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Thursday, January 8, 2015
W5USJ's AMAZINGLY BEAUTIFUL Mighty Mite
More beauty and technical details at his site:
http://www.w5usj.com/mmmassytest.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
Labels:
Michigan Mighty Mite,
minimalist radio
Wednesday, January 7, 2015
Goats, a Paraset, and a QSO with a Mighty Mite! (Video)
This is a really wonderful video, made even more wonderful near the end by the appearance of a Michigan Mighty Mite! Thanks Steve! Thanks Nick!
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,
Old radio,
video
Tuesday, January 6, 2015
Nick's BITX
Good Evening Gentlemen,
Pleased to report that, inspired by Pete’s help before Christmas, and innumerable comments by Bill over the last few months, I have a working BitX receiver strip – first light about 30 minutes ago on a short length of random wire but still heard a couple of Italian stations.
Followed Pete’s example and built each stage as a module, I used MePads, having noodled the layout, which is far from optimum, but did mean that I could tinker and, more to the point, test each section before I connected it together, so that starting from the amplifiers (Pete’s design), I was able to test the mixer after a bit of thought and then slowly work my way back through the filter, via the amplifier blocks, DBM, and back to the BP filter … Came together surprisingly quickly working as you suggested Pete, and nice manageable chunks too. I think about 2 hours for each module to noodle the layout, test it and document what I’d done.
Still lots to do, using a semi commercial BP for now as I need some bits that I’ve ordered to build a homebrew BP filter, the crystal filter isn’t optimised and just uses Fahran's suggested values, nothing is properly tweaked so far, but, it does work – thanks guys !!
I’ll follows Fahran's suggestion and tinker with it on rx for now, might build a VFO so it’s ALL discrete devices. Currently all 2n3904s except for the 2n3906 in the audio stage, and of course the Chinese DDS with an Arduino so I have followed the path that Bill set out a while back – it’s a little deaf against my FRG7 so far but tweaking the filter to match the impedances a little better will probably help, and the filter has a lot of ripple.
Next stage will be to build a microphone amp and test it on the Tx side, then tackle a small linear amplifier for it, I’ll stick to around 5 watts for now, and inevitably, I can see it being tinkered with in the course of time.
VERY pleased – thank you both for your help and inspiration
73s
Nick, G8INE
Hi Nick,
Congratulations – very nice looking and the other bonus of building it large the 1st time through is when you build the 2nd one –you 1) know the circuit works and 2) you can optimize the layout. I frequently said that I often build two of the same, learning from the 1st and applying to the second. See below. Version 1 was a larger board in comparison to the whole radio in version 2.
Bravo – in short order you should be making lots of QSO’s
Pete N6QW
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Labels:
BITX20,
Farhan,
Juliano -- Pete,
UK
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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, January 4, 2015
Who is this earnest young radio amateur?
Name that ham! Here are his comments:
This is vintage early 1960’s and my call sign at that time was K3???. One of my favorite rigs was the Johnson Adventurer which I built and had a 6AG7 driving an 807 –50 watts input. On the top shelf near the lamp is the screen grid modulator for the Adventurer. I was in tall clover.
On the bottom opening is a 40M CW transceiver I built – it had a 6CX8 MOPA—about 5 watts. The RX was a two tube regen.
Labels:
Marconi-Guglielmo,
Old radio,
radio history,
Regens,
Tubes
Friday, January 2, 2015
A Thatched Roof, Some Palm Trees, A Dipole, and a Homebrew Rig
Look at the drawing above. That is the banner logo of Rod Newkirk's column in QST magazine. For many years Rod regaled us with exciting reports on the activities of intrepid foreign radio amateurs, transmitting from exotic locations using ingeniously devised homebrew radio equipment. Look at the picture on the left side. See the palm trees? See the thatched roof shack with the dipole antenna? Well, that's pretty close to what it was like for me out on the Samana Peninsula in the Dominican Republic last month.
I set up the station under the thatched roof in this picture:
The red pins mark the spot:
Here I am, tuning the rig while looking across Bahia Rincon:
The rig was my Azores-built, oft-modified, NE602-based, ceramic resonator DSB transceiver with a recently added India-designed BITX IRF510 RF amplifier chain. A little article I wrote about the ceramic resonator VXO was featured in SPRAT 127. My antenna was a half wave dipole strung up in the thatched roof. Power came from 10 AA Batteries. So this was the Double A, Double Sideband, Dipole DX-pedition.
I had given some thought to building an SSB rig for this trip, but because of the efforts of Peter Parker, VK3YE, I felt compelled to take a DOUBLE Sideband rig with me to the beach.
Here is an old (2006) video on the rig. The power amplifier has been significantly modified:
Here is some more information on the rig, including a schematic for the receiver and the SPRAT article on the Variable Ceramic Oscillator:
http://www.gadgeteer.us/PORTABLE.html
Here is the log book for my contacts.
17 DECEMBER 2014
W1JPR PAUL MT. DESERT ISLAND MAINE
8P6AE (BARBADOS) COULD BARELY HEAR ME, BUT GOOD QSO
18 DECEMBER 2014
N4USA DAVE IN FLOYD, VA. FAIRS NET. (KK4WW.COM)
KE4UGF DON ALSO FAIRS, NICE GUYS. FUN CONTACTS!
KA4ROG ROGER NORTH OF ORLANDO
19 DECEMBER 2014
WB2HPV GUIDO TALKING TO ITALIANS EVERY MORNING FROM WAYNE NJ. HE HAD TROUBLE HEARING ME.
CONDITIONS SEEMED POOR, BUT I WAS HEARING AUSTRALIAN STATIONS
W8GEO GEORGE IN THE INTERCON NET. HEARD ME.
ALSO ON INTERCON: KA4AOQ AND 6Y5MP (JAMAICA) ALSO HEARD ME.
N4PD PAUL
W3JXY/4 NAT IN KEY WEST
N1FM TOM, NORTH OF MIAMI SOLID QSO.
KM4MA PAUL IN ORLANDO WITH MARITIME MOBILE NET.
20 DECEMBER 2014
NA2LF LLOYD IN NY
WB8YWR JIM IN DALLAS
KM4MA.
W1AW/3 IN MARYLAND (TOOK ME A WHILE TO GET HIM)
21 DECEMBER 2014 NICE 4 WAY SPANISH LANGUAGE QSO:
KI4PZE MIGUEL
CO8OT JUAN IN SANTIAGO DE CUBA
WA4RME RAFA IN CHARLESTON S.C.
C08KB MARCO IN CUBA
Here is a short video showing the station and the location. Note the little birds (Golondrinas or Swallows) flying by. They nest in the thatched roof. They often got confused and flew inside the house. Billy and Maria rescued many of them. Whales breed in this bay in January and February. There are also manatees. It is really a beautiful place.
There were obviously other attractions (!) so I didn't spend a lot of time on the radio -- just a half hour or so every now and then. But it was really very satisfying to carry this little homebrew device with me, set it up in this amazing place, and use it to send my voice across mountains and hundreds of miles of ocean. I built this rig in the Azores and have used it in the UK, France, Italy and the Dominican Republic. It contains circuits devised by members of the British QRP club and by my friend Farhan in India. The ceramic resonator circuit is something I cooked up on my own. The microphone is from my old Sony Walkman and the pen that serves as its support is from that wonderful magazine "Electric Radio." In short, there is a lot of soul in this little machine. And it was a lot of fun to take it to the beach.
Thanks to Elisa for finding us this wonderful place. And to Rod Newkirk and QST for the DX inspiration.
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
Thanks to Elisa for finding us this wonderful place. And to Rod Newkirk and QST for the DX inspiration.
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:
BITX20,
Dominican Republic,
DSB,
Farhan,
magazines,
Parker--Peter,
QRP,
SPRAT
N2HTT's MMM Makes Contacts (the little rubber feet are important)
- LED tx power indicator, and
- little rubber feet
Of all of these, I cannot sufficiently emphasize the importance of little rubber feet. A project just cannot be considered complete without them.
More pictures and details of the low pass filter are on my blog at http://n2htt.net
I've had a lot of fun with this little rig, it's a keeper.
Keep up the great work with the podcasts, and Happy Holidays
73
Mike N2HTT
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
Thursday, January 1, 2015
Larry's Mighty Mite
Larry's rig looks like it is almost ready to go for Straight Key Night! FB. I was glad to heat that the crystal survived the rough treatment dished out by the US Postal Service these days. Apparently all envelopes are sent through a steam roller! Who knew?
As usual life has intervened in my plans, but after a delay for professional and personal reasons I can now report success in yet another additional the the CLA. I was able to successfully transmit into a dummy load yesterday with my new transmitter. It is not the prettiest device I have ever built but it is functional. I tried the home made mepad construction and it works fairly well. I did discover a few things while building and testing this unit. First, I need a new soldering iron with a little better temperature control. Second, before using this transmitter on the air (currently on a dummy load), it needs a low pass filter. I can see several harmonics imposed on the generated signal.
The first picture show how everything is mounted to piece of scrap wood for stability. I even screwed down the old key for stability during testing. The alligator clips are for the dummy load connection (the dummy load is also home built from 20, 1K ohm resistors which is located just on the right edge of the picture).
Even without an antenna I was able to receive the transmitted signal on my IC-7200 in the shack.
The signal on the scope is messy but the tome received on the IC-7200 sounds good.
Next steps are the additional of a Low Pass Filter and better matching to the dummy load (currently I'm only at about 49 Ohms).
Thanks again for the encouragement. I plan to do a little more tweaking on this unit and will keep you updated on any progress.
Have a great holiday and a Happy New Year,
73
Larry
AE7TMOur 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
Mac's Mighty Mite
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 30, 2014
Sputnik 40 Launched from MIR in 1997
Bill,
I'm new to SolderSmoke, and have made it up to episode 135. around episode 130 you entered a "space" phase that I enjoyed. With Sputnik being mentioned, I thought I would send you a recording of Sputnik 40 that I made on November 23, 1997. I used a home made turnstile antenna and an HT.
73,
Jeff Tucker
W9TLT
I'm new to SolderSmoke, and have made it up to episode 135. around episode 130 you entered a "space" phase that I enjoyed. With Sputnik being mentioned, I thought I would send you a recording of Sputnik 40 that I made on November 23, 1997. I used a home made turnstile antenna and an HT.
73,
Jeff Tucker
W9TLT
Listen to Jeff's recording here:
Sputnik 40, also known as Sputnik Jr, and Radio Sputnik 17 (RS-17), was a Franco-Russian amateur radio satellite which was launched in 1997 to commemorate the fortieth anniversary of the launch of Sputnik 1, the world's first artificial satellite. A 4-kilogram (8.8 lb) one-third scale model of Sputnik 1, Sputnik 40 was deployed from the Mir space station on 3 November 1997. Built by students, the spacecraft was constructed at the Polytechnic Laboratory of Nalchik in Kabardino-Balkaria, whilst its transmitter was assembled by Jules Reydellet College in Réunion with technical support from AMSAT-France.
Sputnik 40 was launched, along with a backup spacecraft and the X-Mir inspection satellite, aboard Progress M-36 at 15:08 UTC on 5 October 1997. A Soyuz-U carrier rocket placed the spacecraft into orbit, flying from 1/5 at the Baikonur Cosmodrome in Kazakhstan: the same launch pad used by Sputnik 1. Progress M-36 docked to Mir on 8 October, and the satellites were transferred to the space station. At 04:05 UTC on 3 November, during an extra-vehicular activity, Sputnik 40 was deployed by cosmonauts Anatoly Solovyev and Pavel Vinogradov.
On 4 November, the day after it was deployed, Sputnik 40 was in a low Earth orbit with a perigee of 376 kilometres (234 mi), an apogee of 382 kilometres (237 mi), an inclination of 51.6 degrees, and a period of 92.13 minutes.The satellite was given the International Designator 1997-058C, and was catalogued by the United States Space Command as 24958. It ceased operations on 29 December 1997 when its batteries expired, and subsequently decayed from orbit on 21 May 1998. The backup satellite remained aboard Mir, and was destroyed when Mir was deorbited on 23 March 2001.
Sputnik 40 was launched, along with a backup spacecraft and the X-Mir inspection satellite, aboard Progress M-36 at 15:08 UTC on 5 October 1997. A Soyuz-U carrier rocket placed the spacecraft into orbit, flying from 1/5 at the Baikonur Cosmodrome in Kazakhstan: the same launch pad used by Sputnik 1. Progress M-36 docked to Mir on 8 October, and the satellites were transferred to the space station. At 04:05 UTC on 3 November, during an extra-vehicular activity, Sputnik 40 was deployed by cosmonauts Anatoly Solovyev and Pavel Vinogradov.
On 4 November, the day after it was deployed, Sputnik 40 was in a low Earth orbit with a perigee of 376 kilometres (234 mi), an apogee of 382 kilometres (237 mi), an inclination of 51.6 degrees, and a period of 92.13 minutes.The satellite was given the International Designator 1997-058C, and was catalogued by the United States Space Command as 24958. It ceased operations on 29 December 1997 when its batteries expired, and subsequently decayed from orbit on 21 May 1998. The backup satellite remained aboard Mir, and was destroyed when Mir was deorbited on 23 March 2001.
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:
France,
Russia,
satellites,
space program
Sunday, December 28, 2014
Jean Shepherd Meets Lee DeForest (video)
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:
Jean Shepherd,
Old radio,
radio history,
video
Saturday, December 27, 2014
Colin Gets His BITX Receiver Going
Pete and I congratulated Colin on the First Sigs heard by his BITX (sort of like First Light for a telescope.) He is clearly following the advice offered by Farhan in the original BITX20 article: Take a break when the receiver is done; sit back to enjoy the sounds of success. I told Colin that having a small error in the build, then finding it and fixing it, well, that's icing on the cake OM. This also shows the benefit of having an oscilloscope. Here is Colin's report:
Hi Pete and Bill,
I really enjoyed the latest SolderSmoke! I think you two have got a winning formula, humour interspersed with valuable technical knowledge. Some podcasts are just too serious, there's nothing wrong with having fun in your hobby!
Progress is slow here, as always, but each week I have managed to move a little bit further forward. This week I aligned my BITX band pass filter and made a rough measurement of my crystal filter using the DDS signal generator that I built last week.
My oscilloscope is a Tektronix 465, older than me I believe! Of course there is no fancy signal level readout like the modern digital scopes, so I had to just peak the injected signal through the crystal filter and measure the frequency using a frequency counter connected to the IF amp. I followed the BITX ver 3 build instructions and my results seemed to match very closely to the Indian kit. I'm going to set my BFO at the -20dB from peak level as suggested in the ver3 instructions, I guess I can fine tune the setting later.
At first I had no signal making it out of the last RX IF amp, I traced the signal right through to the base of the first transistor but then the signal was lost. I had thought that band conditions were poor when I tried my BITX in RX last week when in fact it turns out that I'd made a small mistake building the IF amplifier that follows the crystal filter! I had wired the 4k7 resistor in the wrong place! I made the circuit good and hey presto, lots of signal coming out of the amp!
I was eager to give the receiver another try. On Fridays work finishes at 1pm, so a great chance to try out my rig during daylight hours. I hooked up the rig to a random piece of wire and I was amazed by the great noises coming from the speaker! I hadn't even set the BFO but voices were just leaping out. Man that rig has a lot of AF gain! I obtained a switched 10k log pot which I intend to use for power on and AF gain so hopefully the volume control will be OK. As a side note, it was nice to hear HF0YOTA down in the CW portion, I'm guessing that it is youngsters on the air station, I must do a search on the call later.
73, Colin M1BUU
So the little signal generator has already earned it's keep. I guess I can would have been scratching my head for a while without 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
Labels:
BITX20,
Juliano -- Pete,
test gear,
troubleshooting,
UK
Friday, December 26, 2014
Some Colorburst QRP Encouragement from ND6T
Don ND6T has been helping us come up with a good simple low pass filter for the MMM (Steve Smith and the FCC insist). At the end of one of his e-mails, he shared this QRP Colorburst gem:
Be prepared to be occasionally amazed. Back in the late 70's I worked all over the western U.S. with under 1/2 watt. Regularly. Even a QSO with a UA0 (Siberia) with under 1 milliwatt, he having answered my CQ! I was seeing if I could "get out" using a single "D" cell flashlight battery that was too weak for the flashlight. All using a colorburst crystal. Oh, and a dipole 100' high stretched over a creek.
73/72,
Don ND6T
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,
QRP
Thursday, December 25, 2014
Fwd: CBLA is on the air
Hi Bill,
No contacts yet but it sounds good into a dummy load. HA!
My plan is to put the whole thing up at the antenna and run the keying leads into the shack. Not shown on the pill bottle cap is a 9V battery connection. At 9V I get about 100mW out. With out the LPF and using 12V I can get about 1/2 watt. Total cost of the project? $0.00
Thanks again for the inspiration to heat up the soldering iron once more.
73's
Jim.. WA7HRG
No cost! That's the HB spirit! I like the LPF and that pill bottle modular construction is very cool.
This is the perfect time of year for CBLA operation on the QRG.
73 and 3579.......Steve Smith WB6TNL
"Snort Rosin"
CBLA # 1
Wednesday, December 24, 2014
From New Zealand - Roadkill Routers
Hi Andrew,Now that is what I call "cost effective". It works so why not!Good show.73'sPeteSent: Tuesday, December 23, 2014 7:15 PMTo: Pete JulianoSubject: Re: Thanks for the heads up on the Si5351Thanks for the heads up regarding the SMA connectors and cables. I will definitely do that. Will probably use my first Si5351 as a network connected signal generator and get another Si5351 module to put "on the air".FYI - rather than using Arduino (or some other microcontroller) I have been using recycled ADSL routers for my Si5351 and MEPT beacons. DLink DSL-502T specifically. These were the standard broadband router down here in ZL about 5 years ago but are now essentially free on the local auction site because everyone wants WIFI. They can be flashed with OpenWRT (a Linux derivative). They have enough GPIO pins that with a bit of configuration can easily control the Si5351 and other I2C devices.Bill talks about "road kill computers".... these are "road kill routers" but at $1 each you can't really go wrong.73Andrew ZL1WJQ
Tuesday, December 23, 2014
VE7BPO's QRP POPS IS BACK!
We were all understandably concerned when Todd VE7BPO announced this Fall that he was taking down his beloved QRP POPS web site. I'm pleased to report that Todd has transitioned from Web Site to blog. The spirit of QRP POPS lives on here:
http://qrp-popcorn.blogspot.com/
There are also links on this blog to all the great stuff that was on Todd's site:
Three cheers for Todd! Hip-hip...
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
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:
Canada,
Gale -- Todd,
web sites
Monday, December 22, 2014
Now in Santo Domingo
I wrapped up my Samana HI9 operation yesterday morning. I found a very friendly Spanish-language round table - they were all willing to try to pull my QRP DSB sigs out of the noise. Within a few minutes I worked KI4PZE, CO8OT,WA4RME,and CO8KB. So that made a total of 18 solid contacts with 3 more that might not qualify as full-fledged QSOs.
We have moved on to very urban Santo Domingo - no room for antennas 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
We have moved on to very urban Santo Domingo - no room for antennas 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
A Very Simple and Stable VFO
From the November 1964 issue of 73 Magazine, by way of a compendium book sent to me from New York City by Dave W2DAB, comes words of wisdom about how to make a simple, super-stable VFO. Lots of great ideas in this article. My favorite was running the thing off D cell batteries and leaving it on all the time! The article was written by Roger Taylor, K9ALD.
Here is the article:
http://archive.org/stream/73-magazine-1964-11/11_November_1964#page/n11/mode/1up
Thanks to Dave, Roger, Wayne Green and the Internet Archive.
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:
Green -- Wayne,
magazines
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