Category Archives: How To

Another solution for whole-house shortwave

London Shortwave posts the following on Twitter:

Inspired by @SWLingDotCom‘s RaspberryPi post I put this together to listen to the radio in my shack around the house http://youtu.be/vOX41wIS1Qk 

On YouTube, London Shortwave explains that much of his modern system was inspired by a drawing from a 1930s shortwave listening magazine.

Below is a scan of the original illustration that inspired him:

WholeHouseShortwaveRadio

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My Raspberry Pirate is now radio-active

RaspberryPirateRadio

Two weeks ago, Make Magazine published a simple hack that turns your Raspberry Pi
into a low-powered and portable FM transmitter/radio station.

For those of you not familiar, the Raspberry Pi is a single-board computer developed in the UK by the Raspberry Pi Foundation. The RasPi is a cleverly-designed, useful device–especially if you like tinkering with mobile computing. Best yet, the Raspberry Pi is very inexpensive; the basic computer costs a mere $40 US, though there are starter kits that include common accessories for $70-80.

One of the first things I did upon returning home, following nearly two weeks of US east-coast travel (which included the Winter SWL Fest), was to build my own Rasberry Pirate Radio. I had hoped to make the radio before my trip, but thought I wouldn’t have enough time. Had I known what I know now–that the Raspberry Pirate Radio is a super simple and easy hack–I would have made it anyhow and taken it along for the ride.

My antenna wire connected to pin 4. (Click to enlarge)

My antenna wire connected to pin 4. (Click to enlarge)

To be fair, what makes this project so simple is the fact that Make Magazine so beautifully documents the procedure on their website.  It also helped that I have a little familiarity with creating disk images–still, I’m certain that if I were a total newbie, I could have done all of this within 30 minutes…Which is just what I did.  And I’ll bet you can, too.

There are really only three steps required to make your own Raspberry Pirate Radio:

  1. Make a simple FM antenna and attach it to pin 4 on the Pi’s board. In my case, I had a small dual conductor connector attached to about eight inches of twisted pair wire. I simply connected one side of this connector to pin 4. Since my FM antenna is not cut to a resonant length, I know I’m compromising the FM transmitter’s range a bit…Still, it’s what I had on hand, and it works!
  2. Download Make Labs‘ disk image and flash it to your SD Card.
  3. Add music to the “Pirate Radio” partition of the SD card and edit the config file to your preferences. If you have the option to do this step on Mac OSX or Linux, the process is much easier than on Windows. But Windows users, fear not: Make Magazine describes, in detail, how to add files.

After I finished these steps, I simply plugged in my Raspberry Pi and tuned one of my radios to 89.9 MHz (the frequency I chose and saved to the config file). The Pi booted and started the Raspberry Pirate Radio script automatically.  Brilliant!

RaspberryPirate-FMRadio

It’s alive!

Being a shortwave radio nut, of course I loaded my Raspberry Pirate Radio with a few gigabytes of my off-air recordings that are a heavy on music (all of which you, too, can pull from our Shortwave Radio Audio Archive). It’s kind of fun tuning my bedside Tivoli Audio Model One to 89.9 MHz and hearing the Voice of Greece, with all of its shortwave audio characteristics. If I close my eyes, I can pretend the Model One has a shortwave band. Love it!  Just the thing to drift off to…

I’ve kept the Raspberry Pirate Radio running nearly 24/7 here at home. I’ve also had excellent luck running the radio mobile by using my Eton Rechargeable Battery Pack as the power source (Universal Radio also sells a higher capacity version, if you like). I’ve yet to test how long the power block will run the Raspberry Pi, but I imagine it will last for a couple of hours, at least.

RaspberryPirate-EtonBlock

If you want to take your Raspberry Pirate Radio in the car, it’s a simple matter to power it with a 5VDC USB power plug. You probably already have what you need, especially if you charge your mobile phone in the car.

If you’ve never experimented with the Raspberry Pi, this is a perfect first project for you. Just think about it: for under $50, you can make a simple-yet-effective FM radio station which shuffles your favorite music or recordings from any source–from obscure radio pirates to far more distant stations. Besides, once you have a Raspberry Pi, you’ll find there are thousands of other radio projects to occupy your rainy weekends.  Enjoy!

Many thanks to Make Magazine for posting this simple project!

Update: Several people have written concerned that the Raspberry Pirate Radio has no output filtering of its RF signal.  This is true. Though I have not tested it, I would have to assume that it could radiate on harmonic frequencies and potentially interfere with other radios. Though the broadcast footprint is very small, if you live in a high-density neighborhood, you will need to keep this in mind. I live in a very rural area and my nearest neighbor couldn’t possibly hear my Raspberry Pirate Radio.

I’m very curious if there’s a simple mod to filter the output RF. If you can think of one, please comment!

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Make a Raspberry Pirate Radio

Sorry, I just couldn't resist the urge to make a pirate graphic.

Sorry, I just couldn’t resist the urge to make a Raspberry Pi-rate graphic.

Many thanks to SWLing Post reader, Paul, for this article on Make Magazine that teaches you how to turn your Raspberry Pi into an FM transmitter. Make Magazine states that this FM transmitter “has enough range to cover your home, DIY drive-in movie, a high school ball game, or even a bike parade (depending on the stragglers).”

What a simple hack:

(If the embedded video above doesn’t appear, simply click here to watch at Makezine.com.)

Raspberry Pi’s are very inexpensive (less than $40 US on Amazon) and a fun tool to have around the shack anyway. I plan to try this project as early as this weekend. I have many hours of shortwave radio recordings that I would love to pipe through the house via FM. I only wish the Raspberry Pi could broadcast in AM. Perhaps one day…

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How To Tune In Pirate Radio Broadcasts on Shortwave

This article originally appeared in the February 2014 issue of The Spectrum Monitor Magazine.


QSL from Radio Gallifrey Intergalactic

QSL from Radio Gallifrey Intergalactic

Even as many legacy international broadcasters are abandoning the shortwave bands, shortwave remains active and vibrant in another quadrant: namely, on shortwave pirate radio. Over the past few years, I’ve found that one of my favorite listening activities has become searching for unique pirate radio stations, and readers of my blog appear to have followed suit. Among the most popular queries made by readers is, “How can I find and hear pirate radio stations?” To help answer this question, I’m writing this primer.

Who are pirate radio stations?

Many are confused by the term “pirate radio,” otherwise known as “free radio.” Either term is sufficient, and some stations prefer one designation or the other. For consistency’s sake, I will use the term “pirate radio” in this article.

So what is pirate radio? Andrew Yoder, author and publisher of the 2012 Pirate Radio Annual, defines pirate radio as:

“[A]ny unlicensed hobby broadcast operation that is using more power than the legal limit.”

As Yoder goes on to explain in his introduction of the 2012 Pirate Radio Annual, pirates are often confused with radio bootleggers (who conduct unlicensed two-way conversations), clandestine stations (usually political stations), and jammers (who intentionally try to block broadcasts).

While debunking myths about pirates, I can say that in my years of pirate radio listening I’ve never heard a pirate intentionally jam a legal broadcaster.  Pirates tend to occupy swatches of the shortwave spectrum that are relatively quiet, avoid intentionally broadcasting on top of one another, and typically operate at fairly low power. I believe this is why authorities like the Federal Communications Commission (FCC) place shortwave pirates comparatively lower on their enforcement priority list.

And while pirate radio stations can be found across the radio spectrum, especially on AM and FM in urban areas, in this primer I’ll be focusing on those that inhabit the shortwaves.

What do pirates broadcast?

Pirates broadcast a wide variety of content, but are usually motivated by sharing their message–or favorite music–on the air.  Some pirates simply key down their mike and begin talking, sharing their political or social views; others offer near-professional music productions, complete with listener feedback, and often acknowledge listener reports with QSLs (radio postcards).

I received this QSL from the amazing Radio Ronin Shortwave shortly before he received "the knock" from the FCC and stopped transmitting.

I received this QSL from the amazing Radio Ronin Shortwave shortly before he received “the knock” from the FCC and stopped transmitting. (Listen to one of Ronin’s broadcasts below.)

RadioRoninShortwave-QSL-Back As a self-proclaimed “content DXer,” what interests me in pirate radio is that the listener never knows what to expect, but you can guarantee that the content will be different from that of the major broadcasters.

To prove my point, here are some MP3 recordings of some of my favorite recent pirate radio stations/broadcasts:


Radio Casablanca


Boards of Canada HF


Wolverine Radio


Hard Tack Radio


Radio Strange Outpost 7


Radio Ronin Shortwave

Where do pirates broadcast?

QSL247Though pirates can be located anywhere on the planet, and therefore can broadcast, hypothetically, anywhere on the radio dial, patterns are actually fairly predictable in order to draw a listening audience. Pirate stations want listeners to discover them, so they broadcast in various “watering holes.”

With that said (and for reasons I don’t fully understand) depending on where you live in the world, you will either find it very easy to locate pirates…or extremely difficult. If you live in North America–particularly on the east coast–or in Europe, you’re in luck: these are the hottest geographic locations for shortwave pirate radio activity. If you live in other parts of the world, pirate hunting can pose serious DX challenges.

Again, I turned to Andrew Yoder for insight about pirate radio activity in the rest of the world; his reply:

“I’m always amazed at how few areas in the world have pirates that are connected to any scene. Back when KIWI was on the air regularly in the ’90s, I assumed that pirate radio would explode in Oceania and Asia. Not just Aussie and NZ pirates, but stations in places like The Phillipines…maybe Japan, South Korea, or Thailand. Nothing. Radio G’Day came on from Australia occasionally, but no one else. And when KIWI went silent, that was it. South America was strong for a while in the ’90s, but that has also fallen silent. I know that lots of pirates operate there, mostly on AM and FM, but no one is on SW…and if they are, they aren’t sending QSLs, [or] operating in places where radio hobbyists would hear them…”

Yoder actually addresses this apparent restriction, to some degree, in the 2013 Pirate Radio Annual, which has only just been released.

Hunting equipment

Before we talk about where to hunt pirates, however, we need to talk about the necessary equipment–i.e., your radio and antenna.

Unlike trying to locate China Radio International, Radio Australia, or the BBC World Service, hunting pirates requires a decent-quality radio and antenna.  Keep in mind that pirates are relatively low-power broadcasters. While the magic of shortwave radio can transport a small signal vast distances, to hear pirates regularly and clearly, some precision is required.

Listening to Channel Z in a parking lot.

Listening to Channel Z in a parking lot.

If you live in a geographic hotbed of pirate activity (again, eastern/central North America and Europe) you might find a portable radio ample for hearing a number of pirates. Indeed, this past November, I listened to the pirate Channel Z while sitting in my truck; I was only using a Tecsun PL-660 with the antenna extended out of my opened driver’s-side window.

Though Channel Z was broadcasting in AM, as many do, it’s best to hunt pirates with an SSB-capable portable. Why? Unlike major broadcasters, many pirates don’t stick to AM as a preferred mode. Indeed, since pirates are operating at lower power, they get much more bang-for-the-watt out of SSB. To track pirates, you’ll need a radio with both AM and SSB modes.  It will also help to have some sort of adjustable bandwidth filter (wide/narrow). I’ve hunted pirates with a range of such radios, among them the Sony ICF-SW7600GR, the Grundig G3, the Grundig G5, the Tecsun PL-600 and PL-660, and even the new Tecsun PL-880.

It’s much better, of course, if you have a table-top receiver, software-defined radio, or ham radio transceiver with a general coverage receiver hooked up to a resonant outdoor antenna–especially if you live outside Europe and North America. I’ve had great results in the past with an old Icom IC-735 and a 40-meter dipole antenna. The important thing here is that you invest in a receiver with a respectable degree of sensitivity and selectivity. You might need that sensitivity and an outdoor antenna to pull these relatively low-powered signals from the ether.

RadioCasablancaQSL

How to hunt pirates

Back in the 1980s, before the Internet and its online bulletin boards, I thought finding pirates was truly a hunt–random and altogether unpredictable.  Now I know that finding pirates is reasonably achievable; at least, it is possible to know roughly where, and generally when, to find them. Fortunately for the beginning pirate-hunter, there are now online message boards, free radio logs, and even publications (like Yoder’s excellent treatise on the subject) to help guide your tuning (see resource links below).

JFK Shortwave QSL-Pirate radio operators usually have day jobs–like most of us–thus only transmit while home from work.  While you can hear some on weekdays, your best bet is Friday, Saturday and Sunday nights, local time. So, for example, if you’re listening for North American pirates from Europe, you’ll need to plan accordingly. Pirates are always active during holidays, too,  most especially on Halloween (31st of October), which seems to be pirates’ favorite holiday.

I’ve noticed increased pirate radio activity during the winter months, as well. This is likely due to the early sunsets and cold winter nights of the northern hemisphere that tend to keep people indoors, which in turn encourages pirates to hit the air.  Moreover, summer conditions in the North American “43 meter” band  are often much noisier, thus pirates know they’ll be fighting static crashes to be heard during the summer months. In the quieter winter months, stations seem to pop out of the ether.

North American Pirates

The bulk of the pirate radio broadcasters I log transmit just below the 40-meter amateur radio band: anywhere from 6,850 kHz to 6,970 kHz and typically on a frequency spaced at 5 kHz. The most popular frequency is arguably 6,925 kHz, but I often log pirates on 6,935 and 6,950 kHz.

Radio_Borderhunter_qsl_thomas_witherspoon-X

Borderhunter Radio is one of the strongest Euro Pirates I’ve ever heard. (Click to enlarge)

Euro pirates typically broadcast in the 48 meter band (6,200 – 6,450 kHz), but the HF Underground notes that you will also hear Euro pirates on the 75 meter band between 3,900-4,000 kHz, on the 19 meter band (15,000-15,100 kHz and 15,700-15,900 kHz), and even on the 13 meter band (21,000-25,000 kHz).  My most recent logging of a Euro pirate from North America was Radio Borderhunter on 15,500 kHz; his signal was quite amazing.

Outside of the pirate world? Fear not

If you live outside of North America and Europe, that doesn’t mean there aren’t pirate radio stations to be found. Ask your local radio club or search the Internet for local/regional pirate stations. Additionally, you can always tune a remote receiver, via the Internet on the Global Tuners website, or via the University of Twente’s SDR in the Netherlands.

We’ve now covered the who, what, where, when, and how of pirate hunting–but what about why?

Why chase pirates?

Whether you’re a QSL collector, a “content” DXer, or the casual SWLer, I find there’s something in pirate radio listening for everyone. Speaking for myself, I’m passionate about pirate radio listening because it combines my listening/technical skills, my appetite for highly unique content, and for building a collection of quirky QSL cards. Compared to big-gun broadcasters, pirates are much more elusive game as very few announce their broadcasts in advance, and there’s no telling where a pirate’s transmitter is located: it could be in their home, on a boat, or a portable one dropped in a remote location and later retrieved.

I decoded this Wolverine Radio SSTV QSL on the SSTV iOS App

I decoded this Wolverine Radio SSTV QSL on the SSTV iOS App

Chasing pirates has also increased my technical know-how. For example, though I’m a ham radio operator, I had never even attempted to decode the SSTV (slow-scan TV) mode until prompted to do so by Wolverine Radio: at the end (and sometimes in the middle) of their broadcasts, Wolverine is known to send electronic QSL cards via SSTV.

I’ve also been encouraged by pirates to hone my weak-signal DXing using exalted carrier reception (ECR)–zero-beating an AM signal in SSB–in an attempt to hear weak AM pirate stations. It’s a simple technique, and although it takes some practice, will work on most any radio with a stable BFO (beat frequency oscillator).

And did I mention the cool QSL cards?  Pirate cards are among the most unusual of QSL cards, that often incorporate obscure or vintage imagery–humor, horror, or other graphic oddity–or cast the pirate in a unique character representation.  They can be highly entertaining or thought-provoking, and thus are, themselves, a unique art form.

Don’t believe me?  Do a little pirate radio hunting yourself.  Like me, you might just get hooked!

My favorite pirate radio resources:

The Pirate Radio Annual:

This little book by Andrew Yoder is the equivalent of the WRTH (World Radio TV Handbook) of the pirate radio world. I keep a copy handy as it helps me identify stations and better understand their format. Additionally, you’ll find contact information for QSL requests and mail-drop addresses as well.  Each issue also contains a CD of sound clips from various pirates, several articles about the state of pirate radio, and other relevant info.

The HF Underground: http://www.hfunderground.com

An excellent and active pirate radio forum hosted by Chris Smolinski. Loggings are in real time and there are very few–if any–off-topic posts.

Pirates Week: http://shortwavepirate.info

Ragnar Daneskjold hosts an occasional podcast serving the shortwave pirate community; it includes pirate radio news, off-air recordings, and more.

Hobby Broadcasting Blog: http://hobbybroadcasting.blogspot.com/

Pirate radio guru Andrew Yoder started his own pirate blog last year, and has already began populating it with regular updates, QSLs, and recordings.

Free Radio Weekly:

The FRW is an email-only newsletter devoted to the hobby of pirate radio listening, and is distributed free to those who contribute. You can sign up for the newsletter by emailing any of their edittors: John Brewer ([email protected]), Ragnar Danskjold ([email protected]), Harold Frodge ([email protected]), Dave Turnick ([email protected]) or Larry Will ([email protected])

The SWLing Post

OK, I suppose I must also mention my own humble blog, where I continue to amass numerous pirate radio loggings and off-air recordings.  Just browse the pirate radio category: https://swling.com/blog/category/pirate-radio/

Note: Even though it is illegal to broadcast on the shortwave bands without a license, and those who do so are subject to hefty fines, it is not illegal to listen or to send and receive QSL cards from such operators.

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Video: Build a radio in less than one minute

DIY-Radio(Source: Southgate ARC)

“Due to the numerous requests from his Build-a-radio-in-5-minutes, radio amateur Tommy Helgevold OZ4KID decided to make a better video with explanations on how to make a radio like this

He also decided to beat his old challenge as well…

…so without further ado, I present to you – How to build a radio in less than 1 minute, can you build it?

There’s even a schematic in the end of the video + an animated version of the entire breadboard setup.

Thanks for watching, & enjoy.

Watch Build a radio in less than 1 minute”


Click here to view on YouTube.

While less detailed, you can also view OZ4KID’s DIY Radio in less than 5 minutes by clicking here or viewing via the embedded video below:

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Running SoniqWare SG-1 on a Windows PC

sg1-gui-fordocRecently, I posted a video showing how @LondonShortwave uses the GarageBand plugin, SoniqWare SG-1, for noise reduction. Since GarageBand is an Apple application, I didn’t believe SoniqWare SG-1 would work on a Windows PC, but SWLing Post reader Jeff Benedict (KB7AIL) writes:

“I run Mac OSX and GarageBand so it’s not really a concern of mine but, according to the documentation, SG-1 is compatible with Windows sound processing applications.
Here’s the documentation from SoniqWare:

From:  http://www.soniqware.com/pdf/SoniqWare-SG-1.pdf
p. 17

System Requirements
• Microsoft Windows XP/Vista,
• Mac OS X 10.5/10.6,
• 512 MB RAM,
• VST, VST3, or AU compatible host software

An explanation of the VST and a list of applications for Windows which are compatable with VST plug-ins:

http://en.wikipedia.org/wiki/Virtual_Studio_Technology

Of course, this comes with the caveat that I do not run any version of Windows or any of these sound processing applications so YMMV.

A short explanation of the different formats for sound processing plug-ins:

http://support.pluginboutique.com/knowledgebase/articles/51119-interface-types-explained-vst-rtas-au-etc-

Many thanks, Jeff, for the tip!

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Shortwave noise reduction via GarageBand plugin

sg1-gui-fordocMany thanks to @LondonShortwave, on Twitter, who made a video showing how to use a GarageBand plugin to filter noise out of shortwave audio in real time. He describes this on his YouTube channel:

“I recently discovered a Mac AudioUnit plugin called Soniqware SG-1 that allows real-time noise filtering based on a brief noise sample (sometimes referred to as the “noise profile” or the “noise fingerprint”). This video shows it being applied to shortwave radio signals, which I believe is a first, as I have been unable to find anyone else who has already done it. In a number of cases, it turns laborious DXing into armchair listening.

The antenna used in these experiments is a Wellbrook ALA1530SP-1 and is positioned indoors. More information is contained in the first few seconds of the video.”

Click here to watch the video on YouTube.

Note that GarageBand is an application only available on the Mac OS X platform. Fortunately, it comes free with every new Apple computer purchase. You can find the Soniqware SG-1 spectral noise gate plugin by clicking here.

Be sure to follow @LondonShortwave on Twitter: http://twitter.com/LondonShortwave

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