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Many thanks to SWLing Post contributor, Dan Van Hoy (VR2HF), who writes:
It was one of the most sublime moments in my 55+ years in radio. Almost every night I listen to shortwave station, KNLS in Anchor Point, Alaska, from my home in Hong Kong. KNLS broadcasts to Asia and the Pacific in English, Russian and Mandarin. The English broadcast is an amazing mix of secular and Christian music and topics, science, current affairs and more. It has something for both the seeker and the saint and is one of the most informative and entertaining shows on radio.
On this particular Monday evening, August 3, 2020, I tuned in late to the English broadcast from KNLS at 1000 UTC, but went on to listen to the remainder of the show. To my complete surprise as the show closed I heard “73 de K9ZDK” in Morse code and quickly wrote down that callsign. I assumed it was the engineer on duty, obviously a ham, having a little on-air fun with a big transmitter and antenna.
A few minutes later, I also heard “CQ de K9ZDK” at the beginning of the Russian program at 1100 UTC. So, I looked up K9ZDK on QRZ.com and found it was Zavier, a young ham who had become a silent key in June of 2019.
Zavier Klingensmith (K9ZDK) Silent Key
A little more online sleuthing and a phone call later revealed that his father, Thomas, KL0K, was at the controls of KNLS that night sending Zavier’s final CQ and 73 on this planet with at least 1 million watts of power (ERP: 100KW TX + 10dBd TCI curtain array) all around Asia and the Pacific. His call on CW was heard on every English, Russian and Mandarin show that evening over 16 hours of broadcasts (two Continental 100 KW transmitters). Wow!
In Zavier’s memory, Thomas has created a DIY kit for an Iambic Keyer and is offering it for FREE (though you might want to send some $$ for his production and mailing costs…my suggestion) to anyone who asks. Details can be found at Thomas’, KL0K, QRZ page. Maybe one of the first things you can send when your keyer is completed is,”K9ZDK de YOUR CALL, 73 OM!”
Thomas, our thoughts and prayers go out to you and your family. Thanks for the amazing on-air tribute to Zavier. I suspect he was listening with a big, big smile!
Many thanks to SWLing Post contributor, Bruce Atchison, who shares the following guest post:
What is Lightning Scatter DX?
by Bruce Atchison (VE6XTC)
Believe it or not, it’s possible to receive distant FM stations during a thunder storm. While lightning makes it difficult to hear AM and shortwave broadcasts, its crackles aren’t as evident on the 88 MHz to 108 MHz band.
When lightning strikes, it temporarily ionizes the air around it. Radio signals are reflected by the charged gasses and come back down to earth.
From my experience with this kind of DX, the signal became noticeably stronger during lightning strikes. This effect lasted for a second, then the signal level dropped to its former strength.
While a thunder storm raged overhead on July 7th, I used my CC Skywave SSB radio to check out the FM band. Instead of hearing E-skip as I had hoped, I found that tropo-like conditions reflected stations down to my home. I heard signals from a hundred miles away or further.
As just one example, I found a low-power station with the call letters CKSS on 88.1MHZ. They call themselves 88.1 The One. Find out more about this station at the http://www.881theone.ca/ link. It’s located in the town of Stony Plain, Alberta. This station plays country music and airs local news events.
At a guess, I’d say the transmitter is about 120 miles from my QTH in Radway. It normally doesn’t come in at all. The signal strength varied too, showing that it wasn’t a local.
In my instance of catching CKSS’s signal, a form of tropo ducting was also present. Rain can produce reflections of signals but it’s much more pronounced in the UHF and microwave bands.
When a thunder storm is ruining AM and shortwave reception, try DXing the FM band. You’ll be surprised at what occasionally comes in.
To see a demonstration of lightning scatter on amateur TV, watch the
following video:
To hear what FM lightning scatter sounds like, watch this video:
Thank you for sharing this guest post Bruce. I’ll be the first to admit that I’ve never tried to hear lightening scatter DX, but I will certainly give it a go. This time of year, we’ve numerous thunderstorms in the afternoon and evening, so I’ll certainly have the opportunity!
Post readers:Have you ever caught FM DX off of Lightening Scatter? Please comment!
Many thanks to SWLing Post contributor, Frank (ON6UU), who shares the following guest post which expands upon his previous DB4020 article:
The EA3GCY DB4020 transceiver now has CW mode
by Frank Lagaet (ON6UU)
After telling you all about the DB4020 SSB build I’m here with the CW part of the kit, let’s say this is part 2. At a certain moment Javier let me know the CW interface kit was ready for shipment and some week later it was delivered to my QTH.
Again, a well packed kit arrived in a brown envelope, components and boards well packed in bubblewrap. I found even a board I did not expect which can hold a push button, a switch and the connector for your morse key. Javier thinks of everything it seems!
Unpacking the bubblewrap gave me this result, all components in 2 bags. In the bigger bag another 2 bags with 2 printboards, one for the CW interface, one for the CW filter. Great !! Checking the material bill resulted in all components there, another thumbs up.
I started, of course, immediately building it because I wanted CW in the transceiver as soon as possible. I don’t do much in SSB mode anymore and I already started missing CW on the DB4020, so I started my KX3 to listen to while I was populating the boards. I never thought CW was going to have this impact on me! …. ..
I started building the CW interface, again starting with all small items. I soon saw that the 2 relays which need to be soldered in were ideal to protect all components when the board is upside down, so I soldered them in very quickly. I then soldered in all other components ending with the elco’s.
Next phase was the CW filter. This board is small and came together in a blink of an eye, no problems there, the long legs of the 3 and 4 pin headers went in last.
The following day, I made all wire connections and soldered a 13pin connector, leaving one pin out since I want to have the option to choose the width of the CW signal I’m listening to. By cutting the FL CW + pin and adding an additional switch, I have now 500Hz or 2400Hz. Great option, for very little effort and simple. Another thumbs up here.
Now it was simply a matter of inserting the sub boards in the main board and all should be working. And it did! Hurray! The 500Hz filter works perfectly, filtering away all above or below stations nearby my operating frequency.
This is the result of the soldering work, 2 small boards which need to be inserted in the main board:
The CW interface still needs the 13pin header of which I cut one pin and mounted a switch to have the 2400Hz width.
The IC you see in the middle of the CW interface is the KB2 keyer which gives you several functions like 4 memories and beacon mode. The 4 potmeters are used to set the level on 40 and 20 meters, to set the delay between TX and RX switchover and to set side tone monitor level. The keyer also provides functions as keyer mode A or B, straight key function and can be set for speeds between 1 and 50WPM. WPM speed can be set in 2 different ways. Handy!
Here a picture of the CW filter inserted on the main DB4020 board.
The CW interface is inserted at the side of the main board, notice the 2 wires which go to the switch to allow switch-over between 500 and 2400Hz.
(Wiring still needs to be cleaned up in this picture.)
Finally, the result: a good working multimode QRP transceiver with 2 bands. It should be possible to make close to medium range with it as well as DX, even with QRP power.
And while I was building I also made a new key for this radio, it is made out of a relay and cost nearly nothing, looks good doesn’t it ? hihi.
Homebrew key
The key, when in practiced hands (fingers hi), can do 50 WPM without a problem. My friend HA3HK does without blinking an eye at 40WPM with this kind of key and tells me that he can go faster if needed. Me? I’m going it a bit slower.
Battery pack
As this radio is only using little power (0.4A in RX, 1 to 2A in TX depending the power you set it) I thought, let’s make a battery pack for the radio.
The first plan was installing it in the box. I did not do that because the batterypack is also powerful enough to feed my KX2 and other QRP transceivers. Since I can use it with all of them, a loose battery works out better for me.
I started with an old laptop which had a broken screen and some other malfunctions, but still had a good battery, although I needed the battery connector of course. A piece of wood to mount the connector on was my next goal. And since I still have another laptop using the same batteries, I can charge the battery without problems. Simple, but good and it weighs much less than a gel cell battery.
The battery provides me with 12.5V and some 5Ah. Enough to last for hours on RX and for sure good enough to activate 2 SOTA sites in one day. It doesn’t look great but works great– that is what matters and to test it was more then good. Next will be getting the battery pack in a nice box. Better to re-use stuff than throwing it away I’m thinking.
I need to do something about the cover of the OLED display, there is still some work there to make it look nicer.
Some video can be seen on YouTube :
Finallym I’d like to thank you all for reading my articles about the DB4020. I had big fun soldering, tinkering with the box, making the key, and batteryholder/batterypack. My Hungarian friend HA3HK told me it looks a bit like a spy radio. …. ..
I also include one more time the link where you’ll find this kit :
Thank you so much, Frank. No doubt, you had a lot of fun putting this excellent little kit together.
Implementing a filter switch was a fantastic idea and, obviously, not terribly difficult to do.
Based on the videos, the DB4020 has a low noise floor and very good receiver characteristics. I’m impressed that the CW portion of the radios has so many features as well, such as a memory keyer and beacon mode.
I also love how you reused that 5Ah laptop battery! I think that could almost give you a full day of SOTA activations at those consumption levels!
Thanks again for sharing this with us, Frank! We look forward to your future articles!
Many thanks to SWLing Post contributor, Brian D. Smith (W9IND), who shares the following announcement:
W9IMS: A delayed start for the Indianapolis Motor Speedway special event station
by Brian D. Smith, W9IND
It’s a late start for auto racing at the Indianapolis Motor Speedway, as well as the amateur radio station that honors this century-old tradition … but the show must go on!
And this week it will, as special event station W9IMS returns to the airwaves from now through Sunday to offer radio hobbyists a fresh opportunity to collect more “wallpaper”: Two vivid racing-themed QSL cards and the popular certificate known as the Checkered Flag Award.
The 2020 certificate will be easier than ever to earn. Normally the Speedway’s three major races take place on three different weekends, but this year, because of Covid-19 concerns, they’ll be consolidated into two. Accordingly, hams and SWLs will be required to contact or tune in W9IMS during only two race weeks – the current one, which continues through Sunday, July 5; and Aug. 17-23, which ends on the day of the venerable Indianapolis 500.
Even if you succeed in snaring W9IMS only once, you can still send off for the corresponding QSL card. All certificate and QSL designs are new each year.
The coming Independence Day weekend will feature an unprecedented racing doubleheader, with the IndyCar Grand Prix and the NASCAR Brickyard 400 slated for Saturday and Sunday, respectively. Consequently, the first W9IMS QSL of 2020 will be a full-color, four-sided card portraying images from both races.
So where do you find W9IMS? The station will stick to three bands, 20, 40 and 80 meters, and may appear at any time of day or night from now through Sunday.
However, the best bet is to catch the station during prime time – 2200 through 0200 UTC on weeknights (6 to 10 p.m. Indy time). W9IMS operators also plan to activate 20 meters during daytime hours, often between 8 a.m. and 2 p.m. (1200-1800 UTC); and will cover the various bands all weekend starting at 10 a.m. (1400 UTC) daily.
If you still haven’t caught W9IMS by the time Sunday evening arrives in Indianapolis, operators commonly conduct their own happy hour – working stations in rapid contesting style – right up to midnight (0400 UTC Monday).
Here are a couple of hints for tracking down the station during special event weeks:
Go to the W9IMS web page (www.w9ims.org), find the “2020 Operating Schedule” heading, and click on the link to “Grand Prix & Brickyard” or “Indianapolis 500.” Although some W9IMS operators get on the air at unscheduled times, you’ll have your best luck looking for the station during the hours and bands reserved with a name and a callsign.
Check DX Summit (www.dxsummit.fi) for spots that identify the current frequency (or frequencies) of W9IMS, if any. And if you type “W9IMS” in the search box, you can customize it to show reports for only that station.
For additional details, consult the W9IMS web page. Feel free to submit both of your 2020 QSL card and certificate requests in the same envelope, and if you don’t have your own QSL card, a printout of your W9IMS contacts or reception reports will suffice.
Many thanks to SWLing Post contributor, Frank (ON6UU), who shares the following guest post:
Building EA3GCY’s DB4020 QRP Transceiver kit
by Frank Lagaet (ON6UU)
In May, I discovered via a newsletter that a new kit was available from Javier EA3GCY in Spain. I was immediately sold as this was a kit from my favourite kit producer and it has 2 bands–it will also be able to do CW and there also will be a CW filter.
After building 2 MFT’s from Javier which work without problems, I needed to have the DB4020. The MFT’s are for 20 and 40 mtrs and do DSB (double side band). I did put them in a not-so-graceful box but they do what they are intended for which is QRP phone (SSB). They came together without problems so I expected the same for the DB4020–I knew for sure when I saw the board: all through-hole components (except for some capacitors which are factory soldered) and a lot of space on the board. The board has been silk-screened with clear indications on where all components have to come and the manual has very clear instructions where each component has to be soldered with referral to a quadrant. The manual provides a 252 quadrant page so it is a piece of cake to find where each piece goes.
What do you get?
Javier provides you with all components which need to be installed on the board and, of course, the kit board. The components come in small marked plastic bags and all is well-wrapped up in bubble wrap. The board is wrapped separately and that is put together with the component wrap which is then again wrapped up in bubble plastic. All goes into an envelope. Very well packed I must say.
Here’s a picture of the bags with components:
The silk-screened board:
I started with the resistors since that’s the easiest way. After that, I did the capacitors. I like to solder in all flat components first, so next were the diodes and IC sockets followed by the elco’s. The transistors were next together with all relays. As you solder in the transistors one also has to mount the cooling heatsinks, these cooling sinks are high and are ideal to protect the coils one has to make, they also protect the polystyrene caps (which I always find vulnerable) when the board is upside down.
Many kit builders are afraid of winding the toroids in kits–don’t be! It is easy. Just take your time and follow the instructions given by Javier in the construction manual. In this kit the builder has to wind 8 toroids: 6 are a single wire which goes through the toroid body, 1 is a toroid with 2 different windings, and 1 has a twisted pair which goes through the final toroid. Be sure to measure the wire you need per toroid as instructed in the manual. Javier gives some spare, so you can be sure. You will also see that on next picture where the legs of the toroids have not been trimmed yet. Once done I still had some centimetres of wire leftover.
Picture of the toroids ready to be soldered in:
Finally all other parts and pin headers went in, jumpers were immediately put on where needed.
As I’m using a military-grade plastic box, I have to break-out some components like the display, tuning encoder, volume and rx control from the board. I also have put an on/off switch on the box and already have the CW KEY connector ready installed. I also installed a loudspeaker in the box. The SI5351 board and the Ardiuno Nano are the final components which go into the board after installing all wires.
Picture of the board:
I intend to attach a CW paddle to the box made out of a relay. A HWEF tuner (from EA3GCY) which I was planning to incorporate in the box is I think a bit overkill. That HWEF tuner is already in a nice little box and would be a pity to dismantle, also I’m running out of space in the box… Maybe I can fit in a 9-1unun which would then give me good results on both bands…?
Maybe I will install a battery pack in the same box.
The box with board installed:
The box completed front side:
Mind you, it still needs some additional switches for the CW part of the transceiver.
73
Frank (ON6UU)
Video
Brilliant, Frank! I really appreciate the video as well–sounds like the kit produces smooth audio and should serve you well. No doubt, that military box enclosure will survive even the roughest field conditions!
Many thanks to SWLing Post contributor, Marwan Baayoun, who writes in response to our recent post about radio regrets:
For me, my biggest regret was when in November 2018 I sold my well-protected Sony ICF-SW77.
I bought it brand new over the phone from Universal Radio. My ICF-SW77 was my side kick and went with me everywhere. I remember working the second shift at a publishing company, I would always eat my lunch outside while listening to any international broadcasters I could catch like the BBC, Radio Havana Cuba, Deutsche Welle, or the VOA.
I remember how my co-workers reworded the saying “Life Without A Wife, Is Like A Kitchen Without A Knife” to “Life Without A Wife, Is Like Marwan Without His Shortwave Radio.”
When I got married, my best friend invited us to visit with his wife and children at their house in Upstate New York. He even bought one of the tickets as his way in helping me paying for the fares. I remember the night we arrived at his house me pulling my ICF-SW77 and tuning it to the BBC World Service because we all wanted to get the latest on a sad piece of news that was just breaking that made us, and almost everyone in North America and around the world, stare at TV sets hoping for the best. Then Tom Brokaw came on to announced something that we, and others who were listening to the BBC World Service, had already knew 15 minutes earlier: the sad news the Lady Dianna did not survive the car crash.
My friend was impressed with what shortwave radios could bring to the table.
To close on a happy note, today I received an almost brand new Sony ICF-SW77 that I bought from a very kind gentleman on eBay–he was willing to accept my fifty dollars less than his asking price offer.
My happiness is beyond expression. I would have never thought I would be able to re-unite again with one of these radios in a condition that is identical to the one I sold. He kept it very well. I tried to find a scratch or a piece of dust on this radio but couldn’t. Not only that, it also came with it the original box, very well kept manual and “Catch the Waves” booklet, (I gave mine to the gentleman who bought my radio, so it was sweet that they were replaced with this purchase). My new ICF-SW77 seller just did not have the power adapter that came with this radio, which is fine with me. I can always find a third party power adapter to buy.
I feel so lucky I am once again an owner of one of these awesome radios.
What an amazing story, Marwan, and I’m so glad you’ve been reunited with an IC-SW77!
Radio love is a funny thing and hard to compare with any fondness one might have of other consumer electronics. For example, I’ve never lamented over the loss of a laptop, iPhone, or iPod–but, like you, I have indeed regretted parting with radios. I know many of you feel the same way.
To me, radios feel much more like companions who share the world with you–through travels and over the air.
I’m happy to hear you’ve got your companion back, Marwan!
Many thanks to Matt Roberts (KK5JY) who has kindly given me permission to re-post the following article he recently published on his website KK5JY.net. Many thanks to SWLing Post contributor, Grayhat, for the tip!
Note: The Porch Loop project below is a re-configured Small Receiving Loop (SRL) antenna. For SRL construction details, check out Matt’s primer.
The Porch Loop
by Matt Roberts (KK5JY)
The small receiving loop, or SRL, is a versatile, effective, and very space-efficient receive-optimized antenna for the HF bands. They are easy to build, and can be made very inexpensively. Most typical designs use symmetric shapes, like circles, diamonds, octagons, etc., and are mounted on some kind of mast. This makes it easy(-ier) to install the antenna clear of nearby metal and electronics. It also makes the antenna rotatable, so that the nulls can be pointed at RFI sources.
These aren’t the only options for the SRL, however. These little loops can be made to fit in just about any available space. In fact:
They are effective at any reasonable installation height, including very close to the ground. The installation height doesn’t change the pattern shape, only the pattern strength.
They can be made nearly any shape. The shape does not have to be symmetric about any axis or combination of axes.
They can be fed at just about any point on the loop. A typical feed location is bottom-center, but off-center feeding has negligible effect on the pattern shape.
The wire can be bent out-of-plane; in other words, the loop doesn’t have to be “flat.”
There are a couple of requirements for obtaining predictable performance, however. First, the antenna does need to be an electrical loop. That is, it is a single wire connected between the conductors of the feedline, forming a complete circuit. Also, the circumference of the loop wire should be electrically small (i.e., significantly less than ? / 4) on the bands where it is to be used.
Figure 1. The antenna location (click to enlarge)
As a personal challenge, I recently installed such a loop on my front porch. Everything about this installation defies conventional wisdom — it was installed very close to the ground, it was an irregular shape, it was fed off-center, and the wire was wound in and around an irregular support structure, rather having all the wire in a single plane.
And the resulting antenna still performed very well.
Figure 2: Antenna Location Outlined in Red (click to enlarge)
The loop is essentially the same device as the one in the original SRL article. See that article for more construction details. This version is simply stretched and twisted to make it fit the space and supports available. The wire was woven around the boards in the porch’s deck rail, and fed off to one side, so that the transformer housing could be “hidden” behind the trash cans.
Figure 3: Feedpoint Transformer (click to enlarge)
The wire was insulated with an off-white THHN, which made it blend in with the color of the trim of the house.
Figure 4: 40m Reception 10h Overnight (click to enlarge)
Even with its suboptimal installation details, the overnight 40m DX spots were numerous and well-distributed, as seen in Figure 4. There were DX spots at nearly 10,000 miles, there were NVIS spots, and there were countless at all distances in between. So the antenna was just as effective as its more ideally shaped brethren, despite it’s unconventional installation details.
Other ideas for possible locations of such a device could include:
In an attic. The antenna could be nailed to a vertical panel, or strung like a spider’s web inside the frame of a truss or other open area.
Under a tree. Taking another idea from the spiders, the antenna could be hung and pulled into shape using light guys or tree branches.
On a wooden fence. If you have a wooden fence, the antenna could be installed against the fence panels. This option could allow a wide range of circumference lengths.
Attached to an interior wall of an apartment. The shape could be chosen to keep the loop clear of in-wall wiring, to help preserve its performance.
The original mast-mounted SRL antennas still have some advantages. Perhaps the biggest advantage is that they can be easily rotated to null out a nearby strong noise source. That said, if you are looking for an antenna with better receive performance than a large resonant vertical, the SRL can be stretched and squeezed into service just about anywhere.
Many thanks for sharing this project, Matt! So many of our readers live in situations where they are forced to use stealthy and compromised antennas. What I love about your porch loop is that even though it breaks several loop antennas “rules,” it’s still amazingly effective.
I encourage SWLing Post readers to check out Matt’s website as he has written articles covering a number of interesting radio and antenna projects.
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