Monthly Archives: April 2014

AirChat: Long-distance digital communications via radio

AirChatLogo-001Last month, I was interviewed by NK News regarding the possibility of using inexpensive SDR dongles as a means for citizen journalists to receive and potentially send information across the North Korean border. Of course this is possible: digital communications over radio is becoming easier and more accessible all of the time.

While not yet as portable as an SDR dongle, Anonymous is developing a tool called AirChat which will allow long-distance communications via radio. AirChat borrows from Fldigi: a free application that decodes a variety of digital modes and has been used by amateur radio operators for years. Indeed, Fldigi is the same software you’ve used to decode broadcasts from VOA Radiogram and the new STF Radio.

Many thanks to the excellent  Southgate ARC news site for this article about AirChat:

(Source: Southgate ARC)

The International Business Times reports that the online hacktivist collective Anonymous has announced that it is working on a new tool called Airchat which could allow people to communicate without the need for a phone or an internet connection – it uses radio waves instead 

Initially the data mode software AirChat used code from ‘minimodem’ and then from ‘soundmodem’ sources but they say after suggestions from radio amateurs involved in the Amateur Radio Emergency Service (ARES), they decided to make it modular to use the Fldigi software, a broadly deployed solution for use with ham radios.

They say “So far we have played interactive chess games with people at 180 miles away. we have shared pictures and established encrypted low bandwidth digital voice chats. We have 3D printed over distances of 80 miles and transmitted medical orders at distances of over 100 miles.”

So far Yaesu FT-897D’s amateur transceivers have been used and the developers are also looking at using low-cost ($40) VHF/UHF handheld transceivers.

Read the International Business Times story 
http://www.ibtimes.co.uk/anonymous-airchat-aims-allow-
communication-without-needing-phone-internet-access-1445888


LulzLabs AirChat
https://github.com/lulzlabs/AirChat/

You can read about the goals of AirChat on their Github site and follow AirChat on Twitter with the hash tags #lulzlabs and #AirChat.

Anonymous has also posted the following video–a demo of AirChat:

Airchat from #lulzlabs on Vimeo.

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Radio Australia in NA: best times and frequencies on Saturdays?

ABC-GrandstandMy good friend, Rob De Santos, is trying to identify the best times and frequencies to hear Radio Australia across North America on Saturdays. Can you help him?

Rob writes:

“I am updating a page on my website with shortwave info on Radio Australia’s Grandstand coverage of Australian football. Typically this occurs on Friday night / Saturday morning US time (0330 to 1230 UTC Saturday, varies). As you all know, RA does not target North America and hasn’t for some time however some of the frequencies can be heard here.

I can tell you which ones I can hear in Columbus, OH but that doesn’t really give me much feel for all of the USA or Canada so I need your feedback. What is best in Vancouver, BC and Naples, FL are not likely identical and not at the same hours.

Which RA frequencies are best at your location between 0330 and 1230 UTC Saturdays? Are there particular hours better than others?

If you can [comment here] with the best frequencies and your QTH that would be terrific. The more geographic diversity and individual experience I can get the better advice I can give on the web page.

Thanks,
Rob de Santos”

Readers: if you can help Rob, please comment below.  Many thanks in advance!

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Virtual radio challenge: one year, one radio, one (very) remote island

SWL Travel Gear - Timbuk2 Wingman

Pack your bags! We’re going on a trip!

Shortwave listeners are interesting, creative people who do interesting, creative work: they’re scientists, veterans, corporate employees, students, retirees, volunteers, politicians, musicians, inventors, entrepreneurs, engineers, humanitarians, reporters, artists, researchers, sailors, pilots, pirates…and most seem to be travelers. But to say the least, they’re very diverse. The joy of the SWLing Post, for me, is the fascinating readers here and the great variety of questions and comments I receive from you.

On this blog, I often write about selecting the “right” radio for home, boating, preparednessoff-grid living, and of course travel–but sometimes I like to go through the mental exercise of imagining a scenario a little more extreme.

Indeed, I occasionally receive such “extreme” questions from our readers, questions that push the limits of the hobby, demanding highly specific needs in a radio. And, I readily admit, I thoroughly enjoy these questions!  They give me a chance–and good excuse, really–to be imaginative and innovative, to push beyond mere practical or monetary constraints to consider unique environments, weather conditions, durability needs, power requirements, and/or resource availability…great fun.

If you enjoy this kind of brain game, too, check out our virtual challenge that follows:

Should you agree to take it on, you’ll need to complete it within two weeks. Why the time constraint? Let’s imagine that your flight leaves May 15th, and you’ll need to make sure you’ve received, tested, and packed all of your supplies by that date.

[By the way, this scenario is based on an actual reader question.]

Here’s your challenge…

TristanDaCuna-001

Location: Edinburgh of the Seven Seas, Tristan Da Cunha, South Atlantic Ocean

Tristan da Cunha on 6 February 2013, as seen from the International Space Station (Source: Wikipedia)

Tristan da Cunha on 6 February 2013, as seen from the International Space Station (Source: Wikipedia)

Accommodation: A rented room in a native Tristanian family home

Electricity: Mains power via the grid, but you’ll have to expect extended power outages if there is a generator failure

Internet: The island has (slow speed) public Internet, but you will not have access at your accommodation

Your budget: $200 US–which must cover all of your radio requirements (radio, antenna, batteries, and all accessories)

Scenario: You’re on an assignment, being sent to one of the world’s most remote inhabited islands–Tristan Da Cunha, in the South Atlantic (see this overview of the island from Wikipedia)–to undertake research for one year. You’ll fly into South Africa, where you’ll board a cargo vessel for the one-week journey to the island. The maximum amount of luggage allowed by your airline is one carry-on and two check-in bags, both of no more than 60 kg (132 lbs), total.

Once on the island, you will not leave until a ship picks you up 365 days later.

Edinburgh of the Seven Seas, Tristan da Cunha, South Atlantic Ocean (Source: michael clarke stuff)

Edinburgh of the Seven Seas, Tristan da Cunha, South Atlantic Ocean (Source: michael clarke stuff)

Tristan Da Cunha has less than 300 total inhabitants, so while there are basic shops and accommodations, these are very limited. Once there, ordering a new radio or accessories will not be an option. Getting your rig fixed by an island electronics repair shop will be possible, to some extent (we’ll assume you don’t possess those repair skills yourself). Batteries are locally available, but very expensive…

You’ll be staying in a small, thick-walled stone cottage with a family and will have your own room, with a window.  The family will allow you to string a wire antenna outside, but there are no trees, only heath and shrubs. Additionally, winds are strong and rainfall substantial; sunshine can be quite limited.

We’ll assume you’re starting from scratch, that you have neither radio nor any accessories. You’re allowing yourself a maximum of $200 US for all of your radio gear.  Your goal is to have the best shortwave listening set-up possible for your budget and for this situation. Since your radio must be packed in your luggage, you can’t afford the space nor the weight of a large tabletop radio.

Obviously, the more you understand the island and its limitations, the better choices you’ll make for your gear.

Limitations:

  1. You’re limited to a (virtual) budget of $200 US to procure your supplies; ideally, this includes shipping costs
  2. You can select used gear, but must base your choices on reality (i.e., actually find item(s) online and document the price and time of availability). If you “shop” eBay, make sure you’re using the final price, not the current or opening bid. If you do locate something used on eBayQTH.com, QRZ.com or at Universal Radio, for example, include the link! (Just to add to the fun.)
  3. Your main objective is to listen to international broadcasters, and do a little DXing, of course. FM sensitivity will not be a factor (of course, I’m joking here!) Whether or not the radio has SSB mode is up to you.
  4. We’ll assume that you’re bringing a laptop computer with you.
  5. Remember, you’ll be stuck with this radio for one full year! So choose something you’ll love to operate, and don’t forget your vital accessories.

Note: The limitations of this exercise are simply to level the playing field for everyone as well as to make the challenge a little tougher (and thus more fun!). Of course, they’re open to interpretation, but do try to honor the spirit of the game.

Up to the challenge? You’ve got two weeks–!

GrundigG3To participate, just comment on this post with your suggested set-up, any links, and a brief explanation for your choices.

You’re also welcome to email me directly with your response.

We’ll select some of the most interesting and relevant responses and post them in two weeks, on Friday, May 9, 2014.

Have fun!  We can’t wait to read the responses…!

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Monitoring while recording on the Tecsun PL-660

BlueTooth

London Shortwave has discovered an innovative way to monitor broadcasts while recording from his Tecsun PL-660. He writes:

“Tecsun PL-660 doesn’t have a line out, which means that when recording from it one has to use a pair of headphones to listen to it simultaneously.

Most portable speakers I’ve tried generate tremendous amounts of RFI when connected directly to the receiver. I solved this problem by using TaoTronics BA-01 Bluetooth audio transmitter and a Bluetooth enabled portable speaker, together with a cable that splits the audio output into two, so the transmitter and the audio recorder can both be connected to the radio.

The recording [in this YouTube video] is of Radio Australia and was made in London, UK on 09/04/2014 at 1543 BST.”

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An open letter to the BBG

voa logoMany thanks to Keith Perron who shares his open letter to the Broadcasting Board of Governors Chairman, Jeff Shell.

Keith’s letter focuses on the importance of shortwave radio from the perspective of a broadcaster and of someone who has traveled to remote areas in Asia.

BBG Watch published Keith’s letter yesterday and featured it on their website.

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One more week to get your Shindig T-shirt at a discount

ShindigLogoWhiteRemember our announcement about the Shortwave Shindig T-shirt?

David Goren has extended his 10% discount to SWLing Post readers for one more week!

Simply enter the promotional coupon code “swling” at checkout. Total cost will then be $18 shipped!

Click here to order your shirt today!

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Chris field records NHK while traveling in Peru

Chris-Peru

SWLing Post reader, Chris, has just shared a recording of NHK World he made while traveling in Peru on Monday (April 21st, 2014).

Yes, that’s his photo above taken in the picturesque coastal town of Máncora. Can you tell I’m envious? 

Chris recorded this broadcast starting at 10:00 UTC on 9,625 kHz with a Sony ICF-SW7600G and using a Sangean ANT-60 antenna. The actual recording was made with Chris’ Sony ICD SX712 digital recorder and he uploaded it using a Dell Windows 8.1 (8 inch) tablet.

That, Chris, is a nice field recording combo!

Click here to download his recording as an MP3, or simply listen via the embedded player below. This recording will also be available on the Shortwave Radio Audio Archive.

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