podcast #124
May 3, 2010
Oprah follow-up: On to Martha Stewart and Dr. Phil?
Fencing on a Roman piazza
Breaking an important cable
My WSPR Direct Conversion receiver
Roger Hayward's wonderful ugly AF amp circuit
The beauty of SBL mixers
My DaVinci Code Oscillator goes on the air!
Making my own 555 timer chip (sort of)
LEDs as varactors (or are they colorful switches?)
Black Holes in workshops -- is the LHC to blame?
Altoids: now made in TENNESSEE!
G3RJV's wonderful video
MAILBAG
Saturday, May 1, 2010
Down For Maintenance
I hope to get the next podcast out as soon as I can. Maybe tomorrow. I will try to spare you all the gory details. Back to the radios! I've had a very interesting e-mail exchanges with Hans Summers G0UPL about LEDs as varactor diodes and their use in QRSS FSK systems. I'll talk about this in the next podcast.