Oz Tektronix ‘Scope Repair (in Juliano Blue)


Rob is a braver ham than I. When my Tek 465 quit, I tried to fix it, but quickly chickened out.
Very nice that he painted his in Juliano Blue.

Dear Bill and Pete,


I do enjoy your podcast, and I must present an offering to the “Gods of Homebrew”,
An on-line find of an old Tek 545 oscilloscope presented a chance to enjoy the warmth of 100+ tubes (once repaired)
The outside was heavily scratched, the inside looked like a chicken coup, but no major bits missing or broken.
Lots of cleaning, testing all tubes,(using the excellent uTracer tube tracer), replacing the broken 3, remounting the cooling fan, lots of reading about tube oscilloscopes, adjusting the trigger circuit, rebuilding 3 electrolytic power supply capacitors, sandblasting the cabinet and a coat of BLUE paint.
Voila, the joy of (visual) oscillation! (1MHz 2V p-p)

Rob VK5RC


Oz JOO : An Australian Mighty Mite with 3D Printing


Hi Bill & Pete,

I have the JOO – joy of oscillation! The transistor is a 2N3053 with a clip on heat sink, but I don’t think that I really need it. Output power +22dBm or 160mW. When I tested it on a Comms test set at work, I found that the harmonics were about 12dB to 15dB down and I stopped looking at the 10th harmonic. Not good.
Fitting the 80m low pass filter (salvaged from another project) brought the harmonics more than 50dB down.
The coil former is a 31mm diameter and 3D printed by one of the guys at work. The material is PET – the material they make soft drink bottles from. After we printed it, I put it in a microwave oven with a glass of water. 30 seconds and the water got warm and the coil former stayed cool.
I haven’t had a contact yet, but maybe in the next few weeks.
The next project is an 80m CW transmitter based upon the Goodfeller transmitter from QST 1946. It requires a inductor in the pi coupler, 1.5 inch diameter, 32 turns at 20 tip; but where to get one of those these days – wind your own.

I got the guy at work to also 3D print me a coil former with a spiral thread around the outside with a 20tpi pitch for the wire to lay in. Some hot glue and the coil is ready.
Now that I have finished all 189 episodes and two specials, my days are empty. Please make some more.
73 de Peter VK2EMU


Hi Peter (great name BTW),
Congratulations –really liked your build – top drawer! 3D printer access WOW – now if I could only get my 3rd son (Mechanical Engineer) to build me one of those machines.
The 3D made coil form is perfect for a VFO and follows the principles set down by Doug DeMaw W1FB (SK) about keeping the coil supported at both ends and away from metal. Bill needs a coil like that to mate with his HRO dial mechanism –and follows something old (dial) something new (coil).
73’s
Pete N6QW

Oz QRP2QRP From Mt. Bullfight, Pyramid Hill, and Melbourne’s Chelsea Pier


A Great Knack Story: Peter Parker Interviewed on “QSO TODAY” by 4Z1UG

I really liked Eric’s interview with the Peter “The Wizard of Melbourne Beach” Parker aka VK3YE. What a great Knack story! There he was, trolling the garbage dumps of Western Australia, looking for discarded electronics. Using the LO of one broadcast receiver to demodulate SSB signals coming in on another… Great stuff! Check it out:

http://www.qsotoday.com/podcasts/vk3ye

Alan Wolke W2AEW Builds a Michigan Mighty Mite (Video)

We are honored to induct Alan Wolke W2AEW into the Colorburst Liberation Army. And for his valiant effort to build and explain a MMM Low-Pass filter, he is immediately promoted to the rank of CBLA Two Star General. Congratulations General Wolke.

As is the case with all of his videos, this one has already had an impact far and wide. Ian writes from far-off Western Australia:

ZL2CTM’s New Zealand Double Sideband Success

New Zealand and Australia seem to produce an amazingly high percentage of the world’s double sideband transceivers. Charlie ZL2CTM adds to the count. He took inspiration and circuitry from DSB hams in both countries and produced this beautiful DSB transceiver. It is obviously — as Charlie notes — chock full of soul. I definitely identify with his comment about “taming some kind of electro-mechanical machine” and also, of course, with his remark about the feelings that come with putting a homebrew rig on the air. So follow the advice of Charlie! Build a DSB rig and put it on the air! Make this your ham radio resolution for 2016! Give it a go!


Hi Bill:
I have been following you and Pete Juliano for many years now, and thought I would send you a photo of my 40m homebrew rig that I finished yesterday. Hopefully, it will help encourage others to melt some solder and make their own rigs. The rig is based on ideas and designs from Eric Sears ZL2BMI, Peter Parker Vk3YE and of course Pete N6QW. The aim is to make the final version relatively compact so I can take it tramping/hiking here in New Zealand.
The VFO is an AD9850 being controlled by an Arduino Pro Mini. The output is amplified to provide sufficient drive for the balanced modulator. I was using a nice 1” OLED screen to show the frequency, but that generated a huge amount of noise, so I changed to a LCD. Changing frequency is simply a matter of moving the curser left and right then using the up and down buttons to change the number. Very quick and easy. I was contemplating a rotary encoder, but I find those always seem to skip and jump every now and then. Must be the way I use them…
The balanced modulator is a 4148 diode ring. I do have some SBL-1s lying around, but I thought I’d go with the discrete diode ring for something different. I’m using a standard electret mic and a simple single stage amp. The switch above that switches between phone and CW.
The PA is two stages; the first a 2N3053 and the second a BD139. At this stage it puts out just over 1W into a 50ohm load. I might look to add another stage and get that up to 3-5W.
The audio amp is a simple LM386. I am not running it hard out as per the datasheet as it generates quite a bit of high frequency hiss in that configuration.
Unlike Pete, I don’t have access to a milling machine to make squares to mount the components on. Instead, I use vero/strip board upside down and solder directly to the strips. This works really well for me on HF. I cut tracks with the twist of a small drill bit.
Last night I made two contacts with the rig. The farthest was 527km according to some well known mapping software. Both reports said the audio was ‘very nice’, which was great to hear. The receiver worked surprisingly well too, and I managed to hear stations in Europe.
As for user controls, you will notice that the pots, switches and plugs are all over the place. I did that to keep leads short. I like it as i feel like I am taming some kind of electro-mechanical machine to generate and receive RF.
Anyway, this little rig has a ton of soul in it and is really fun to use. There is something different about making a contact with a rig you built. I really encourage everyone to give it a go!
The next iteration will be a SDR using a Teensy. Rheslip over at Open Emitter has done some great work with that.
73s
Charlie
ZL2CTM

Peter Parker’s New QRP Book

The wizard of Melbourne Beach, Peter Parker VK3YE, has written a book about QRP. Check it out here.

Peter is a true QRP guru. His Beach 40 transceiver is shaking the ether from locations around the world. I am really glad that he put that Melbourne dock on the cover. That dock has been the test site for many of Peter’s amazing creations. The railing has supported many great antennas. So many wonderful YouTube videos have been recorded there. There really should be a plaque or something…

Peter’s book is available as an e-book from Amazon. Details on how you can get it are here”
http://home.alphalink.com.au/~parkerp/miniqrp.htm

Thanks Peter for this important addition to the QRP literature.

VK3ZZ’s Magnificent Rigs

Oh man is that beautiful or what? Thanks to Peter Parker for the alert. This is yet another reminder that Australia remains a bastion of homebrew enthusiasm and expertise.
This is the work of Ross, VK3ZZ. Read more about this rig, and the other creations of this Electronic Wizard (including an impressive AM rack), 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

Another Great Rig (and Video) from Peter Parker VK3YE

Peter Parker has a double dose of The Knack: Not only is he a great rig builder, but he is also a very skilled teacher. His videos provide really excellent descriptions of how he selects, designs, and modifies the stages that make up his magnificent rigs. You can learn a lot from these videos. Thanks Peter.

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

Another Great Rig (and Video) from Peter Parker VK3YE

Peter Parker has a double dose of The Knack: Not only is he a great rig builder, but he is also a very skilled teacher. His videos provide really excellent descriptions of how he selects, designs, and modifies the stages that make up his magnificent rigs. You can learn a lot from these videos. Thanks Peter.

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! An Award for QRP DSB! VK3YE’s 40-40 Award

Brilliant! Great stuff! Lots of fun!
Another great idea from Peter Parker, VK3YE.

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

VK2YAC’s Yard-long, In-The-Yard, Bidirectional, Backyard Si5351 Rig

Alf, VK2YAC, wrote to Pete thanking him for the inspiration provided by the LBS project that Pete and Ben launched via QRP Quarterly. Alf has obviously taken to heart Pete’s recommendation re using a BIG breadboard.

On his web page Alf writes: “Build your homebrew station and join the revolution, it’s lots of fun!” We’re with you Alf!
Alf has more great pictures of his BBR-40 rig and short descriptions of the sub-circuits he has used. Note Si5351 with Arduino Pro-Mini for BFO and VFO.

http://qsl.net/vk2yac/Page2.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

Greg W’s Australia-Finland Mighty Mite (VIDEO)

Greg is a VK6 Australian ham living permanently in Finland. He has been a SolderSmoke listener for many years. Greg sent a nice picture and a video of his VK-OH Mighty Mite. FB Greg!

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

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

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

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

Colin’s BITX DX From the Field

That has to be one of the best-looking scratch-built homebrew BITX20s. Pete and I agreed that it looks almost too good to take out into the field. But that is where Colin took it. His BITX was designed for Summits on the Air, and the radio gods rewarded him for his efforts with VK DX. Well done Colin!
Hi Bill and Pete.
Well it just worked out that weather was going to be bearable this morning but getting worse through the weekend. I’m really want to ramp up my SOTA score so I’m trying to get out as much as I can. I switched my plans to an early morning activation on one of the local hills. The hill, called Sharp Haw, is a little lump on the edge of the Yorkshire Dales, it’s not very high at all, but it is worth 1pt for SOTA.
The early morning time window brought the possibility of VK QSOs via long path on 20m. I looked at the VOACAP prediction for propagation and it suggested a peak at 0800utc.
I was actually late getting up, my alarm clock batteries have decided they’ve had enough. Despite the late start, I still managed to get on the air by 0725, hearing a strong Australian accent on the power up frequency of the BITX, 14.200, was a good sign.
At 0737, I was called by VK1DI. I had to turn the AF gain up, but sure enough, the signal was workable and we exchanged reports, 55 for him, 33 for me. Within the space of less than 20 minutes, I had 4 VKs logged, the strongest being VK3DET, giving me a 56. The other two stations were VK3CAT and VK2IO. I also worked an Asiatic Russian station amongst others.
I’m over the moon, I might even apply for my SSB thousand miles per watt wallpaper!
I still find it magical that 25 volts into a bit of 7/0.2 wire can transport your voice across 15,000 miles! Amazing!
73, Colin, M1BUU

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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

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

VK2SJA’s Minima in a Realistic DX-100 Case

Steve, VK2SJA, is doing to a Realistic DX-100 what I have been thinking about doing to a Heathkit HW-101. With this kind of encouragement, who could blame me for making a Minima-101? I’ve been planning on keeping the 6146s and all the final (and perhaps driver) circuitry.

Here is Steve’s very nice description of his project thus far:

http://www.hfsignals.org/index.php/UnRealistic_Minima

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