Tag Archives: DXing

Dr. Phil’s radio articles: portable SDR and pocket DX

RTL-SDR-001SWLing Post reader, Dr. Phil, recently contacted me regarding a collection of articles he’s written about DXing and radio modifications.

His site actually has a number of useful articles that I’ll plan to convert to future posts, with his permission.

Sony ICF-S10MKIII asked Dr. Phil for links to two of his most popular publications. He replied:

My two big recent articles are shown below. One is about “Pocket Radio DX”: using under-$20 radios to DX (started in 2003). Click here to download as a PDF.

The other is about using an $18 NooElec TV-tuner as a MW and shortwave receiver. Click here to download as a PDF.

Brilliant! Thanks so much for sharing these, Dr. Phil!

I actually have a  Sony ICF-S10MK2, which I consider to be a capable and useful little AM/FM receiver for the sub $20 price. I’ve also been very tempted to purchase an RTL-SDR dongle, so I may go ahead and bite the bullet on one of the NooElec SDR dongles.

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SWLing Post DXpedition at PARI is all systems go!

DSC_0884Some of you may recall a post I published last year regarding a shortwave and medium wave DXpedition at the Pisgah Astronomical Research Institute (PARI), a 200-acre radio astronomy observatory and former NASA tracking station located deep in the mountains of western North Carolina.

Since this is the first event of its kind, we’ve been working closely with PARI staff to put the DXpedition together.  And come together, it has.

I’m pleased to announce that we’ve now received the official go-ahead: we’re clear to launch the (first-ever!) 2015 SWLing Post DXpedition, which will take place Friday, October 9, through Sunday, October 11.  Come join us!

PARI will soon post the official registration form on their website; of course, I’ll post an update when this form is ready.

Meanwhile, those of you who may be interested in attending, keep reading…and do join our dedicated email discussion group (more info below).

A few DXpedition details…

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As I mentioned last year, PARI has agreed to handle all of the event’s arrangements, and will even provide a limited number of basic shared dormitory rooms to the first registrants who request them. An event fee will pay for facilities and PARI staff (see below); modest profits, should there be any, will benefit PARI’s worthy science education mission.

We are fortunate to be sharing the beautiful PARI campus with with a larger party of amateur astronomers, aka, a “star party,” taking place the same weekend; the DXpedition will benefit from this in terms of expanded facilities access. An additional benefit is that we can share our passion for radio with members of the star party, while learning a little about astronomy from their members.  And for those of us who enjoy both, all the better.

Costs

The costs associated with the event are as follows:

Registration fee: $100

Lodging: On campus, the fee is $50 per night, per person, in a shared dormitory room; or $20 per night, per tent or travel trailer (no hook ups, though electricity is available). Want to come along, but not interested in roughing it? You’ll find numerous comfortable hotels and inns within a 30-40 minute drive of PARI’s mountain campus.

Meals: Catered meals will be provided for a modest charge to be determined (PARI is working with local food services to arrange our meals currently). Of course, you can always bring your own food and prepare it on-site, as well.  The campus has a lunchroom with a microwave.

The PARI campus and accommodation

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PARI was formerly a NASA tracking station, and following that, a Department of Defense monitoring facility.  Because of the remote nature of the campus, basic on-site dormitories were built; scientists use these throughout the year as they conduct their research, and the shared rooms are available upon request.

Typical PARI dorm room (click to enlarge)

Typical PARI dorm room (click to enlarge)

The dormitories are conveniently located in the heart of the 200-acre campus, and sleep about four to each room.  These are simple facilities, and no private rooms are offered. Bathrooms (with showers) are shared, and separate buildings house men and women; thus the dormitories may not be the best option if you plan to bring a spouse, a large family, or young children.

Of course, if you enjoy camping and/or star-gazing, you can pitch a tent (just $20/night), or park your travel trailer on campus (also just $20/night). Note that this is not a travel park, thus hook-ups for travel trailers are not supplied, although power is available.

For those who prefer not to camp or stay in a shared room, the nearby mountain town of Brevard, NC (approximately 35 minutes from PARI by car) is a charming small town offering numerous hotels, bed-and-breakfasts, and other comfortable private accommodations. PARI often recommends the Hampton Inn in Brevard, NC. Hotels.com and AirBnB offer alternatives.

Receivers, antennas, and other radio equipment

DSC_0904DXpedition participants should bring their own receivers, antennas, and accessories. If you wish to bring an SDR or tabletop receiver, there are quite a few places on campus where you’ll have access to power. At least one main listening post will be set up under cover, as well, for our participants.

Feel free to bring any type of receiver you like. A few potential participants have noted that they plan to bring a portable receiver only, and that’s absolutely fine–this is your DXpedition, your chance to sit back and listen to your radio without distraction, so any radio you choose to bring is the right one.

Of course, a few SDRs, tabletops, and portable receivers will be available for participants to try out, so if you can’t bring your own receiver, please let me know in advance; I’ll try to reserve a time slot for you to use one of the available rigs.

SWLing Post DXpedition email group

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We have created an email discussion group for the DXpedition. If you are seriously considering joining the DXpedition, click here to become a member of the group as this is the place where we’ll organize and make further plans.

Since this is the first time the SWLing Post and PARI have sponsored a DXpedition, we’re certainly trail-blazing here. My sincere hope is that this event will lead to future DXpeditions…not to mention, real friendships among our readers and fellow SWLers.

Looking forward to the DXpedition–we’ll see you at PARI in October!

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Anthony rediscovers radio

Analog Radio DialCheck out this charming article about rediscovering radio by Anthony M. Castelletti in The Buffalo News:

“As a child in the 1960s, I enjoyed listening to distant radio stations, I suppose initially for no reason other than because they came from far away. It was a young boy’s hobby based on the accidental discovery of 1050 CHUM in Toronto. Remember, this was quite a feat for a one-transistor, pocket AM radio without an antenna that was the product of 1950s technology. I soon discovered that if I took that little radio outside, even more distant stations were right there on that dial.

Along with my beloved hometown Buffalo Bisons, I also became a fan of the Fort Wayne Komets hockey team, not due to any connection to Indiana, but rather due to my ability to listen to their games on WOWO-AM. This was soon followed by CKLW from Windsor, Ont., a rock ’n’ roll station as powerful as my hometown favorite KB 1520.

It took a couple of years of playing with that little radio for me to figure out that if I snuck outside and listened to the in-dash radio in my father’s Chevy, without starting the car and giving myself away of course, broadcasts from faraway places like New York City, Chicago and on rare occasions Florida, Georgia, Tennessee and other places I had never visited, were right there at my finger tips.

It also didn’t take long for my father to find out why the battery in his car had suddenly died. This was followed by a calmly delivered, yet lengthy and technically detailed lecture from my father, an electrician, on the effects of using a car battery without doing anything to charge said battery.”

Continue reading the full article at The Buffalo News…

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Bill solves the CRI echo mystery

Earth

A few days ago, I posted an article about Bill Meara (producer of the SolderSmoke Podcast) who was hearing audio echoes on his home brew regenerative receiver.

Bill has now solved this mystery (hint: it’s all about the receiver):
http://soldersmoke.blogspot.com/2014/09/radio-china-international-echo-mystery.html

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Hearing echoes on China Radio International

Earth

Bill Meara, producer of the popular SolderSmoke Podcast, recently recorded audio echoes on a couple of his home brew regenerative receivers.  Bill posted the following video, of his regen receiver tuned to China Radio International:

After Bill measured the echo delay at .133 seconds, he believes one possibility is that they originate from a propagation opening much like Lyle recorded on a 10 meter band opening last year (click here to listen to the audio and read the post).

A few days later, Bill recorded a similar echo effect while tuned to Brother Stair (Overcomer Ministries) on a different regenerative receiver. Click here to read the post and view the video.

The fact that Bill measured a .133 second delay (the amount of time it would take for a signal to circle the globe), makes me believe he’s hearing an echo similar to Lyle. But I must admit, I’m a bit amazed that a faint AM echo could penetrate blowtorch signals like CRI and Brother Stair’s relay generate State side.

Readers: What’s going on here? Is Bill catching rare propagation openings–or perhaps ducting in the Earth’s magnetosphere and ionosphere–or is there another explanation?

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Victor Goonetilleke: The joy of DXing

SX-99-DialVictor Goonetilleke has kindly shared a passage he recently posted to Facebook. Victor pretty much sums up why I still listen to the shortwaves:

“For almost four score and 5 I enjoyed shortwave radio. Yes I was a DXer, and a dedicated listener. The thousands of hours of broadcasts I listened from the BBC, VOA, RNW, DW, RFI, Swiss Radio, NHK and many more of the international broadcasters influenced me over the years. The knowledge I gathered was transferred to hundreds of homes as I taught my students in class rooms and as a lecturer too in higher Colleges, in many social gatherings, day to day conversations with important people and everyday folks, what I gathered from my radio made them realize that there was a story out there.

And as the years went by one by one those stations started to go away and I became more and more a DXer and finally I have only those signals to bring me joy.

Tonight would you blame me for being a DXer, abandoned by the international broadcasters, if I sit back and enjoy this music through the crackle of shortwave and happy that I have a radio which few seems to understand these days.”

You can listen to the recording Victor made by clicking here: https://app.box.com/s/tcryw2ymt38gz8y6zaw4

I would also encourage you to read Victor’s guest commentary on BBG Watch which was prompted by the BBG pulling the (shortwave) plug on much of Asia.

Finally, in 2003, Jonathan Marks interviewed Victor Goonetilleke; you can watch the full interview below:

Visit with Victor Goonetilleke 2003 from Jonathan Marks on Vimeo.

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Hearing the speed of light: DX double echo

ionosphere-earth-radio-wavesTwo weeks ago, at the W4DXCC conference in Tennessee, I met Lyle Juroff (K9FIK). Not only did I find that Lyle and I had many radio interests in common, but he also told me a story about hearing, recording and analyzing a double echo on the HF bands. I asked if he would explain in an email and include the recording so that I could share it on the SWLing Post. He kindly agreed!

Lyle writes:

I worked a DX station [9A1A] on 10 meters this past spring.  As the band improved, I heard an echo develop on his signal and guessed it might be long path so I began recording the audio.   I then began to hear a double echo and looked at the waveform on AUDACITY.  The timing marks on AUDACITY indicated 140 milliseconds between echos.

I went to Wolfram Alfa, one of my go-to sights for things I can’t remember, and looked up the earth circumference.  It not only gave me the distance but also the time to travel it at the speed of light,  133 milliseconds.   Not sure if everyone working DX has heard this sort of thing, I played the recording at the next East Tennessee  DX Association meeting.  Nobody said they had heard that kind of double echo.

Click here to download an mp3 of Lyle’s recording or simply listen via the embedded player below (note that the second recording is .WAV format):

Have you heard a double echo this profound? Please comment.

Many thanks to Lyle (K9FIK) for sharing his story!

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