BITX 5 Watter Makes the Trip to Tokyo

The solar flux index was only 151 this morning, but grey line conditions to Japan were very good.  Yoshi, JA1OJJ, was booming in on 17 meters.   We had a nice chat.  He said I was 55.  His 5 element quad helped a lot!   

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F6FEO's BITX 20 (and DSB Rig)

This morning I was looking at F6FEO's wonderful web site (Frank, KM4AXA is building the 28 Mhz DSB rig from Michel's site) .  The drawings have a nice JF1OZL feel to them.

Check out Michel's site.  Just hit the translate button if you have trouble with the French language:
http://f6feo.homebuilder.free.fr/index.html

Merci Michel! 



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MOXON Antenna Project -- Need Rotator Advice

 

 

I've been put together a fishing pole MOXON antenna for 17 meters.  It will be used with my 5 Watt BITX rig.  I need something to spin it around.   I know that many of the cheap TV rotators don't hold up very well.  I had one die quickly out in the Azores.  There seems to be several brands out there, but the rotators and the control boxes look suspiciously similar. 

 

Is there any brand out there that is more robust and reliable than rest? 

I came up with a pretty cool way of affixing the corners of the antenna elements to the fishing poles.  That coil-like thing is the wire part of a bungee cord.  It fits nicely into the end of the fiberglass pole. You have to be sure to get the pole length and the element dimensions properly proportioned, with a sufficient amount of bend in the poles.

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Fireballs Emitting RF at HF!

Yea, and that damn gamma ray bust static has been totally messing up the 12 meter band! Someone should complain to the FCC!

https://medium.com/the-physics-arxiv-blog/1382596c320d

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Some DX That You Can Never Work. Never.

There is some amazing info in this site. It is worth reading.

https://medium.com/starts-with-a-bang/the-disappearing-universe-d7447467c63a

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Pete Juliano's Enclosures

 

I'm sure many of you are, like me, impressed with the enclosures that Pete Juliano has been using with his rigs.   Here's an e-mail that he sent yesterday to Bert. 

Hi Bert,

 

You have a ready source of material right there in Seattle and they will cut it to size. Check out On-Line Metals. The transceiver project has a 4 x 8 inch base plate I bought from them and the front and back are pieces of single sided copper PC Board. The support material is 1/2 inch aluminum angle stock (Home Depot). Interesting use of round aluminum pillars. The front and back are stabilized using 1/4 inch threaded aluminum spacers that were fitted inside of small diameter hollow aluminum tube I bought in a hobby shop. A dab of Gorilla Glue holds the spacers inside the tubing and it forms a rigid support structure.

 

The subject of mechanical construction is a good one and perhaps Bill would like to cover that in a future podcast. That said I do have a bench top 3 axis manual milling machine and a 3 axis CNC milling machine (that one cost me about $250K). The cost was not in the machine but the cost of sending my youngest son to WSU where he got an ME degree. He designed and built the machine for me.

 

Boeing Surplus (now gone) in Kent used to sell aluminum plate by the pound and a lot of my stock (now all gone) came from there. As a retired Boeing employee I used to get a discount.

 

73’s

Pete

And here is a slide show illustrating Pete's technique:

https://onedrive.live.com/?cid=4f1e8c71e0d4f1dc&id=4F1E8C71E0D4F1DC%212607&Bsrc=Photomail&Bpub=SDX.Photos&sff=1&authkey=!ADzJ4SgPn5OzRqk


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Video of Pete Juliano's 20-40 Bilateral Rig

Wow, what a beautiful rig.  Nice work Pete.  Kind of eerie how we both chose the 20/40 combination after building 17 meter rigs. We'll have to talk more about this in SolderSmoke 162.  Soon!

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A Post Card from Paris

This arrived from Paris, from our friend Rogier, PA1ZZ KJ6ETL. "Men are like computers: one never knows what's going on inside."  But it looks to me like the OM in the picture knows EXACTLY what's going on inside that rig.  So I guess this is commentary on the perils of black boxes, and the benefits of an analog, discrete component, Hardware Defined Radio approach.    I'm with you Rogier!  Merci!


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Thought Provoking Comments from Bert, WF7I

 
Hey Bill. 

 I enjoyed the interview with Pete N6QW very much.  So many main points were covered and I kept nodding in agreement, especially some of the stuff about the ease of doing homebrew that we have these days.  Like you, or similar to you I'm guessing, I have memories as a kid staring at the pages of an ARRL handbook, saying "huh?"  These days almost any question can be answered with a Google (and if not, an appropriate book overnighted via Amazon).  You guys both nailed it too with the comments about the free design software that is plentiful and the cheap crystals (I still need to order some "bags" of these!).  When I started out it seemed crystals were a big expense.  I guess not so much now.  It's really a great time to be a homebrewer.

I was trying to think of more questions for him for the second half of your interview but most of what I could come up with was too pedestrian probably or already covered.  I am curious about amplifiers but I believe he's going to talk about that next anyway.  Nothing was said about using varactor diodes in VFOs (unless I missed it) and I'm a little curious about his experiences with them.  And whether he still uses air variables or not (and if he has an opinion on these more compact "polyvaricons", one of which is in the Hendricks version of the Bitx-20 I'm building).   It sounds like most homebrewers these days are pairing up their VFOs with digital architecture of one type or another for stability and the display.  I guess you can't argue with the price of some of the needed parts.  But like you I feel like I'm not wanting to jump into the complex digital too far, the simplicity and ease of understanding of the simple circuits is really refreshing and fun for me.  The moment you have to rely on software for something I feel that the project is lessened a bit, not as robust in a way, kind of like having to rely on cholesterol-lowering meds so that we can keep eating cheeseburgers (had to slip in a food reference somewhere).

Something else dawned on me a few weeks ago, soon after I'd built my 40m direct conversion rig ("mrad-40") -- does anyone consider the audience on the band they're designing for???  I'm only partly joking!  There are some rude and coarse dudes on 40m.  It takes a little bit of luster off the whole "first light" experience of a new homebuilt radio when you turn it on and hear some drunks arguing politics or making fun of a YL ham on another frequency!  Probably not a suitable question for Pete!

I also really enjoyed the FDIM edition.  As always, it's one of the best of your podcast series.  My favorite was the interview with the ham near the end, I think he was 2nd to last.  He seemed to really sum up the entire homebrew motivation and experience.  I don't remember his name offhand.  But his description of sitting there with store-bought radios and the sort of transactional nature of appliance operating ("telephoning strangers") perfectly describes how I felt about a dozen years ago.  I'd migrated towards DX chasing and 6m grid collecting but that too can get pretty stale after awhile.  I'm getting closer to having a station that is all home-built, but I'm not sure I'll ever sell my commercial rigs as he did (although it would free up money for more test equipment!).

Maybe one final comment for Pete or just in general.  Since I've been a ham I feel like there's always been this pressure to build/design something that is in some way "cutting edge" or new.  In today's landscape that would be along the lines of the FDIM guy turning an Android phone into a ham rig.  I'm wondering if others feel some sort of peer pressure to "push the envelope" in some way with what they're doing, to establish bragging rights of some kind or to somehow feel that what they're doing is important or relevant.  I've never been clever enough to succumb to this pressure and invent something ingenious!  And I find doing lots of software coding incredibly boring and I know I'm not very skilled at it. 

So...I guess the question or point is, should we all in some way as "responsible" hams feel obligated to break ground in some new technical aspect of the hobby somehow, especially as builders and homebrewers (and hams)?  In other words, should I be riddled with guilt if I decide to devote the rest of my life to building regens and not SDRs?  Do you know what I mean here?  There seems to be a mindset among some hams that the hobby was founded on experimentalists pushing the boundaries of what was known, and in some way we all carry that torch.  For me, I've always pretty much seen it as a hobby, and if it felt like work I didn't do it!  Any thoughts on that?

Bert WF7I

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El Peregrino (The Pilgrim) from Spain

Eduardo, EA3GHS, sent this to me.  It looks like a wonderful bilateral SSB rig for 17 meters.
They said they wanted a "daylight" rig (for a daytime band) because in Spain the religious pilgrims walk all day and are tired at night.  Hence 17 for Los Peregrinos!

http://ea3ghs.qrp.cat/peregrino.html



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Alan Wolke's GREAT Video on Transmission Line Termination

An outSTANDING Wave video from Alan!  Check out the comments from new hams on the YouTube page:  Alan has a real knack (!) for explaining technical material, and for imparting real understanding. 

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Harv's Minima

Good Evening Bill & fellow Solder-smoke friends,

 

Well, I’m following the pack. I began gathering items for the Minima Transceiver back in March 14. There had been a good bit of strong back-N-forth discussions on the Minima Blog about what works and what doesn’t work. Some circuit refinements had been agreed upon while other were left to individual preferences. So, I decided to just be silent an learn from the experts. As a result, I did several months of observing before I took the plunge. While my efforts are not nearly as aggressive as others, I decided to forge a much slower path to success.

In my own quirky way of doing things, I kitted each module, measured all the parts statically, laid out the components, and finally built & tested each assembly before going to the next.

As a result, the learning’s were great and the performance of each section equal or better than my expectations.

 

I went the Manhattan Style this time but,  I have purchased several sets of Minima PCBs to use in the future. As I see it, there is a lot more solder melting ahead.

 

Bill, building radios is NOT DEAD yet. That desire to get back to the golden days of home-brewing still lives on.

 

At the end of the Memorial Weekend, this is my current Minima progress…

 

·         Construction of all 3 Audio Stages now complete (see photos)

·         The Microphone Pre-Amp is now awaiting voice testing

·         Audio Amplifier and Final Amplifier have been tested together

·         The results of audio testing has been superb for all stages thus far

·         3 complete sets of Micro Relays have been order and I’m now awaiting their arrival

·         24 – various ferrite and powered iron cores arrived several weeks ago, these are the heart of the front-end RX/TX stages

·         100 - 20 Mhz. crystals have arrived and await characterization

·         25 - 8” Male to Male SMA Cables have arrived this weekend, will need to order 15 – 4” Male to Male SMA Cable Assemblies next

·         5 – 12” X 15” Copper Clad Boards have arrived this weekend

·         25 –J310 N-channel J RF Power FETs were ordered and arrived this weekend, these are used in the Mixer Stage

 

 

Final Audio Stage

 

 

Audio Amplifier Stage

 

 

Microphone Pre-Amplifier Stage (see microphone connector mounted at rear)

 

I’m ready to begin kitting the Side Tone Oscillator and RX/TX Relay Stages.

The largest and most intense modules are yet to be tackled.

The Bi-Directional Amplifier has 34 parts alone.  So far I have installed over 40 parts in the three modules I’ve completed…

I realize it is just a start but, I’m motivated to see this one project through to completion.

 

73’s & Happy Soldering

 

Harv -=WA3EIB=-

Albuquerque, NM.

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Contact Reestablished with ISEE-3 Satellite

http://spacecollege.org/isee3/we-are-now-in-command-of-the-isee-3-spacecraft.html


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SolderSmoke Podcast #161: Homebrew SSB: An Interview with Pete Juliano, N6QW

 

SolderSmoke Podcast #161 is available:

http://soldersmoke.com/soldersmoke161.mp3

26 May 2013

Homebrew Single Sideband -- An Interview with Pete Juliano, N6QW

-- Pete's background:  55 years in radio.  Boatanchors AND Arduinos. 40673 Mosfets.  Guitar!
-- A personal transition from CW to phone.
-- The importance of passing on "tribal knowledge."
-- What you need:  A library, tools, test gear and a junque box.
-- A new word in the homebrew lexicon:  Pete explains "noodling."
-- One stage at a time!
-- The attractiveness of standard circuit blocks (that work!)  
-- The importance of IF selection.
-- Building your own crystal filters is easier than ever.
-- Thinking (early) about the enclosure.
--VFOs, VXOs, and (gasp) Direct Digital Synthesis

Thanks Pete! 

Pete's Web Site:  http://www.jessystems.com/

Pete's YouTube Channel: 
 https://www.youtube.com/channel/UC4_ft4-oTdCMlWlL4XXHScg/videos


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Meteor Shower Tonight

If the skies are clear, and if I can stay awake, I'll be out there looking for the new meteor shower. 

But there is no real need to go outside.  David, EA1FAQ has an SDR receiver tuned to a radar frequency in France.  You can see and hear the meteors as they create a path for the RF.  Very cool. 
Thanks David:

http://www.ustream.tv/channel/live-meteor-radar

You can also listen for meteor pings here:

http://spaceweatherradio.com/

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Overheard at Dayton: Drake 2B Market Manipulation! (& Help needed with 455 kc IF can)

I received a very nice message from Preston Douglas.   Conveniently, he is an attorney, and I have asked him to stand ready to defend me in court should I ever be accused of manipulating the markets for Drake 2-Bs (and perhaps the market for SSDRAs). 

Can any out there help Preston with his SX-110 455 kc IF can?
 

May 20 at 3:38 PM

Hi Bill,

 

I enjoyed #160, even though I heard those talks, live at FDIM. 

I thought you'd be amused by what I overheard in the flea market on Saturday in Dayton.  I was looking at a Drake 2B and Q multiplier being offered by a lady who said they were her father's.  They looked to be in pretty clean shape, though of course there was no way to know what was going on under the hood.  She was asking $200 for both, and said she was open to reasonable offers.  Now, I already have a 2B and haven't found any need for the Q multiplier.  And I had flown out to Dayton from NY, so would have had to ship the pair of boxes home--probably should have bought them anyway and sent them home by UPS for that kind of money.  

 

Anyway, there were two other guys looking at the 2B.  One said to the other that these were among the best receivers of the tube era, but that the prices had become inflated by this guy who does the Soldersmoke podcasts talking up the virtues of the 2B.  Couldn't help smiling at that.

 

As to the Hallicrafters SX-110 on the repair bench.  Well, I worked out a deal with a professional tech guy to trade him my non-working HP 8640b sig gen for some bench time on the 110.  He found that the first IF  transformer that I was having so much trouble aligning was non-working.  He had no replacement, so he bypassed the whole transformer with a cap to get signal to the next stage.  This is, of course, not a satisfactory solution.  And nobody has that IF can to sell.  I did read on another radio repair guy's web site  that he, too, usually stops working on a set with a bad IF can because repair is so labor intensive.  

Frankly, I don't accept that.  I mean what's inside there?  A couple of coils and some open silvered mica leafs. So, I plan to remove the can, open it, and fix it.  According to the Internet, the built-in caps on these cans become defective and need replacement by modern capacitors.  Or, maybe a wire is broken off.  Before I do anything, I am going to see if that transformer is really unable to peak at 455.  Anyway, maybe I'll get some time to mess with this radio over the holiday weekend.  

 

One of the guys (or was it you?) recently said he builds 'em, makes a few contacts to prove they work, and then puts them on a shelf.  Then he builds another one.  It's like that sometimes.

 

PRESTON DOUGLAS

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

Latest Project: 17 Meter Moxon

17 Meter Moxon by AE6AC

That's what I have in mind.  I ordered four fiberglass "crappie" poles yesterday.  I have a tripod for the roof.   What should I use to spin this thing around?  A TV rotor is an obvious solution, but the last time I used one it didn't hold up too well.  There is always the Armstrong method...  

Here's AE6AC's site:

http://www.moxonantennaproject.com/ae6ac/ae6ac.htm


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SolderSmoke Podcast 160: Special Four Days in May (FDIM) issue

   

George Dobbs, G3RJV

SolderSmoke Podcast #160:

http://soldersmoke.com/soldersmoke160.mp3

Bob Crane, W8SX, was out at the Four Days in May event and did an excellent series of interviews with the guys who made presentations:
 

Harold Smith, KE6TI
    Many Ways To Homebrew
 

Chris Testa, KD2BMH 
     Battery Powered Software Radios:
   Having your cake and eating it, too
 

George Dobbs, G3RJV 
    The Classic World of the Regenerative Receiver
 

Gary Breed, K9AY 
     Why Does My Rig Have a Receive Antenna Jack ?
 

Craig Behrens, NM4T 
    The Great Arduino, JT65 and Rebels Caper
  High adventure with new radio paradigms
 

Dave Cripe, NM0S 
     PoW QRP

 
-------------------------------------
 
VIDEOS OF THE PRESENTATIONS ARE HERE:

http://www.ustream.tv/recorded/47599691


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Message in a Bottle -- Beacon in a Bottle

Wow.  Very cool.  Don't get hung up on the legalities or the environmental consequences.  Just enjoy the simplicity and the technique.   All the details are on this very nice Italian site.  Google will translate it for you, but the pictures and the schematic tell most of the story.  Bravi!   

http://air-radiorama.blogspot.it/

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

FDIM Midnight Mojo Ceremony (Tuna Tin 2)

Tyson Tuna Tin Two

An important message From Rex, 
Transcendental Titan of the Tuna Tin Twos:

 --------------------

Fans of the Ancient Sacred Relic,

If you have a little QRP rebel in you, like me, and are a fan of Ancient Sacred Relic, i.e. The Original Tuna Tin 2 transmitter, and all things housed in round metal containers usually designed for fish products and pineapple, and maybe cats if VERY thoroughly cleaned, then you might want to bring your Tuna Tin 2 rig to FDIM!

Around midnight, after the scrum leaves the FDIM Club night gathering, there will be a Tuna Tin 2 Midnight MOJO ceremony! THE one and only ORIGINAL Tuna Tin 2 transmitter will be on hand for this solemn occasion where major QRP MOJO is transferred from the Ancient Sacred Relic into the tuna can inductees in attendance. Admission is free but you MUST bring a MOJOee tuna can housed rig for entrance to the ritual.

NO rectangular or mint tin equipment will be admitted!! NO unaccompanied minors OR adults OR adults who act like minors will be admitted.

TT2 QRP MOJO will be transferred....FUN will be had.....PRIZES will be raffled off!

If you think you might like to be there for the Tuna Tin 2 Midnight MOJO ceremony remember to pack a tuna can or reasonable facimile (307 (3 + 07/16" diameter) industry standard 2 piece or 3 piece can) housed TT2 style rig in your travel bag!!

REMEMBER: NO rectangular or mint tin equipment will be admitted!! You must have a TT2 inspired rig in you personal possession to gain
admittance! NO exceptions!!

Respectfully submitted,
Rex  W1REX  The TUNA Tinman!
--------------------

 

I will not be at Dayton, but I might be able to lend my TT2 (seen above with Tyson) should some worthy radio amateur wish to participate in the midnight ritual.  Time is short, so if you are interested,  send me an e-mail explaining why you are worthy. 

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

HOMEBREW ETCHANT!

http://hackaday.com/2014/05/08/testing-the-efficiency-of-pcb-etchants/

This is great. We can add this to the list of kitchen and household products useful in our kind of projects!  Desitin for heatsink compound!  Breadboards for breadboards!  Now this!

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Parts Cost for BITX in India: $5 US (that's buying all the parts!)

I knew that in India you could build a BITX for a few bucks, but I thought that this cost estimate assumed a fairly well-stocked junk box.   Not true!  This morning an e-mail from Farhan points out that even if an Indian ham has to BUY all the parts, he can get all of them for the equivalent of 5 dollars U.S.:

"Less than half a cent per resistor, less than a cent per capacitor, two cents per npn transistor and 50 cents for the IRF510. We use 'tv baluns' and tap washers for coils."

And, from the original BITX design page:

 "The purpose is to address the need among Indian hams in particular for an SSB rig that is easily and cheaply built. My original aim was to keep the price under Rs. 1000. The current design brings the cost to well under Rs.300 (less than 7 dollars)."

Now, when you are talking to someone using a new $10,000 Yaesu/Icom/Kenwood rig, it might be a bit unkind to mention that your rig can be had for $5. 


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The Guy who Invented the LED

I'm a big fan of Ira Flatow's "Science Friday" radio program (recommended!)
This week, while digging through the archives, I found this gem:

http://www.sciencefriday.com/segment/10/12/2012/fifty-years-ago-a-bright-idea.html


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

Bert's EMRFD Direct Conversion Receiver

Very nice Bert.  Sounds great.  I like the pill bottle coil core.  Lew McCoy used them in his designs. I do think that air core coils do provide better stability than ferrites or iron powder.   I kind of like the SW broadcast background music.  I also like the internal 9V battery.  Glad to see someone else resurrecting an old DC RX project.  


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VFO for BITX 20/40

Here's the VFO I use in my BITX 20/40.   IF is obviously 11 MHz.   VFO normally tunes 3697-3859 kHz for 40 meters.  Switching in that 220 pf cap lowers the range to 3292-3189 kHz for 20 meters.  It workd very well.   The coil is wound on a cardboard tube from a coat hanger.  I will put this in the appropriate file on the BITX group site.    I like the 20/40 band combination:  Good DX possibilities on 20, with provisions (40!) for the low sunspot counts to come.

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Manhattan meets Hyderabad: Pad Pattern for my BITX 20/40

A rough guide to how I laid out the isolation pads on my BITX 20/40 board.   The copper-clad board is 8 inches x 11 inches (22 cm x 28 cm).  I just cut out the pads as needed using tin shears and scrap pieces of copper clad board.  Gorrilla SuperGlue is my preferred adhesive.  I will put this in the appropriate file on the BITX 20 yahoo group site.


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Our New Robotic Overlords

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Homebrew Blimp with paper-thin Arduino (Printoo)

More on Printoo (very interesting!):

https://www.kickstarter.com/projects/1030661323/printoo-paper-thin-flexible-arduinotm-compatible-m


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

Hackers Recover 1960's Moon Pictures

http://www.wired.com/2014/04/lost-lunar-photos-recovered-by-great-feats-of-hackerdom-developed-at-a-mcdonalds/

Thanks to Mark, K6HX, for alerting me to this wonderful project.   

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Pete Juliano's Bilateral Rigs (with videos)

 

Hi Bill,

 

I was finally getting around to reading one of the recent SPRAT’s and saw a photo of your magnificent BITX17. Congratulations! A tip of the hat to Farhan for that very excellent design and it truly is a design that has traveled the world and made a radio available to many who otherwise would not be on the air.

 

It is a very robust design as I scratch built one in 2005 (or maybe 2006) and just for fun socketed every transistor so I could try various devices. I even had a bag of 2N706’s dating back to the late 1960’s. They all worked except for the carrier oscillator where I just couldn’t get enough swing in the oscillator to correctly place the CIO on the filter slope. That I attribute to the junction capacitance of the 2N706. By far the lowly 2N3904 that I bought for 4 cents each worked the best. Back when I built this I was W6JFR. Adding the EI9GQ frequency stabilizer really added a nice touch to the radio.

 

I should also tell you that when I built the radio my intent was to uses a piece of single sided copper vector board for the main chassis. It was the weekend and I didn’t realize the piece I had was not  big enough for the project. So I took a piece of standard perf board and overlaid that on top of a piece of single sided copper PC board –AND hand drilled all of the holes – I went blind, cross-eyed and had a terrible hangover after consuming 6 beers in a short time span! See the photos below.

 

BTW I also built a 17M SSB transceiver using the bilateral amp stage from G4GXO as appeared in the SPRAT 128. That used a 4.9152 MHz IF and a 23 MHz Super VXO. In the case of the VXO I used 11.52 MHz crystals in the VXO and used a diode doubler to put the LO at 23 MHz. With the doubler –you get the bonus of 2X the frequency shift of the Super VXO. I also had made a custom set of crystals and used a small relay to switch those into the circuit and that essentially gave me almost the full SSB Band coverage. You can see that here

 

http://www.jessystems.com/morexcvrs.html

 

Also I have been using a simple bilateral stage consisting of a 2N3906 and 2N3904 and the results have been amazing. The latest work is a follow on to my shirt pocket transceiver and uses SMD components. See attached.

 

Here are some  videos of the latest –which is now a two bander 40 and 20M. (Originally it was 75 and 40M)

https://www.youtube.com/watch?v=0UlBX7aznnM&list=UU4_ft4-oTdCMlWlL4XXHScg and https://www.youtube.com/watch?v=Wa5WiUZ9KoY

 

Have fun – this is such a wonderful hobby!

 

73’s

Pete N6QW
 

 

 

 

 

 

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Clocks, CRTs, HV supplies: Eric has The Knack!

Nice interview by Jeri Ellsworth.  This fellow definitely seems to have the Knack.  At the end of the video he shows a high voltage supply that he is WEARING AROUND HIS NECK! 

Here's Eric's site: http://tubetime.us/


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A Worthy Cause: Help Save the ISEE-3 Spacecraft!

http://www.rockethub.com/projects/42228-isee-3-reboot-project-by-space-college-skycorp-and-spaceref

Here is an excerpt from the above website:


Our plan is simple: we intend to contact the ISEE-3 (International Sun-Earth Explorer) spacecraft, command it to fire its engine and enter an orbit near Earth, and then resume its original mission - a mission it began in 1978. ISEE-3 was rechristened as the International Comet Explorer (ICE). If we are successful it may also still be able to chase yet another comet.

Working in collaboration with NASA we have assembled a team of engineers, programmers, and scientists - and have a large radio telescope fully capable of contacting ISEE-3.  If we are successful we intend to facilitate the sharing and interpretation of all of the new data ISEE-3 sends back via crowd sourcing.

Time is short. And this project is not without significant risks.  We need your financial help. ISEE-3 must be contacted in the next month or so and it must complete its orbit change maneuvers no later than mid-June 2014. There is excitement ahead as well: part of the maneuvers will include a flyby of the Moon at an altitude of less than 50 km.

Our team members at Morehead State University, working with AMSAT-DL in Germany, have already detected the carrier signals from both of ISEE-3's transmitters.  When the time comes, we will be using the large dish at Morehead State University to contact the spacecraft and give it commands.
Thanks to Dave, WA8JNM, for the heads up on this. 
 
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AA1TJ Crosses the Pond with 10 milliwatts

From a Facebook Post by Mike, AA1TJ:

Made 7 contacts with this tiny transceiver on 20m CW today with an RF output power of 10milliWatts. Five were stations in Georgia (GA QSO Party). The 6th was a regular QSO with a guy in Mississippi.
I answered a DX station calling CQ at 2230Z. Hearing nothing in response, I sent my call sign a half-dozen times anyway. More silence. As I was reaching for the knob to QSY he suddenly returned my call! ...Carlos, CT1BQH northeast of Lisbon, Portugal (that's him in the second photo). I was only 329 on his end but we kept it going for three minutes!

FYI: the transmitter (top circuit board) begins with a 3.58MHz ceramic resonator VXO (a 2N706 from the early 60's). That drives a push-push frequency doubler built around another 1960's-vintage, 2N2644 (obsolete stock from atop Mt. Mansfield, kindly given to me by Rich at Vermont Public Television). On receive, the 7MHz energy is routed via a DPDT relay (the orange rectangle) to the sub-harmonic (Polyakov) mixer located on the lower board. One stage of AF amplification is provided by a 2N333 that came off the GE assembly line in November of 1958. The DPDT relay is keyed directly. On transmit the 7MHz energy feeds a second push-push frequency doubler to produce 10mW at 14MHz (all spurs -35dBc, or less, with only the output resonator). The relay also switches the antenna between the transmitter and receiver.
Gosh, that was fun!

CT1BQH

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Bert's Pititico (PY2OHH) Rig (Video)

Bravo Bert!  

http://wf7ihomebrew.wordpress.com/2014/04/13/a-listen-on-40m-with-the-1-transistor-pititico/

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

DSB Transceiver with Only 3 Transistors

Wow.  Looks like something Peter Parker would really like.  This one was sent to me by Stephen, G7VFY.  It comes from Japan:
http://www.cqpub.co.jp/hanbai/books/15/15061/15061_p.180-181.pdf

From this book:-

http://www.cqpub.co.jp/hanbai/books/15/15061.htm

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

"That 70s Show": Steve "Snort Rosin" Smith Restores a 70's era Tuna Tin 2

Hi Bill,

Your recent stories about your TT-2 and original TT-2 "mojo transfer" prompted me to resurrect my TT-2 'resto' project. 

The attached photos show my 70s era TT-2 obtained for $5 from a QRP-L member.  This is how I received it and you can see that it's almost a duplicate copy of the original, complete with 'phenolic' substrate PC board material and hand-scrawled traces. 

I have collected most of the components necessary to convert it to a look-alike of Doug Demaw's 1976 item.  I already have 1 or 2 of the proper Radio Shack RF chokes but lack one more to have the complete set and I'm about to grab some original Radio Shack 276-1617 transistors.  The rest of the missing/incorrect parts I can drag out of the ever expansive Snort Rosin junque box. 

By hand selecting the two transistors for max. power gain I hope to eek 300 mW out of the thing.

Anyway, hope you enjoy the shots and I'll send more when it's finished.

73.......Steve Smith WB6TNL
          "Snort Rosin"

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PY2OHH's New Super-Minimalist (11 Component!) QRPp Transceiver

Wow!   Check out the latest rig from PY2OHH, the Wizard of Sao Paulo,

http://py2ohh.w2c.com.br/trx/pititico/pititico.html


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Pete Friedrichs' Amazing Books, Projects, and Guests

H.P. "Pete" Friedrichs is the author of two books that belong on our book shelves: "Voice of the Crystal" and "Instruments of Amplification." http://www.hpfriedrichs.com/mybooks/mybooks.htm

This morning I got a nice e-mail from Pete.  He's been listening to the podcast.

His e-mail caused me to revisit his web site.  Lots of minimalist homebrew gold there!

Check out the collection of projects sent to Pete from all around the world by readers of his books: 

http://www.hpfriedrichs.com/guestgallery/guestgallery.htm

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

QRPp Model Planes

Michael, AA1TJ, alerted me to this very interesting hobby.  The video is really beautiful.

http://floatdocumentary.com/documentary

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

Parachutist's Helmet-Camera Images Falling Meteorite

Just because it is pretty cool.  Also, we like parachutes, meteorites, and Norway.

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SolderSmoke Podcast #159: Hamfests, Herring Aids, and Tuna Tins

 

SolderSmoke Podcast #159 is available.

 



http://soldersmoke.com/soldersmoke159.mp3

April 1, 2014
Vienna Wireless Hamfest
BITX Talk
W1REX speaks
Tuna Tin 2 Mojo Transfer Ceremony
After 38 years -- finishing my Herring Aid 5 receiver
Feedback, Phasing Dots, Rotational Sense, and Oscillation (or not)
Motorboating (when you don't want to)
Building my Tuna Tin 2 with parts from W1REX
On the air with Tuna Tin and Herring Aid
More Minimalist Meanderings:
An (Almost) All Altoid Crystal Radio!
Tek 465 dies (again) :-(
MAILBAG

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