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Friday, April 10, 2015

Happy Cosmonautics Day! Yuri Gagarin Images (SSTV) from Space This Weekend

http://m0dcm.co.uk/?tag=sstv

From the ARISS Web Site:

http://www.ariss.org/news.html

Latest NewsApril 6, 2015

ISS Slow Scan TV Expected Weekend of April 11

In celebration of Cosmonautics Day, Russian ARISS SSTV activity is planned for the second week of April.

Cosmonautics Day celebrates Yuri Gagarin’s famous flight on April 12, 1961 becoming the first human to reach space.

The SSTV event is planned for Saturday, April 11, beginning at 10:00 UTC and continuing until 21:00 UTC. All transmissions will use the high resolution SSTV mode PD180. Transmissions will be at 145.800 MHz. If similar to past events, 12 different photos will be sent through the weekend with 3 minute off periods between transmissions.

To receive the images in real time, all that’s required is a 2 meter radio receiver and a computer to convert the receiver’s audio to image form. The software to do this is available as freeware on the internet at sites such as http://hamsoft.ca/pages/mmsstv.php.  Received images can be uploaded and viewed at the ARISS Image gallery found at http://www.spaceflightsoftware.com/ARISS_SSTV/index.php .

Those capturing images are encouraged to upload them to http://www.spaceflightsoftware.com/ARISS_SSTV/submit.php

Uploaded images may be viewed at http://www.spaceflightsoftware.com/ARISS_SSTV/

Please be advised that situational demands on crew time could result in postponement or cancellation of any ARISS activity. Please pay attention to the possibility of any change in scheduling.


Soviet Union-1965-Stamp-0.12. Cosmonautics Day.jpg
 
 
 
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

Thursday, April 9, 2015

The Slaughter of Inductors, Capacitors, and Crystals Continues...


 
Oh the humanity!  Pete Juliano has turned his digital attention to previously completed projects.  Perfectly fine rigs -- whose only crime was that they used LC or crystal (VXO) oscillators -- are now being ARDUINOED by the maniacal Dr. Juliano.  Not even Huff and Puffs will be spared.  This is like the French Revolution!   We hear that Pete has even mastered the art of cutting the square holes that are needed for his "displays," so there is no stopping him now.  

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

Wednesday, April 8, 2015

Termination Insensitive BITX Amps


 Back in 2009 Wes Hayward and Bob Kopski designed a termination insensitive amplifier block for use in BITX-like transceivers. Farhan urged me to use it.  The advantage of this design is that the input impedance stays at 50 ohms no matter what you hang off the other end.  That's very helpful, especially when you start trying to get specific impedances at the ends of crystal filters.   I'm planning on using this circuit in my next BITX.   This morning I was playing around with it in LTSPICE.  The "mirror" feature in that program is quite helpful when you are working on circuits like this!

Here is the article by Wes and Bob that describes this great circuit:
http://w7zoi.net/bidirectional_matched_amplifier.pdf

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

Sunday, April 5, 2015

Transcontinental Recording of My BITX 17



I had a nice QSO with Duke, NA1A, out there in Irvine, California on Sunday.  Duke has a deep interest in the quality of SSB signals -- he is part of the ESSB group.   So I was pleased when he said my BITX 17 sounded good.    He recorded a little bit of my transmission. Click below to listen to the BITX 17 tran-continental,  with some help from my CCI amplifier (120 W PEP) and my 17 meter Moxon antenna. 

Thanks Duke!

http://soldersmoke.com/Recording by NA1A.mp3


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

Chuck Adams' Secret Recipe for Muppet PC Boards (and lots of other homebrew tips)



A few days ago I shared an e-mail from John N8RVE on his re-build of the SW-40.   John used a "Muppet" board, Muppet being a combination of Manhattan and Ugly techniques.  But there is nothing ugly about it really.  I joked in the title of the blog post that the beauty of this technique is almost enough to get a homebrewer to abandon the Manhattan technique.  Now, I was born on Manhattan island, and I went to Manhattan College, and I have been using the Manhattan technique for many years, so there is a lot of homebrew inertia at work here.   But that SW-40 looked good.  John mentioned that Chuck Adams K7QO has a series of YouTube videos on how to make Muppet boards.   This morning as I waited for the bands to open up, I  decided to take a look. 

Wow, they are really great.  I couldn't stop watching them. I kind of "binge watched" the whole series. Chuck Adams is a really great teacher.  There are lots of great homebrew tips in those videos, and not just about the boards. I NEED one of those new G3UUR crystal testers, the version that also gives you ESR!  I WANT a laminator, an infrared thermometer, some Krylon clear, and pool chemicals!  And a harmonica reed tuner!

I've been sort of planning my next rig.  It will be a version of the BITX.  But having recently built two BITXs using the Manhattan technique, I kind of feel the need to do something different.  I am planning to use some different circuitry (termination insensitive amplifiers) and MAYBE an Si5351.  Perhaps plug-in filters.  But now I want to also move forward in terms of building technique.  I want to Muppet!

Thanks Chuck! 

Here is the link to part one of Chuck's excellent video series:
https://www.youtube.com/watch?v=O6AmT1trO60


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

Saturday, April 4, 2015

VK3MO's 20 Element Monobander for 20 Meters!

 

Ian VK3MO was booming in from Australia this morning. No wonder: he has a 5 over 5 over 5 over 5 array on a rotatable tower.  He can get a 3 degree takeoff angle with this antenna and I think I heard him say that he is working on another so that he can get a one degree takeoff angle. He was also using a using a Collins 30L1 linear.  Lots of soul in that old machine!
 
At one point in our QSO, I turned off my .12 kW amplifier.  He said I was still 58-59 with 3-4 watts. 
 
And Ian is a homebrewer!   He has built a number of transceivers and has another one in the works.  I told him about the BITX and he printed out Farhan's article (to read later).   He tells me that he has heard Peter Parker, VK3YE, on the air. 
 
In this QSO, Ian was using a modern commercial rig, but wouldn't it be great if we could get him to connect a homebrew sideband rig to that big antenna.  Go for it Ian!



More on Ian's antenna here: http://vk6ysf.com/vk3mo_visit.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

Wednesday, April 1, 2015

Our New Sponsor: HOMEBREW 4 U! 家釀的你


                                             家酿的你

As I mentioned in the last podcast, we've been in some pretty serious negotiations with a new sponsor that I think is going to bring some MAJOR changes to the podcast.

"Homebrew 4 U"  å®¶é‡€çš„ä½    is an innovative new company based in Fakeszuhow, China.  Up until now they  specialized in custom circuit board manufacturing, but they recently contacted us with an expansion idea that we found very interesting.  They have been listening to the podcast, reading the ham radio magazines, and monitoring the U.S. amateur frequencies (especially 75 and 40).  They noticed some things:

Most hams DO NOT build their own gear.... but many seem to feel vaguely guilty about this. They seem to react with unease when they encounter a ham using a homebrew rig.  They grow defensive and scornful.  The jealousy is quite palpable. Obviously there is an exploitable niche in those sentiments!

Many hams express a DESIRE to build gear but then follow-up and say they "have no time" (what with all the contesting, video games, NASCAR, and golf!) 

Other hams say that they really want to build their own gear, but don't know anything about electronics (even though they are Extra Class -- how did that happen?) and they don't really want to learn.

Some hams say they would really like to build their own gear but find parts of the process quite distasteful.  Like winding toroidal coils. Or reading schematics. And then there's all that soldering!  But they insist that in spite of all this distaste for actual building, they really DO want to join the ranks of the homebrewers.

So.... Homebrew 4 U is developing a FANTASTIC product line that meets the needs of these guilty, busy, knowledge-free, toroid hating,  solder-averse homebrew wannabes!

On April 1, 2016, Homebrew 4 U will roll out a line of GENUINE homebrew radios. To bolster their genuiness, they will henceforth be referred to not as radios but as "RIGS" (nice touch, don't you think?)  

Unless the buyers select the optional "really build" option (see below), each "rig" will be complete and ready to operate.  And here is the beautiful part:  it will be a genuine homebrew rig, BECAUSE the company is doing all their work in an actual HOME in Fakezuhow! Pretty great huh?  So you WILL be able to proudly announce on 40 meters that you are running a homebrew rig (Remember: rig, not radio!)

Each of the H4U rigs will share some common features, all designed to provide the proud buyer (I mean homebrewer) with opportunities to remind people that he is running a genuine homebrew rig:

-- They will drift a bit.  Not too much, but enough to provide you with the chance to mention that your "rig" is "homebrew." Prepare to be envied my friends! 
 
-- The frequency readout will be set up to put you automatically on "wrong" frequencies. 
Like 7.162.025 instead of the "correct" 7.162.000000000000000000000000000000000000.  Again, another opportunity to gloat. Pretty neat, huh?
 
-- The audio quality on SSB will be SUPERB.  EXCELLENT.  This will provide some wonderful opportunities to compare signals with the Enhanced SSB gang.  Yours will sound as good or better than theirs, and you can follow-up by telling them that you are using a Radio Shack electret mic element, a one transistor mic amp, and NO EQUALIZER.  They'll love it!

REALLY BUILD OPTION:   For those wanting to enhance the truthiness of their on-the-air homebrew experience, for just a few dollars extra, H4U will leave one part UNCONNECTED.  You will then be able to make that critical final connection (don't worry, it won't be a toroid, and the connection will be via alligator clips -- if you've gone this far we know you don't own a soldering iron!).  You will thus be able to tell your envious interlocutors about the happy day when you "finished" your radio.  I mean rig.  You know what I mean.

Pete is heading out to China this week to supervise the manufacturing (I mean the homebrewing).  Thanks Pete!  Skype in OM!

So remember, the roll-out is set for April 1, 2016.  Watch out Yaesu! 
  

 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

Tuesday, March 31, 2015

Almost Enough to Make You Abandon Manhattan: John's SW-40


Hi Bill,
 
You said you didn't mind if I sent you some of my finished projects so here is the latest.  I scratch built the SW 40 that I had previously built from a kit by K1SWL.  I always liked that radio, and thought by laying it out I would learn more about it.  In testing it out after I aligned everything I made a qso with Mike (K3WAS),and got a good report, and I didn't let out any of the magic smoke or sacrifice any chickens.  You gotta love this hobby. 
The rig tunes from 7.034 to 7.063, and I had about 2.3 watts out, but ran into some slight problems with instability at the end of the qso with Mike. The PA was getting a little hot, but with the excitement of having it work right out of the gate it really didn't matter at the time.  The board layout was done with express PCB, and using the toner method, placed it on the board.  Chuck (K7QO), has some great youtube videos showing the process. I have to admit I got more knowledge by laying out the board as opposed to manhatten construction, and came away with a better understanding of the radio itself. 
Now to build the case.  the board is 5.25 by 7.25 inches, and I may have to sneak one of my wife's alum cookie sheets to fabricate the case.  She doesn't bake till Christmas so it will be a calm summer.  I also made provisions on the board for a digital readout, but for now I just want to enjoy the rig as it is.

Thanks to both you and Pete for taking an interest, as well as the great job on soldersmoke.
73
N8RVE  John



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

Monday, March 30, 2015

Rocket Launch, 1969


Through Facebook, I have re-established contact with my fellow members of the Waters Edge Rocket Research Society.   That's me, age 10, hitting the button on a homebrew launch controller.

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

Saturday, March 28, 2015

SolderSmoke Podcast #174:Belthorn III, BITX20(-40), Parasites, Test Gear, Hamfest, SPRAT, Flares, BITX History



SolderSmoke Podcast #174 is available:

http://soldersmoke.com/soldersmoke174.mp3

March 28, 2015

Happy Arduino Day!
Pete's Belthorn III Transceiver (with cool color display)
Bill's BITX 20 (that used to be a BITX20/40)
AD9850 DDS added to Barebones Superhet
Jean Shepherd on Parasitic Oscillations, Obsession, and Madness
Simple Test Gear for the Homebrewer
Digital Oscilloscopes and their amazing capabilities
Dongles and other great stuff in SPRAT 162
The BIG St. Patrick's Day Solar Flare
VK6MV's Amazing Rhombic (+)
VK7XX (Dos Equis!)
A Bit of BITX History
Pete going KX3 QRO


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

Friday, March 27, 2015

March 28 is Arduino Day 2015!


Dave W2DAB alerts us to tomorrow's celebration of World Arduino Day.   https://day.arduino.cc/#/

Dave says the events often produce some interesting video. 

We will attempt to participate by doing something Arduino-ish during SolderSmoke 174, which is scheduled for tomorrow. 

Forza Banzi! Viva Arduino!

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

Wednesday, March 25, 2015

Teensy SDR Update (video)



I know this will have some of you thinking that I have been kidnapped or drugged or brain-washed (by N6QW!) or something, but the truth is I'm just being drawn in by that fascinating little color screen.  This is the beautiful work of Rich, VE3MKC.  He has also updated his blog and provided a very nice diagram and written description of all the I and Q action: http://rheslip.blogspot.ca/  Thanks Rich!

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

Tuesday, March 24, 2015

A Box Filled with DDS

 
I put this in a box this morning.  Arduino + AD9850 shield by Paul M0XPD and Kanga UK.  Code by AD7C.  One stage amplifier by Pete Juliano N6QW.    Useful as a VFO or a sig generator.  Thanks to all involved.
 

Note the cool translucent feet!
 
 


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

Monday, March 23, 2015

More on VK6MV



Last week during the big St. Patrick's day solar eruption/CME impact I (with the help of the radio gods) managed to work Roy VK6MV in Western Australia. (A video of Roy working QRP pedestrian mobile stations in the UK appears above.)   Could it  have been that that miraculous contact was ALSO my first ever homebrew SSB to homebrew SSB QSO?   I e-mailed Roy to find out.   Alas, it was not.  But OM Roy sent some interesting info on his station and especially his antenna.  Excerpts from his e-mail:  

Hi Bill

Thanks for the qso and the email.

yes another 'fadeout' but we have had many over the years haven't we ?
Things have changed a lot since 1963 when I had my first license as G3SML.
We came to Aus in 1977 with 3 sons and now have 24 Grandies 13 Grandchildren; 11 Great Grandchildren.

I liked the early Plessey IC's when they came out ~
Carry on with home brew and get that personal enjoyment out of it, it gives you a boost I am sure.  NO I was not on the home brew I was on the Icom IC740 which I bought about 5 years ago at the WA Hamfest it had a fault of jumping to different frequencies, etc. I could not find its intermittent fault at all, but on the internet a 'W' ham in your country posted the same fault with explanations etc,
and it cured it,

So I was on that Rig + a home brew linear pair of old 813's in Grounded Grid and  a Voltage doubler for the + 2 kv,  I could not get the smoothing caps for that voltage so got hold of 3 metal canned ones 800 volt, then got some plastic drain pipe to insulate the cans from ground & then put them all in series with equalising resistors,
and it worked.

Yes I was on the rhombic ~ amazing antenna for a fixed point to point contacts ~
why a rhombic you may ask well when in the Uk I used to work VK2NN [and others] Tom with his farm of rhombics his setup much larger, and I thought one day I would love to put one up. Eventually with our moving to Aus' then came down here with its 8+ acres the opportunity led itself to put one up, and as I used to work into Europe/UK a lot that direction picked. first I put one up a bigger one than now,  but it did not work that good.  Moral the longer you go the higher it needs to be
So a smaller version tried using the contours of the land at a height above sea level of 1260 feet asl helps. Using 12 gauge usa hard drawn copper wire   I needed winches and turnbuckles etc to pull it up, one end is on the 60 ft tower, the others on assorted Wooden Poles +
The termination R for the rhombic is a 3 element TH3 Tribander ~
think of it why waste power into a whopper of a Resistor ~
this is not my idea but came from ~ Nano VK6UN why not connect it to another antenna with how to do it came from now SK Les Moxon G6XN
a clever man how to make a balun out of old ferrite rods from transistor radios,

Will close now my half a dozen lines of text are expanding to much

Cheers have fun Roy VK6MV


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

Sunday, March 22, 2015

Vienna Wireless Winterfest



I had a good time at the Vienna Wireless Hamfest today.  I met up with Armand, WA1UQO, and we went through the hamfest together.   Here is what I picked up (and why):
Crystal Radio Kit (for my nephew Sebastian)
 

Homemade Solar Panel (because someone had taken the trouble to put this together )
Milliammeter Meter (because it was connected to the solar panel)

Drake Dynamic Microphone (because it is Drake)
 
A bunch of BNC connector cables (always useful)


Copper clad boards (thinking of the next rig)

A bunch of RG-174 coax (Belden is usually better, but sometimes you need flexibility)

Lots of Ferrite Beads (because of my recent suffering with oscillations)

A bag full of relays (I like relays)

10 100 ohm pots (great for balanced modulators)

Big copper ground stake and straps (because I need to reform in this area).

An ugly old tube type receiver (because I had a 5 dollar bill in my hand when the lady said "5 bucks!")  I tried to give this to Armand, but he wouldn't take it.

Some connectors for Arduino projects (I'm trying not to be a total Luddite).

Armand gave me three very nice crystal filters.   Thanks Armand!



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

Saturday, March 21, 2015

Kirk's Herring Aid, Tuna Tin, and Regen Adventures

 
Hello Bill!
 
Just a quick hello from MN to tell you how much I have been enjoying your podcast. Although I have "plugged" your stuff in multiple magazine columns over the years, I'm a bit late getting into the listening game. My current contract job has me doing a lot of driving, however, so I now have several years' worth of soldersmoke to enjoy.
 
Several of the most recent episodes have made it clear that we have covered some common ground in our amateur radio careers.
I was licensed in 1977 at age 15 -- a year after I built my Tuna Tin 2 :) The transmitter was a smashing success. I used it with my Tempo One transceiver, or at the electronics repair shop at a local National Guard base (where my mom worked as a civilian administrator). I would ride my bike to Camp Ripley (only 8 miles or so), and the guys in the signal shop would let me use the shop's Collins KWM-2 HF transceiver (and attached dipole). Other than my efforts, I don't think the KWM-2 got much use...
 
I, too, tried to get the Herring Aid 5 to work, with no luck at all. Listening to your podcast was like being in a time machine of sorts :) I wonder if I got the "sense" of the oscillator secondary messed up? I never did get that thing to make even a sound. I don't have it any longer. The same goes for the TT2. They got "lost" when I stored a bunch of stuff at my dad's place in-between moves, as did a home-brew 4-400A amplifier and a 6146B amplifier for my Ten-Tec Argonaut. Darn!
 
Don't forget about the matching VFO -- the Chopped Beef Slider (CB Slider), which was built into a chopped beef can, of course! I didn't build one, but as I recall it was a diode-tuned 40-meter VFO for the TT2.
 
Your "regen rage" and its subsequent easing was also amusing. I have had a love-hate relationship with those buggers, too, although mine was mostly love. You referenced Dave Newkirk's (now W9VES) 40-meter QST regen article in a podcast. I was fortunate enough to be a QST editor at the time Dave was in his "second residence." That guy forgot more about receivers than I will ever know, and he helped me tremendously in official and unofficial capacities.
I have attached a photo (above) of a multiband regen that Dave helped me build (he designed and dispensed wisdom while I built the radio). He took a schematic from a 1930s ARRL Handbook and tweaked it a bit, helping me add a VR tube, "more modern" tubes and a few other goodies. Just to be difficult, I sampled the tank circuit with a tiny-value capacitor and a high-gain MMIC amplifier so I could drive a frequency counter, which displayed the receive frequency as long as the tank was oscillating. It was fun, but it was difficult to isolate the digital noise from the counter, so I only really turned on the counter as necessary, or to calibrate a dial, etc. The chassis used to be an Eico audio signal generator... In the photo the Jackson Brothers dial and bezel/tuning scale isn't completely installed. After sitting in a box for 25 years, the regen still works but probably needs new tubes, as it's rather deaf :) Blasphemy aside, I'm moving on to solid-state regens...
 
I, too, just got a Rigol DSO. Wow, the "one-button" measurement is almost too easy.
 
I'm prepping my book, Stealth Amateur Radio, for release on the Kindle (and maybe other e-book formats), but it's available now from my website, www.stealthamateur.com.
 
Keep up the good work, Bill.

I'll be listening. :)

73,

--Kirk Kleinschmidt, NT0Z
  Rochester, MN

Editor, 1990 ARRL Handbook
Technical Editor, Ham Radio for Dummies
QST Assistant Managing Editor, 1988-1994
Ham Radio Columnist since 1989 for:
   Popular Communications
   Monitoring Times and now,
   The Spectrum Monitor (www.thespectrummonitor.com)
My book, "Stealth Amateur Radio," is now available from
www.stealthamateur.com and on the Amazon Kindle (soon)

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

Friday, March 20, 2015

American Radio History Site -- Lots of Radio Magazines

 
Hi Bill,

I wanted to leave you feedback on your podcast.

I love it!  Keep it up.  I travel quite often in my work and listen to
all your podcasts.

Since my early teens in the late 70's I started subscribing to
electronic magazines (which I have still keep all every issue).  I just
found a site that has all the old electronic magazines scanned and
posted for all to read.  What a resource!
http://www.americanradiohistory.com 
It has all the old Popular
Electronic Magazines, Radio Electronic Magazines, Modern Electronics,
Electronics Illustrated, etc, in pdf format. Information from the turn
of the century ...  Wow.  Back when radio hobbyists made their own
chassis for their valve radios.  Just google American Radio History and
it will be a top link.  You might want to share this link with your
friends, and listeners.

I have purchased your Soldersmoke book from Lulu -- Thumbs  up!! Great Book.

Thanks again for sharing your experience with radio and the knack.

Greg Self
N8YCB
ps:
I have always called  kluge -  KLOO-guh ..  and I don't know why. ;)


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

Thursday, March 19, 2015

Working VK6 Homebrew During the Big Solar Flare


There I was. 0900 UTC (0 Dark Thirty local),  the morning after the big March 17 St. Patrick's Day Coronal Mass Ejection Impact.  Solar Flux Index: 116.  A Index: 117!  I'd never seen the A Index that high.  When I got home from work on  March 17,  I had turned on the BITX 20 and heard nothing but white noise.  No signals.  Nada.  Zilch. So the following morning my expectations for 20 were quite low.  I tuned across the whole band, again hearing nothing.  But wait... there was one signal.  And he was calling CQ.  With an Australian accent.  VK6MV!  The only signal on the band.  I called him with my recently fixed BITX20 (with .12 kW amp) and a dipole.  No problem. We had a nice contact.
A look at Roy's QRZ page shows that he is a fellow homebrewer.  Clearly, the radio gods were making a statement here.   






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

Wednesday, March 18, 2015

Software Advice From the Brainwagon (Mark, K6HX)

I was really happy to get this encouraging message from Mark, K6HX.  Mark is a real wizard -- he has been deeply involved in the production of many of Pixar's wonderful animated films.  And his blog -- Brainwagon -- is always a good read.   Mark offers good advice for software and hardware troubleshooting. Thanks Mark!

Hey Bill and Pete:

Just finished listening to your latest SolderSmoke on my commute
yesterday, and thought I'd drop you a line to let you know that I'm
really enjoying the "dynamic duo" format that you've adopted.  Having
different ideas and different perspectives on the show, but with both
of you showing such great enthusiasm really makes the show a pleasure
to listen to.  (Incidently, your audio for this last podcast seemed
much better to me, a couple of episodes seemed to be plagued with much
different levels between Pete, who was booming, and Bill, who
frequently seemed to be quite low.  Whatever you did, keep it up!)

As a guy who does mostly computer/software engineering, I'm especially
liking Pete's continual, good natured prodding of Bill to get with the
program and use more gadgets like the Arduino, the AD9850 and the
Si5351.  :-)  But what's most valuable to me is when you guys engage
in the back and forth of debugging problems like your recent amplifier
feedback issues.  And what I realized (and might come as some comfort
to Bill) is that most of the skills which you guys have developed to
understand and debug radio projects apply equally well to software.

Stop me if this seems familiar:

If you want to learn to program, you do it by programming.  Pick a
simple project and try to get it working, then build on your success.

Don't try to learn it all at once.  Making a computer blink an LED is
a good start.

Make use of the resources of the Internet community.  Look at what
other people are doing, look at their designs, and enlist their help
when necessary.

Keep notes about what works and doesn't.  Make an archive of all the
code you write.  Examples that work can be helpful to create new code
that works.

Don't just poke the program with a stick, hoping it will work if you
prod it the right way.  Develop a theory of why it works, and test
that theory.  If the theory is not born out in practice, then don't
leave that code lying around in your program.

Don't get too wedded to your idea about why a program may not work.
Test your assumptions, even the ones that you are sure of.  Often
those hide the worst bugs.

Think about modularity.  Build simple routines/modules that you can
reuse to build bigger programs.

Build on the shoulders of giants: using tested modules of other people
isn't cheating.  But eventually you may need to understand what is
inside these black boxes, so keep working on developing your skills.

Share your enthusiasm with others, via the Internet, Youtube or social media.

-------------------------------------------------------------------------------------------
See Bill, you've already learned a lot of the lessons you need to be a
programmer, you just learned them all with respect to radios.  They
will serve you well if you decide to take the plunge into tinkering
with programming.  :-)

On some of the ham radio related Facebook pages, I've been a little
annoyed lately that so many hams seem to lament that "nobody builds
anything anymore".  Ironically, I suspect these are the same sort of
people who decided to pile onto Bill's amplifier project and skewer
him for its audio quality.  If we want more experimentation in ham
radio, we are going to have to tolerate a little more failed (or at
least, not totally successful) experiments.  But even beyond that, I
supect that there is quite likely more people (in absolute numbers)
doing homebrew now than in any time in decades.  It's an incredible
golden age for homebrew.  We have great books out like EMRFD, great
mailing lists, vendors to sell us amazing parts at incredibly low
prices, and the Internet to share and learn.  People like you two are
part of this.  What are all these complainers doing to get people to
build stuff?

I have to really thank you, Bill in particular.  While I've still not
gotten all the way to building my own transceiver, you got me back
into amateur radio, fueled my interest in beacons, QRSS, WSPR and
homebrew in general.  And Pete's approach to radio seems to be the
wedding of electronics and software that I find in sync with my own
ideas.  I look forward to doing more projects, and hearing about
yours in the weeks and months to come.

Well done, sirs.

Mark (K6HX)

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

Tuesday, March 17, 2015

Tony's Mighty Mite (Escape from the DARK SIDE!)



Hi Bill,

Thanks for the crystal for the mighty mite. I have been pretty busy of
late, but got a few minutes to take a first stab at a build. I am an
electronics neophyte, but learning every day. I am a convert from the
software darkside - software engineer by trade - and enjoying every time
I succeed in getting something to work! I am glad that the circuit is
forgiving because I grabbed what I had at hand to make it and it ain't
pretty by any means, but I have included a photo of the build as was the
deal and also a snapshot of proof of oscillation from my oscilloscope.
I'll do it up right soon and try connecting it to my arduino to send
some morse code out to the ether. Send you more pics when I make it
pretty :)

Thanks again - 73, AK4ZF
Tony Cekolin



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Sunday, March 15, 2015

Hank's New Rig



   
Pete, Bill:
Applied power to the 6C4 / 5763 transmitter for the first time today. I made RF. No smoke was released to the wild. Only issue is the load air variable cap is fully meshed at full capacitance and still not getting the dip on it. Need to root in the junque box for a 220 or 330pF silver mica and wire that in across the load cap. 
    As it is its putting out 2w. Listening on a general coverage receiver I'm not hearing any chirp or drift. Will build a low pass filter and have to interface in the power supply. Still have a few details to do such as labeling the controls but for the most part I just built a transmitter from scratch. Happy day at the workbench.
    Another fix is to redo the coax from the RX / TX switch. Didn't have any RG174 so I just grabbed a clipping of RG8X had laying around. Ugly but got the job done.   
    Thanks for all the help and encouragement. 
Till later
Hank Ellis K5HDE

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Saturday, March 14, 2015

Happy Pi Day! Scottish Moonbounce in 1965, Eddystone Dials



Somehow this seems appropriate for Pi Day (3-14).  I guess it is because the antenna is circular.
Thanks to David GM4JJJ for sending this to us.  There is no audio. Kind of fun to watch the lads struggle with the big antenna while wearing coats and ties! 
 
David writes:
 
Hi Bill,
    Just watched the video of the progressive receiver and immediately noticed the old Eddystone drive and dial. 
    My first general coverage receiver was an Eddystone 840C in about 1969 I guess, so it brought back fond memories. 
    I also had (much later) an Eddystone 770R VHF receiver, which I used to listen to transatlantic 50MHz on during the sunspot peak a couple of cycles ago now. That was before we were allowed to transmit on 6m over here. 
    Incidentally if you saw the recent film "The Imitation Game" about Alan Turing, you might have spotted the 770R in it, which was actually a mistake as the receiver was not produced until after the war. 
Now something to break your heart, and mine actually:


    This old rig which was given to me sometime in the 70's by another ham, was stored the attic of my previous house now used by my brother, and a couple of years ago I had to clear the attic of the "junk" that I had left when I moved out. I didn't have any more room to store quite a lot of things and I made the decision to take a few things that I never thought I, or anyone else, would need. They went to landfill. :-(
    As you can probably see there is an Eddystone drive and dial driving a VFO which originally had insulation material around it for thermal stability. I think it may have been mixed or multiplied up to 144MHz judging by the scale on the dial. Looking back now I should have tried to save it, but I just felt at the time it would just probably lie in my new attic until I departed and then someone else would have to throw it out.
    I don't know exactly who made it, I was given it by Andy GM3IQL(SK), but I vaguely recall him telling me that it was made by Fraser Shepherd GM3EGW(SK) who I did not know as he died tragically young, but was a brilliant constructor. It could equally possibly have been made by Jimmy Priddy GM3CIG, and I could contact him as he is still around in his 80's now. At least I had the sense to take some photos.
  Now a couple of semi related video material that I put up on YouTube.
This is a (silent 8mm) film made in the 1965s about the first moonbounce attempts from Scotland and Jimmy CIG made the film. My Elmer Harry GM3FYB(SK) is in it. 
Another one this time 1965 field day!
    Bill, I really enjoy SolderSmoke podcasts etc, I am returning to ham radio after about a decade, got the bug again....
    The KX3 is in the shack, and I have the parts here now to build a QRP WSPR beacon by Hans Summers also.
    I like QRP, having previously worked with George GM3OXX back in the 70's when we went out portable with wideband FM QRP 10GHz (3cm) gear using Gunn diode oscillators. Just a few mW and we could work several hundred miles with small 2 foot dish antennas in the right conditions over water by super refraction. The receivers were just mixers, no active RF amplifiers in those days.
I think the best I did was 322km with my 10mW from Scotland to Wales on 10GHz. A couple of decades I built up a real SSB transverter with surplus MOSFETs for 10GHz and with greater power (250mW) and SSB bandwidths I could work non line of sight paths on that band from home. 
    I also like QRO for such things as 2m EME (moonbounce) and am in the course of replacing my old 8877 W6PO design 1500W amp for 144MHz with an Italian manufactured LDMOS 1kW amp that is a fraction of the size and weight, who would have imagined a single solid state device would be able to do that at a price amateurs could afford?
   Anyway enough of my ramblings. 
   Hope you don't mind me taking up so much of your time, I will let you get back to whatever you have on your workbench!
73
David Anderson GM4JJJ
 
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Friday, March 13, 2015

Final Integraton And On-Air Test of the LBS Transceiver (Video) (FB!)



Very nice.  A beautiful and educational project from Pete and Ben.   I have to start putting "tune switches" in my rigs and ammeters in the bias circuits of my finals. 

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

Thursday, March 12, 2015

Pete Juliano: Homebrewing With Transistors SINCE 1953!


I knew Pete had a lot of experience with transistors, but I didn't realize just how far back this experience reaches.  Pete writes, "The March 2015 issue of QST  had an article about a 1953 transistor transmitter project which was really advanced technology since the transistor was only invented about 5 years before that time...  About 1953 at the age of 11, I built my first solid state audio amplifier using the venerable CK722 from Raytheon. The transistor did look a bit strange in that cool blue cube shape with a red dot on the side to identify the collector. What a joy and surprise to me that it worked the first time power was applied...  It  was the CK722 that in large measure started me on a life’s work and engagement in a wonderful hobby. That CK722 path also led me to designing and building a QRP solid state version of the Collins KWM2 which I call the KWM-4."  I asked Pete why an 11 year-old kid in 1953 felt compelled to build a solid state audio amp.   The answer is very cool:  Pete's father had introduced him to crystal radios at age 8.  Pete wanted an amplifier for his crystal set, but his dad was worried about him building high voltage tube gear.  So that's how Pete got his VERY early start with transistors.

We are really lucky to have Pete Juliano sharing his vast tribal knowledge with us.


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Wednesday, March 11, 2015

N9IZ's Steam-Rollered Indy Mighty Mite (Video)



Not even the U.S. Postal Service's Anti-Crystal Steam Roller can stop an intrepid homebrewer.  OM N9IZ got his Mighty Mite working and produced a really nice video and blog post on the project.  You can just feel the enthusiasm:  On the blog he writes:   "Everything was assembled on a bread board for trial.  I must admit to being overjoyed when I saw the visual waveform on the PowerSDR panafall display of my Flex-5000A main shack radio.  So much so, that I ran through the house calling for my YL, KC9TAH.  She was in the shower and thought I’d cut off a finger or something while in the mad scientist lair.  Much to her dismay, it was only a nasty CW signal emanating from the Flex speaker.  She did humor me by going out to see the marvelous project before asking me what I was going to fix for lunch."  FB OM!   
  
Bill
 
I thought you might like to hear that another MMM has been brought into the fold.  You might remember that the crystal you sent me was steamrolled by the USPS.  Believe it or not, it works!  Not sure the frequency is exactly spot-on, but who cares...it works!  I enjoyed it very much and made a youtube video of the testing process.  I also took pictures and posted it all to my webpage.  Most of my other projects have been more QRO in nature so I'm treading in uncharted territory.  We'll see how far that goes, but right now I'm loving it.  I have my issue of QRP Quarterly and plan to follow along in constructing the LBS project.  All for now from Hoosierland.  Hope you enjoy the blog post on my webpage.  73 OM.

DE N9IZ


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