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Saturday, December 6, 2014
SolderSmoke Podcast 169: The Colorburst Liberation Army, Arduino DDS and the Tradition of Ham Experimentation
SolderSmoke Podcast #169 is now available:
http://soldersmoke.com/soldersmoke169.mp3
-- 25 crystals "deployed" to new Colorburst Liberation Army recruits
-- OBJECTIVE: For now, just oscillation
-- Using the Reverse Beacon Network (when time comes to transmit)
-- W2DAB's Mighty Mite: trials, tribulations, triumphs (and karma)
-- Explaining the Mighty Mite (all 7 parts)
-- Minima IF evolution -- up to 25 Mhz?
-- Chuck Adams and "Experimental METH"!!!!!!!!!!
-- Different kinds of Arduinos
-- Si5350s and amateur experimentation
-- First menus, now KEYPADS!
-- The launch of Orion
-- N2CQR/HI Beach Portable DSB on 20
-- Video review: "The Wanderers"
EL CLA UNIDO JAMAS SERA VENCIDO!
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
Labels:
Michigan Mighty Mite,
SolderSmoke Podcast
Launch of the new Orion rocket
The Saturn V was, of course, far more impressive and beautiful. But the Orion is pretty cool. When I was looking at the drawings depicting the various stages of the spacecraft, that Apollo-shaped capsule brought back some deep memories. I was 10 years old when Apollo 11 launched.
A page from the scrapbook I made during the flight of Apollo 11.
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
Labels:
rockets,
space program
Friday, December 5, 2014
CBLA Field Manual
I'm starting to worry about a visit from Homeland Security. I found this on the blog of W6IEE. He blames K6FWT.
The CBLA has a Yahoo Group: https://groups.yahoo.com/neo/groups/CBLA/info
Up the revolution! Fight the Powers that Be!
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
Labels:
Michigan Mighty Mite,
minimalist radio,
Smith--Steve
Thursday, December 4, 2014
Another NY Mighty Mite Oscillates -- on 40! N2HTT (Video)
Inspired by all the talk of Mighty Mites, N2HTT put together a nice 40 meter version:
Details on his blog: http://n2htt.net/
Click on the video above to see and hear it in action.
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
Labels:
Michigan Mighty Mite,
minimalist radio
Tuesday, December 2, 2014
Manhattan Mighty Mite: "Rockin' the Big Apple on 3.579"
Dave W2DAB got his Manhattan Mighty Mite oscillating nicely! Hooray!
Check out Dave's report on his Mighty Mite adventure:
http://w2dab.bamford.net/
So far we have sent out 20 colorburst crystals. Already we have two circuits oscillating (not counting Pete's and mine).
CLA is on the march!
E-mail from Dave:
Dear Bill & Pete:
Thanks for all your help, I can joyfully announce the birth of my first Michigan Mighty Mite, Oscillating at the frequency of 3.579! Yes, Pete’s sage advice to flip the coil over was a great help and also my good friend from Vermont (A Michiganian by birth ). OK, so Bill… you remember your most embarrassing moments in home-brew? Well, here’s mostly what happened: I was reading the article I found online and somehow got 40 meters stuck in my head even though your colorburst was for 80 - So I build a 40 meter coil. When I realized my mistake I thought - well why not build two of these so I pulled out the Colorburst and put in a Norcal 7.040 and then built a new board with a new 80 coil oriented properly and the pic below is the one you see. Now I have two Mighty Mite’s that work, how great is that.
My next goal is to continue forward using Pete’s Build Something Video’s, so more fun to come.
I will post a video on my blog of the 80 Meter Colorburst Michigan Mighty Mite uttering it’s joyful tones, but for now I’ve put a lovely photo at the bottom.
Success is sweet when you hear the sounds of the beep!
Cheers and 73 Gentlemen
Dave
W2DAB
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VK5FJ's Open SDR Rig (Arduino and SI5351)
Morning OM's,
I've amassed the parts for my 12v Regen Rx inspired by a projects from VK3YE and an audio amp, using a pair of 12AU7's. I'll publish more about that soon on my blog.
In the mean time, I'd like to thank you guys for inspiration on the si5351 VFO in use with various projects. After we found the first articles by NT7S, we discussed that there are a lot of possibilities.
I've just finished my build of an Arduino controlled SDR transceiver prototype using the Si5351A.
See attached images. Lots of collaboration with Mark VK5QI and David VK5DGR. More at; http://openradio.net.au/index. php/OpenRadio_SDR
This week I'm tinkering with the LPF for 20meters. Puts out a whopping 20mW.
Everything is on schedule for the presentation using this SDR at Linux.Conf.Au next year. Got some coding to do to add I&Q for the SDR side over the summer break.
72, Kim VK5FJ
I've amassed the parts for my 12v Regen Rx inspired by a projects from VK3YE and an audio amp, using a pair of 12AU7's. I'll publish more about that soon on my blog.
In the mean time, I'd like to thank you guys for inspiration on the si5351 VFO in use with various projects. After we found the first articles by NT7S, we discussed that there are a lot of possibilities.
I've just finished my build of an Arduino controlled SDR transceiver prototype using the Si5351A.
See attached images. Lots of collaboration with Mark VK5QI and David VK5DGR. More at; http://openradio.net.au/index.
This week I'm tinkering with the LPF for 20meters. Puts out a whopping 20mW.
Everything is on schedule for the presentation using this SDR at Linux.Conf.Au next year. Got some coding to do to add I&Q for the SDR side over the summer break.
72, Kim VK5FJ
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
Labels:
Australia,
Parker--Peter,
Regens,
SDR
Monday, December 1, 2014
Building a Better Diode Ring Balanced Modulator (with Knack Karma)
So yesterday Pete and I were talking about Dave W2DAB's Michigan Mighty Mite malady. Dave is tantalizingly close to the joy of oscillation. Wizard that he is, I think Pete diagnosed the problem with his eyes closed from 3000 miles away. I sent Dr. Juliano's prescription to Dave this morning and expect the concrete canyons of Upper Manhattan to be ringing with pure 800 Hz tones as soon as Dave fires up his soldering iron.
Anyway, I then told Pete that I'd been looking through my bookshelf for something suitable for my 11 year-old nephew Sebastian. I found something for him, but I also came across a book that was too advanced for the young fellow: "The Master Handbook of Ham Radio Circuits." TAB Books, 1977. By "The Editors of 73 Magazine." Between turkey sandwiches I started looking through this book. I immmediately found an article of interest: "A Better Balanced Modulator." The author (unnamed) looks closely at the performance of our beloved and much-used diode ring mixer with dual trifilar transformers. He concludes that the unbalanced input and output coils (in the traditional configuration) detracts from the balance needed for optimum carrier suppression. He suggest the use of baluns at input and output (see above) and claims significant improvement in carrier suppression. Very interesting. (If anyone wants to dig into this, e-mail me.) There is also a very simple solid-state VFO circuit that promises phenomenal stability.
Anyway, I found myself trying to remember where this great book came from. Then I remembered someone sending it to me. A quick check of my e-mail revealed the source: Dave W2DAB sent it to me three years ago. Thanks again Dave!
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
Labels:
magazines,
Michigan Mighty Mite,
mixer theory
35% Off on Bill's Books
35 % off on "SolderSmoke" (the book!), "Contra Cross", and my new book: "Us and Them"
All available in print and e-book form here: http://www.lulu.com/spotlight/soldersmoke
Sale through Dec 3.
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
Labels:
book
Sunday, November 30, 2014
Graham G4UEK has THE KNACK
Thanks to Stephen for alerting me to the homebrew page of Graham G4UEK:
http://www.sandrock.org.uk/radiostuff/Rigs.htm
I really liked the description of his progress as a homebrewer, and the way he was helped by G-QRP, SPRAT and Ian G3ROO. FB.
Graham has a nice personal ham radio story:
http://www.sandrock.org.uk/radiostuff/Radio.htm
Thanks Stephen! Thanks Graham!
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
Labels:
Knack Stories,
SPRAT,
UK
Saturday, November 29, 2014
Ben's Mighty Mite -- IT IS ALIVE!
Ben KD9JNQ is the first of the Colorburst Liberation Army (CLA) recruits to get his Michigan Mighty Mite to oscillate. So he has been promoted to Colonel.
Ben writes:
Bill and Pete, thanks again for the encouragement!
EL CLA UNIDO JAMAS SERA VENCIDO
Ben
KD9JNQ
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
Colorburst Explained
http://en.wikipedia.org/wiki/Colorburst
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
Labels:
Michigan Mighty Mite,
minimalist radio
Friday, November 28, 2014
Bill's Dominican Mighty Mite (1993)
If you look closely, just in front of my keyboard you can see the Michigan Mighty Mite that I rebuilt this morning (scroll down to see the previous post). Looks like I was using a polivaricon as the capacitor. Other than the cap, all the parts used in this 2014 version were from the 1993 effort. Here is how it is described in "SolderSmoke -- Global Adventures in Wirless Electronics":
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
I decided to start off slow, with small
projects that seemed likely to succeed.
The secretary in our office in the Embassy, Mady Bullen, had an interest
in ham radio that had been sparked by service in far-off places where
short-wave was the only way to talk to home.
She would pass me old issues of CQ magazine.
It was in the March 1992 issue that I found the Michigan Mighty Mite.
It was originated by Ed Knoll, W3FQJ and developed by Tom
Jurgens, KY8I. It is
about as simple as you can get in a radio transmitter: just one stage, a
crystal controlled oscillator.
An oscillator is basically an amplifier in which some of the output signal is fed back
into the input. If you provide enough
feedback in the right way, the amplifier will “take
off” and begin generating a signal. The
howl you hear when the microphone of public address system gets too close to
the speaker is this kind of signal. The
speaker (the output) is sending energy back to the input (the microphone) and
what was an amplifier turns (annoyingly) into an oscillator. In this case it is an audio frequency
oscillator because all the filters and tuned circuits in the PA system are
built for the audible frequencies. But
the same thing will happen at radio frequencies. That’s what the Michigan Mighty Mite is all about.
I put the thing together using parts obtained from the Santo Domingo
Radio Shack store. The resonant circuit used a coil that was just some wire wound
around a discarded plastic 35mm film container.
Homebrew radio projects rarely work the first time you power them
up. I had to fidget with this thing
quite a bit—obviously there wasn’t enough feedback. I had my Drake 2-B on and tuned to the crystal’s frequency. As I poked around on the little circuit
board, I suddenly heard a little chirp from the 2-B.
There it was! The little device
that I had put together was producing radio frequency energy on the 40 meter
band. Hooray! The joy of oscillation!
Now I felt like I was truly in league with Faraday and Marconi, with Shep, Stan and Bollis, and
with Serge! Hilmar would have been proud of me (but he still would have been
horrified by my sloppy wiring).
I never was able to talk to anyone with that little device—the power
output was very low, and my antenna for the 40 meter band was very poor. But it didn’t really matter. I had had my first real success at
homebrewing a piece of ham radio gear.
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Bill's Re-Born 1993 ColorBurst Michigan Mighty Mite
So far we've sent out 9 of these color burst 3.579 MHz crystals. It occurred to me that I should make sure these particular rocks work with the Michigan Mighty Mite design we've been advocating. So today -- still in something of a turkey-induced haze -- I pulled out the surviving remnants of the MMM that I built back in 1993. That one had been for 40, so I rewound the coil for 80 using the data from this MMM site: http://www.qsl.net/wb5ude/kc6wdk/transmitter.html
I was hoping that this rig might oscillate even without the variable capacitor, but mine did not. Once the cap was placed in the circuit, the oscillations began. It sounds pretty good on my Drake 2B.
I have not yet wound the secondary (antenna) coil but (as I suspected) the oscillator works fine without it.
So, no excuses folks. These cheap junk box crystals work. Time to build one of these things and join the ranks of hams who have homebrewed a transmitter (and, of course, The ColorBurst Liberation Army).
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
Labels:
Michigan Mighty Mite,
minimalist radio
Wednesday, November 26, 2014
Colin's BITX is Receiving!
Wow, quite a bit of progress at M1BUU since our last look (see below). I must admit, that Arduino DDS board looks quite nice sitting there in the VFO territory. In his original BITX20 article Farhan recommends a pause before the construction of the final portions of the transmitter -- the builder is advised to sit back and enjoy the receiver that has just been created. Colin is at that point! Congratulations Colin. He has noted that his board is a bit(x) smaller than mine. Maybe he should stick with Farhan's recommendation and build the PA and driver on a separate board. This will also help prevent the dreaded oscillations -- no need to tempt fate or anger the radio gods!
Hi Pete,
Another great SolderSmoke episode this weekend, I really like the humour between you and Bill! I listened to SS whilst melting solder on my BITX project.
I'm so pleased to have got so far, and I'm very pleased with the build. That big copper clad board doesn't look so big now, but I think I have room for the TX/RX switch, BPF, RF driver, RF PA and LPF which I still need to add.
Thanks for the encouragement and advice so far, I doubt I'd be feeling so elated at this point without it!
This is going to be a really cool rig!
73, Colin M1BUU
Hi Colin,
Two words come to mind: Absolutely Superb! Wow that is such a work of art. I may never show another one of my projects as you have set the standard and benchmark.
You also have demonstrated building from the back end which we discussed in SS168. Now what you have built is a part of the test system.
Really outstanding. Be sure and video your 1st qso and share on You Tube.
Bravo!
73’s
Pete
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
Labels:
Arduino,
BITX20,
Farhan,
Juliano -- Pete,
UK
Tuesday, November 25, 2014
Pete Builds a Michigan Mighty Mite
We have been distributing quite a few 3.579 MHz crystals, but until today we hadn't seen a single new Michigan Mighty Mite. I commented on this in the last podcast. Pete came to the rescue and built one:
Hi Bill,
The MMM was built – took me a long time (about 30 Minutes so it was kind of slapped together). The most time was consumed drawing squares on the sheet metal. I used a pill bottle cut down for the coil.
Used a piece of Home Depot sheet metal for the based. I highly recommend a .01 Ufd from the 27 Ohm to ground –key clicks are awful.
BTW the circuit can be modified so that the tuning cap is soldered to one side of the coil and the other side to ground –essentially the tank tuning cap is in series with the 0.05 bypass cap and is effectively across the coil. Tribal Knowledge
The CLA lives on!
Pete
VIVA EL EJERCITO DE LA LIBERACION DEL COLORBURST! VIVA EL CLA!
Pete's Michigan Mighty Mite Manhattan MePad Noodle
New recruits have been signing up for the Color Burst Liberation Army. We have been sending out many more 3.579 MHz crystals. Pete Juliano was doing some noodling and came up with this plan for Manhattan pads or Me(Maine)Pads. All you need is some copper clad board, a pair of Home Depot tin shears and some super glue. Cut out the pads, glue them down, add components and get the Mighty Mite percolating.
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
FINALLY! A Computer Made with Discrete Transistors!
http://hackaday.com/2014/11/22/a-4-bit-computer-from-discrete-transistors/
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, November 22, 2014
SolderSmoke Podcast #168 Software Inefficiencies! DSB Blues! Schematic Errors! QRO Confessions!
SolderSmoke Podcast #168 is available.
22 November 2014
http://soldersmoke.com/soldersmoke168.mp3
The benefits of software inefficiency.
Don't throw a wet blanket on computer baby steps.
DDS-ing Pete's old boatanchors and Bill's BITX.
Bill's DSB amplifier woes: a JBOT unfairly scorned.
Getting ready for solar-powered beach DSB.
Michigan Mighty Mite Crystal Offer -- FREE ROCKS!
Tribal knowledge: Beware of mistakes in published schematics!
QRO update: Working Japan on 17 meters.
Happy Thanksgiving!
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
22 November 2014
http://soldersmoke.com/soldersmoke168.mp3
The benefits of software inefficiency.
Don't throw a wet blanket on computer baby steps.
DDS-ing Pete's old boatanchors and Bill's BITX.
Bill's DSB amplifier woes: a JBOT unfairly scorned.
Getting ready for solar-powered beach DSB.
Michigan Mighty Mite Crystal Offer -- FREE ROCKS!
Tribal knowledge: Beware of mistakes in published schematics!
QRO update: Working Japan on 17 meters.
Happy Thanksgiving!
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
Labels:
DSB,
JBOT,
Juliano -- Pete,
SolderSmoke Podcast
Friday, November 21, 2014
Tube Transmitter in a Cuban Cigar Box
Beautiful use of a cigar box by Ben, KK6FUT. Ben is working in close proximity to Pete N6QW and has obviously fallen under the influence of Pete's "Build Something With Tubes" field.
Watch out for the high voltage Ben. You aren't in Arduino-land anymore! One hand behind the back OM!
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
Labels:
Cuba,
Juliano -- Pete,
Tubes
Thursday, November 20, 2014
Impedance Matching Transformers -- Pete's Magic Decoder Ring!
We got some questions on this and Pete was kind enough to write up some notes on the topic. We may talk more about this during the next podcast (Saturday):
Broad Band
Impedance Matching Transformers.
Broad Band impedance matching transformers are designed to transfer power
over a wide frequency range. More basic you have an amplifier that has an output
impedance of 200 Ohms and you want to match that to a 50 Ohm load.
So what is the magic decoder ring so that you get a 4:1 match, ie going
from 200 Ohms to 50 Ohms. Getting technical for a moment the maximum power
transfer theorem says maximum power is developed when the source is matched to
the load. The Broad Band Matching
transformer enables that to happen over a wide frequency range.
So how do we get from 200 Ohms (the source) to 50 Ohms (the load)? Just as there are many
airlines that fly from LA to NY so it is with the matching approach. We will
cover several.
First a short discussion about broadband cores themselves. One of the most
common cores for HF work is the type 43 core which is good up to about 50 MHz.
For transformers up to 200 MHz then the type 61 are a better choice. Typically
at HF the FT -37-43 is one of the more common ones see (3/8 inch in diameter),
as is the FT-50-43 which is ½ inch in diameter. The iron powder cores are not the 1st choice
for broad band matching.
#1 Way:
Build a transformer that has a
primary of x number of turns (and since it is large, 200 Ohms will have
more turns) and the secondary will have y number of turns ( and since it is
smaller, 50 Ohms, will have fewer turns.) The transformer action is based on
the ratio of the Primary turns Squared to the Secondary Turns squared. Our
transformation is 4:1.
Thus if we divide the primary turns squared and divide it by the secondary
turns squared the result is 4. Here are some example: if we had a primary of 8
turns ( 64) and a secondary of 4 turns (16) – 64/16 = 4. So that is our transformer a primary of 8 turns and a secondary of 4 turns. When building
these transformers use two different colors of wire as that makes it much
easier to identify the windings. Observe the phasing, meaning the end you
connect to the collector of your output transistor is the start end. That same
start end for the secondary winding is the output “hot” side of the secondary.
#2 Way.
The same ratio holds in going from 200 to 50 Ohms. But this time we will
use a single winding of 8 turns and at 4 turns we will have a tap for the 50
Ohm point. Since that tap will very likely have Dc on it connect a 100 NF cap
at the 4th turn winding and this is the output. What you have just done is
create an auto transformer.
#3 Way.
At time one may have an oddball transformation and you can cascade
transformers and multiply their individual turns ratios. At one time I needed a
9:1 transformation. I built a 2.5 transformer and then hooked that to a 4:1 and
the result was a 9:1 transformer.
The attached table has “worked out” some common matches that are often needed
like matching a 50 Ohm amplifier to a 500 Ohm Crystal Filter which is a 10: 1
match. This is easily done with a 6 turn primary (50 ohms 6^2 = 36) and the
secondary has 19 turns ( 500 Oms 19^2 = 361). 361/36 = 10.03:1. Close enough for ham radio! The 1st way is probably more preferable for this
application.
Pete N6QW
11/2014
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
Labels:
Juliano -- Pete
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