Category Archives: Ham Radio

Radio Waves: Hacking Satellites, “Close-Knit” Ham Radio Culture, TV Drama Diplomacy, and Ofcom Relaxes Restricted Service Licence

Leave a reply

(Image: NASA)

Radio Waves:  Stories Making Waves in the World of Radio

Because I keep my ear to the waves, as well as receive many tips from others who do the same, I find myself privy to radio-related stories that might interest SWLing Post readers.  To that end: Welcome to the SWLing Post’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Many thanks to SWLing Post contributors BJ Leiderman, London Shortwave, and Michael Bird for the following tips:

Hacker Used £270 of TV Equipment to Eavesdrop on Sensitive Satellite Communications (CBRonline.com)

“Vulnerable systems administration pages and FTP servers were publicly routable from the open internet.

An Oxford University-based security researcher says he used £270 ($300) of home television equipment to capture terabytes of real-world satellite traffic — including sensitive data from “some of the world’s largest organisations.”

James Pavur, a Rhodes Scholar and DPhil student at Oxford, will detail the attack in a session at the Black Hat security conference in early August.

Pavur will also demonstrate that, “under the right conditions” attackers can hijack active sessions via satellite link, a session overview reveals.

The news comes as the number of satellites in orbit is expected to increase from approximately 2,000 today to more than 15,000 by 2030. (Elon Musk’s SpaceX alone has permission to launch 12,000 satellites.)[…]

A close-knit culture, with separation at its core (Christian Science Monitor)

Ham radio operators are a global collective with a common aim: to forge human connections in an expanding network. As COVID-19 makes us all ‘distance,’ we wanted to tune in to their world.

https://youtu.be/BMeVY_JyLFk

You’re logged in, the Zoom meeting underway, and suddenly faces freeze. The best you can do: Reboot the router and cross your fingers. You’re on the phone with a friend, deep in conversation, and the audio gets garbled as the bars on your phone drop from one to none. Technology can fail us at inconvenient times. But imagine a communications technology that could hold up even in the most rugged and remote situations.

It exists, and it’s much older than the smartphone.

Amateur radio, or ham radio, has been around for more than a century, functioning as both workhorse and recreational hobby. After the Boston Marathon bombing in 2013, amateur operators coordinated communications as cellphone systems became overloaded. They played a key role in Puerto Rico in 2017 after Hurricane Maria took down much of the communications infrastructure. Though there hasn’t been as much of a need during the pandemic – with traditional systems up and running – amateur radio is keeping its own user communities in touch, informed, and emotionally grounded.[…]

Australia criticised for TV drama diplomacy (Radio New Zealand)

[Listen to full interview above or at RNZ.]

Australia has been told it should not send low-brow TV dramas and reality shows to the Pacific, but find out what the region really wants.

Canberra has announced plans to stream television content to the Pacific as part of efforts to promote Australia’s relationship with the region, and to counter Chinese influence.

But a spokesperson for advocacy group, Australia Asia Pacific Media Initiative, Sue Ahearn, says sending programmes like Neighbours, Border Force is not the answer.

She believes Australia could provide a much greater service for the Pacific.[…]

Update: Licensing drive-in movies and church services (Southgate ARC)

Drive-in movie and church service event organisers could be granted temporary radio licences by Ofcom, which may allow film lovers and congregations to come together while still observing social distancing.

Ofcom has today updated its licensing information to offer guidance to individuals or organisations who may wish to hold these types of events. They require a ‘restricted service licence’ from Ofcom, so that people in their cars can hear the film soundtrack, or what is being said, on their FM car radios.

Given the current coronavirus pandemic, we are waiving the usual 60-day notice period for licence applications. We will also process applications quickly, with the aim of providing an answer to applicants within two weeks of it being received.

We recognise that these events may be a way for communities and congregations to enjoy a film or to worship, while still observing social distancing. In granting any licence, however, we are not authorising the event itself. It is for licensees to ensure that any events are permissible under Covid-19-related laws and guidance.

More information, including on how to apply for a restricted service licence, is available.
Licensing information […]

Do you enjoy the SWLing Post?

Please consider supporting us via Patreon or our Coffee Fund!

Your support makes articles like this one possible. Thank you!

Spread the radio love

The Yaesu FT-70G: Where the FT line met Milcom

18 Replies

Earlier today, I stumbled upon a very unique transceiver in Universal Radio archives: the Yaesu FT-70G.

Here’s the description from Universal:

The Yaesu FT-70G is a portable HF transceiver covering 2 to 30 MHz transmit. Receive is from 500 kHz to 30 MHz. Frequency selection is via BCD switches to 100 Hz. There is a clarifier for fine tuning. Optional FNB-70 NiCad Battery. Please note that the optional 10F-2.4DL filter is required for LSB opeation.

The Yaesu FT-70F is similar, but is a channelized fixed version offering up to 11 frequencies.

Two hours ago, I was not aware that the FT-70G existed.  Now? I want one!

I’m a real sucker for vintage rugged field radio gear, so I never discovered the FT-70G until today. Turns out, they’re relatively rare. A little light research reveals that it’s a highly-desired transceiver in the world of HF Packers–those radio enthusiast who like “manpack” commercial and military gear.

The FT-70G has a distinct military look and feel with the BCD switches to change frequency, rugged toggle switches, chassis extensions to protect the front panel, and attached screw-on connector caps.

What’s really surprising is that the FT-70G has a general coverage receiver (500 kHz to 30 MHz). Admittedly, it would not be fun band-scanning with those BCD switches…but still!

This website has a number of photos. They also have a product description likely from the original Yaesu/Vertex Standard FT-70G description:

“The FT-70 series HF field portable manpack transceivers are designed to provide reliable communications under rugged conditions in the military and commercial environment. The frequency synthesized, all solid-state circuitry and die-cast anodized aluminum enclosure and battery pack make a highly portable, weatherproof station. Flexible operation for optimum communications under a wide range of propagation conditions are assured by SSB (USB, LSB), semi break-in CW, AM, or audio interfaced Data modes. All controls, antenna, and interface ports are available and selectable via the front panel for maximum effectiveness and ergonomics in field, base, and manpack applications. The companion antenna tuner FC-70 is compatible with walking manpack, field portable, or base configurations. The highly effective vertical tripod mount antenna system YA-70 is deployed and stowed easily and quickly, pulling double duty by converting to manpack whip while on manuevers. High quality handset YH-70 provides communications privacy and clarity.”

Again, check out the excellent photos of the full manpack kit.

As I researched pricing, I discovered this FT-70R with accompanying FC-70M antenna tuner on eBay right now with only 6 hours left of bidding:

At time of posting, the bids are at $520. I fear this will soar well above my comfort level before bidding ends. (Like I need another field radio anyway, right?)

Post readers: Please comment if you’re familiar with the FT-70G and especially if you’ve ever owned one.  I’d love to hear about your experience with this unique rig.

Spread the radio love

Guest Post: KK5JY’s Porch Loop Receiving Antenna

4 Replies

Can you spot the antenna in this photo?

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.

Spread the radio love

Radio Waves: Free Magazine from URE, C-19 Effect on Listening, Ampegon Focuses on Transmitters, and EU Directive for Car Digital Radio

7 Replies

(Source: Ampegon)

Radio Waves:  Stories Making Waves in the World of Radio

Because I keep my ear to the waves, as well as receive many tips from others who do the same, I find myself privy to radio-related stories that might interest SWLing Post readers.  To that end: Welcome to the SWLing Post’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Many thanks to SWLing Post contributors Mike, Paul Evans,  Josh Shepperd, and Mike Terry for the following tips:

Spain’s URE makes June magazine PDF available (Southgate ARC)

In response to the ongoing Coronvirus situation Spain’s national amateur radio society URE is allowing everyone to download the PDF of the June edition of their magazine Radioaficionados

A translation of the announcement on the URE site says:

One more month, and we have already been three, with the aim of accompanying its readers in the exceptional situation caused by the spread of COVID-19, the URE in its commitment to collaborate and help to cope with the complicated situation we are currently experiencing in our country, has decided to offer free access to the magazine of the month of June and we remind you that magazines prior to December 2019 are also available to you. In this way, citizens who wish to can read these publications for free.

A small gesture so that nobody feels alone at home in the face of this global challenge.

Access is through the website download area, click on “Descargas” under “Junio 2020 – Revista” at:
https://www.ure.es/descargas/

URE in Google English
https://tinyurl.com/SpainURE

Ampegon Puts Focus on Shortwave Transmitters (Radio World)

Ampegon Power Electronics highlights progress on the company’s third-generation solid-state shortwave transmitters, which it says will offer “significant advances in efficiency.”

The company says this work will pave the way toward higher-power broadcast outputs and meet current expectations of a shortwave equivalent to medium-wave and FM transmitters. “Combined, these two developments will bring FM-quality broadcasts with all the benefits of shortwave,” said Simon Keens, Ampegon sales and business development manager.

Ampegon has also developed a retrofit upgrade to current UCS generation control systems for previous generation 100 kW, 250 kW, 300 kW and 500 kW transmitter systems.[…]

Listening together, listening alone: A music professor sounds off on his shifting industries (CBC)

Brian Fauteux reflects on the way COVID-19 is affecting his two passions: music and teaching

A lot of great songs effectively reflect the feelings that accompany isolation. The experience of being alone, however, is often constructed in opposition to a longing for togetherness. Heart’s “Alone” (1987) — maybe the greatest power ballad ever recorded — confidently asserts, “‘Til now I always got by on my own.” But this is no longer the case when the song’s protagonist meets and develops undeniable feelings for another: “And now it chills me to the bone.” In another iconic 80s anthem, “Dancing in the Dark,” Springsteen grows tired and bored with himself against the desperate urge to join up with “something happening somewhere.” The act of dancing in the dark can be fun, sure, but it’s much more fun with others. Inspiration in isolation is insubstantial.

I’m an Assistant Professor of Popular Music and Media Studies, and I teach and write about the role of music in society. I’m interested in how our listening practices shape, and are shaped by, issues of sustainability in the music industries — that is, how artists make (or struggle to make) a living in this day and age.[…]

EU directive on digital radio in cars (Times of Malta)

Directive (EU) 2018/1972 of the European Parliament and of the Council of December 11, 2018, establishing the European Electronic Communications Code (‘EECC’) entered into force on December 20, 2018. Member states have two years to incorporate it into national law, except where specifically mentioned.

Radio is an important medium through which citizens access a diverse range of information news and entertainment services. The EECC leverages on the ever-increasing connectivity of new generation cars as well as on the digital platforms of radio broadcasters to guarantee a more robust radio experience to all drivers, ensuring good coverage, a wider choice of radio stations and more effective access to information at all times. The EECC ensures that car drivers have access to the benefits of digital terrestrial radio wherever in the EU they have bought their new car.

On April 21, the minister responsible for communications, in consultation with the Malta Communications Authority, published Legal Notice 151 of 2020 amending the Electronic Communications Network and Services (General) Regulations, implementing the provision of the EECC dealing with the interoperability of car radio devices. In line with the regulation, any car radio receiver integrated in a new vehicle of category M which is made available on the market for sale or rent in Malta from December 21, 2020, shall comprise a receiver capable of receiving and reproducing at least radio services provided by digital terrestrial radio broadcasting of type DAB+. Radio programmes in Malta are broadcast terrestrially on DAB+.

The car radio requirement only applies to new cars.[…]

Do you enjoy the SWLing Post?

Please consider supporting us via Patreon or our Coffee Fund!

Your support makes articles like this one possible. Thank you!

Spread the radio love

Elecraft K4 Update (and a few photos)

Leave a reply
Elecraft K4

An early Elecraft K4 prototype at Hamvention 2019

Many thanks to SWLing Post contributor, Paul Evans, who passes along this message from Eric Swartz at Elecraft (photos follow message):

K4 UPDATE

by Eric Swartz May 19, 2020

Hi Everyone,

At Elecraft, like many of you, we are in our 9th week of shelter in place. This has been tough on all of us. Back on March 16th, when the initial California state and local orders were issued with an April 11 estimated end date, we suspected that it would last longer than that, but not as long as this. The majority of our production team had to be furloughed immediately, with a few working from home. Most of our sales, support and the K4 engineering team have also been working from home. We allowed a minimal skeleton staff on site. ( Less than you can count on one hand, with each operating alone in large separate areas.). We’ve been able to ship a subset of our existing radios and accessories from finished goods stock, which has kept cash flow coming in. We thank you for the continuing orders!

We’ve also spent this time totally reorganizing our sales, operations, production, and test areas for proper social distancing along with extreme cleaning and health screening procedures as per the new local and national COVID-19 guidelines for manufacturers. (Wearing masks at all times, Daily health screening upon entry to the building, additional spacing and partitions between work stations and ‘you touch it, you clean it’ procedures, etc.) This is a required change as per our local and State health departments.

Many of our local sub-contractors (sheet metal fabrication, circuit board assembly, etc.) have also been impacted by shelter in place orders. Over the coming weeks, as the State and local health authorities slowly allow more activity, we should be able to get better delivery estimates from them as they are able to ramp back up. Like us, they are eager to get back online. National and international parts suppliers have been similarly impacted.

So what does this mean for first K4 shipments? Prior to the Covid-19 pandemic, we were projecting first K4 deliveries beginning sometime in the April – May window this year. Obviously the pandemic has thrown out those estimates. Based on a gradual reopening in California and other areas, our current feedback from suppliers, and taking into account unexpected delays, shortages, last-minute engineering changes, etc., my estimate is that the first K4 shipments will begin somewhere in a window of late July through the end of August 2020. We’ll keep you informed as we get better information.

As a side note, I’d like to thank everyone who has ordered a K4 for your support. We anticipated seeing cancellations during this pandemic delay, but we have received very few. Our K4 order backlog has actually continued to increase over the past 9 weeks. Wow! You, as our supporters and customers, have continued to energize and amaze us as we have created new products for you these past 21 years. Thank you.

Also, as with all of our products, our engineering team keeps designing new features during the product‘s lifetime. They certainly have not been idle on the K4 during the shelter in place order. (Our DSP S/W defined radio architecture allows us to continually give you a ‘new’ radio with each new sw release. 🙂

Keep an ear out for us on the air too. While making a few short test transmissions with my K4 this morning, I ended up in a very nice QSO on 20M SSB! If you hear me, or others on our team, please say “hello.” We may be on a K4!

We hope you, your family and friends stay safe and healthy.

73,
Eric

 

Thanks for the tip, Paul!

This morning, I found a few photos I took of a prototype K4 at the 2019 Hamvention and 2019 W4DXCC conference. Thought I’d post them here for those who’d like an up-close look at the K4’s front panel:

Eric Swartz demoing tablet control of the K4 at the W4DXCC

 

Spread the radio love

Radios that may not be benchmark, but are pure fun–!

53 Replies

Many thanks to SWLing Post contributor, John R Palmer, who replied to our previous post about radio regrets with a question.

John asks:

Name a piece of radio gear that for some reason, technical, emotional, design etc. that you’ve gotten more fun using than you would ever have expected based on its price, maybe more so than other much more expensive radios you’ve owned. Just a piece of gear that really hit the spot and you’ve had a blast using.

That’s a tough question indeed, John. I hope readers will chime in with their replies–I’m very curious!

So I gave this quite a bit of thought and came up with two radios–one shortwave portable and one general coverage ham radio transceiver:

The Radio Shack DX-351

In 1996, I worked for a Radio Shack corporate store in Athens, Ohio. I believe we were getting ready for the Black Friday/Christmas season and the store manager decided to go through a pile of broken items customers has returned using their extended warranty. He had accumulated quite a number of returns in a box next to his desk in the back of the store. I stayed after hours to help him organize the shelves and prepare for incoming shipments.

Most of the items in his box were physically broken, but still covered by the extended warranty (to their credit, many RS store managers were quite flexible with extended warranty returns). He pulled out a Radio Shack DX-351 from the box.

The customer returned this portable because the AM/FM/SW slider switch was broken. My manager knew I was an SWL, so asked if I wanted it. He said, “If you don’t, it goes into the trash can because we can’t re-sell it.”

How could I resist?

This DX-351 was “well-loved.” I can’t remember all of the details, but the AM/FM/SW band switch could not be fixed, but I didn’t mind because the receiver was stuck on the shortwave band and the other shortwave band switch worked perfectly.

The DX-351 was a joy to use and amazingly sensitive! It wasn’t particularly selective, but it served me well for many years living, primarily, in the glove compartment of my car. If I took a road trip, a lunch break at the park, or if I was simply waiting in a parking lot to pick up my wife, I’d pull out the DX-351 and tune in the world.

The thing was pure fun to tune.

The Icom IC-735

In the world of general coverage ham radio transceivers, the Icom IC-735 would be my choice.

The IC-735 was my first ham radio transceiver. I used my hard-earned savings (from working at Radio Shack!) to buy a used unit via the now closed Burghardt Amateur Radio Center in South Dakota. My friends, Eric (WD8RIF) and Mike (K8RAT), believed a used IC-735 would serve me well. They were right!

What I really loved about the IC-735 was that it had all of the features and modes I needed. It was easy to operate and, while I couldn’t call its receiver “benchmark” by any means, it was amazingly sensitive and selective.

I logged hundreds of hours on this radio in both SSB and CW, working DX across the globe.

But I spent even more time SWLing. Turns out, the IC-735’s general coverage receiver did justice to shortwave broadcasts. The AM filter was wide enough to produce wonderful audio (especially via an external speaker or headphones). For years, the IC-735 was my go-to shortwave radio because it performed so much better than any other radios–mostly portables–I had at the time.

The IC-735 was so much fun to use.

I did eventually sell it, if memory serves, to purchase my first Elecraft K2 transceiver.

What are your choices?

So what are the radios you’ve owned that may not sport the best performance, and may not have been terribly expensive, but were pure fun to put on the air–? Perhaps you still own one? Please comment!

Spread the radio love

Just pulled the trigger on the new QCX+ CW/WSPR QRP transceiver kit

3 Replies

I’m a real sucker for kits of any stripe.

A few days ago, my buddy, Pete (WB9FLW), sent me a tip about the new QCX+ CW/WSPR transceiver by QRP Labs. I posted an announcement on QRPer.com.

I’ve yet to build a QRP Labs kit, but I’ve only heard positive reviews from readers and friends. QRP Labs’ president, Hans Summers (G0UPL), is an amazing kit designer and, indeed, won the 2019 Homebrew Heroes Award.

Hans kindly took a break so that I could snap his photo at Hamvention 2019.

Last year, at the 2019 Hamvention, QRP Labs had a table across from ours and, based on the amount of people huddled around his table all day long, I’m certain he was one of the busiest vendors at Hamvention.

His new QCX+ transceiver is an upgraded/updated version of the original QCX transceiver which has sold nearly 10,000 units. In the following video, Hans describes in detail how the QCX+ is designed and the differences between it and its predecessor:

Since I’ve quite a few things on my Social DX bucket list–including the recent addition of QRP EME (I mean, what am I thinking?)–and since I don’t really need yet another CW QRP transceiver, I required a good excuse to buy and build this kit. So I turned to my editor at RadCom who very much wanted review. Fantastic excuse! Thank you!

The amazing thing about the QCX+ is you getting a full-featured single band QRP transceiver for $55 US plus a modest shipping fee. This means pretty much anyone can afford to buy and build one.

I just placed an order for the transceiver ($55) with a 40M band module, the optional custom aluminum enclosure ($25), and the optional GPS receiver ($23). If I had a 3D printer, I might have skipped the enclosure because I’m willing to bet that shortly after the transceiver’s release, someone will share an enclosure design one can print at home. Then again, since I know I’ll take this little rig to the field, an aluminum enclose will provide excellent protection.

I purchased the optional GPS receiver because I plan to eventually put this rig into use as a dedicated WSPR beacon. The GPS module will calibrate the frequency, time, and Maidenhead Locator grid square in WSPR mode. It can also be used to precisely calibrate the transceiver’s synthesizer reference oscillator.

Kit anticipation time!

According to the QRP Labs website, they plan to start shipping the QCX+ in mid-June. I opted for FedEx delivery, so hopefully it’ll arrive sometime around my birthday (Happy Birthday to me!).

More than anything, I simply enjoy building kits and really look forward to building the QCX+, then putting it on the air! I’ll post updates and a few photos here, but look for my full review likely this fall in the pages of RadCom.

Post readers: Please comment if you’ve built a QRP Labs kit or have any other kits in the pipeline this summer!

Spread the radio love