Category Archives: Shortwave Radio

Tudor demos his portable Raspberry Pi-powered AirSpy HF+

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Many thanks to SWLing Post contributor, Tudor Vedeanu, who has kindly shared details about his portable Raspberry Pi system which now can run the AirSpy HF+ SDR.

Tudor writes:

I bought the RPi to use it as a Spyserver for my Airspy HF+ SDR.

My main radio listening location is a small house located on a hill outside the city and there is no power grid there (it’s a radio heaven!), so everything has to run on batteries and consume as little power as possible.

My first tests showed that the Raspberry Pi works very well as a Spyserver: the CPU usage stays below 40% and the power consumption is low enough to allow it to run for several hours on a regular USB power bank. If I add a 4G internet connection there I could leave the Spyserver running and connect to it remotely from home.

Then I wondered if the Raspberry Pi would be powerful enough to run a SDR client app. All I needed was a portable screen so I bought the official 7” touchscreen for the RPi.

I installed Gqrx, which offers support for the Airspy HF+. I’m happy to say it works better than I expected, even though Gqrx wasn’t designed to work on such a small screen. The CPU usage is higher than in Spyserver mode (70-80%) but the performance is good. Using a 13000 mAh power bank I get about 3.5 hours of radio listening.

I made a video showing how it works:

Click here to view on YouTube.

This is fantastic, Tudor. Thanks for taking the time to put together a video for us. I’ve just ordered the latest Raspberry Pi 3 (Model B+). It has slightly more horsepower than the previous Pi3. Tudor, you’ve inspired me to grab the 7″ touch display as well and try my hand at running the AirSpy HF+ portable.

I’m not sure if the Raspberry Pi 3 will be able to record spectrum without hiccups, but it’s certainly worth a try.

As you tweak your system, please keep us in the loop!

WUNC on Jazz: “America’s Coolest Weapon During The Cold War”

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Willis Conover, The Voice of America (Source: Wikimedia Commons)

(Source: WUNC’s The State of Things via Kim Elliott)

During the Cold War, the U.S. Department of State sent jazz musicians around the world to sell the American way of life. This initiative took place in the 1950s, during segregation and the beginning of the civil rights movement. Jazz was gaining popularity on the international stage partly because of a Voice of America program hosted by Willis Conover, and partly because jazz musicians, like Louis Armstrong, played international tours.

The U.S. government took note of this popularity and decided to send musicians as representatives of the country, even as those representatives didn’t have the full benefits of the freedom they were touting. Many of these multi-racial, multi-gender groups were not allowed to perform within the boundaries of the United States due to Jim Crow.

Host Frank Stasio talks to Hugo Berkeley, director of the new documentary “The Jazz Ambassadors: The Untold Story of America’s Coolest Weapon in the Cold War.” Historian Adriane Lentz-Smith joins the conversation to put the story of the jazz ambassadors into context. Lentz-Smith is a professor of history at Duke University who served as an advisor to the documentary. She’s also the author of “Freedom Struggles: African Americans and World War I” (Harvard University Press/2011). “The Jazz Ambassadors” screens at the Full Frame Documentary Film Festival in Durham on Sunday, April 8.[…]

A Yaesu WIRES-X SWL Net?

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The WIRES-X Network (Source: Yaesu)

Many thanks to SWLing Post contributor, Dave Zantow (N9EWO), who asks:

How many of you Amateur Radio folks reading this web page have WIRES-X capability (either with a local node on your own or have access to it via a repeater) ?? I ask this as a possibility of a casual net of some kind ? We have WIRES-X (local node) here and would be willing to at least try a test run of a weekly or semi weekly “SWL – Receiver Net” IF we receive enough feedback (even if only a few readers). So I would appreciate an email back with a thumbs up or down to this idea and that you would be at least a check in ? Also please give me ideas when you would think a good day of the week and time would be (USA) ? If I receive zero feed back, of course I will not waste my time (but I think it would be fun to at least give it a try).

I only recently acquires a WIRES-X capable handheld: the Yaesu FT2DR. Now I need to find out if there is a WIRES-X capable repeater I can hit from my home. Of course, for me it’s always finding a reliable time to meet–that’s the real challenge! Great idea, Dave!

Post Readers: Contact Dave if you’re interested–his email can be found at the top of his homepage.

XHDATA D-328: Want a free or half-price review unit?

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The folks at XHDATA have reached out to me with a deal for SWLing Post readers who live in the US and have an account with Amazon.com.

They have just introduced an inexpensive portable radio, the XHDATA D-328, and are looking for new reviews on Amazon.com.

The first ten SWLing Post readers to contact them will get a free D-328. The next ten readers will get a 50% off coupon code.

Simply email XHDATA at [email protected], mention that you’re an SWLing Post reader in the US and that you would like a XHDATA D-328 review unit. Note that this is the weekend, so you might not receive a reply from XHDATA for a couple of days.

The total price of the radio is only $13.80 at present.

If XHDATA offer a similar deal for readers in other countries, I will certainly post it here!

Perhaps this goes without saying, but If you get a free or discounted radio I would suggest that you mention this fact in the Amazon.com review and don’t hesitate to offer your frank thoughts and opinions.

Good luck! If you snag a D-328, please also consider commenting with your review here as well. I have one on order as well, but might not get to a review very quickly due to my schedule.

Interval Signals + Radio Astronomy = Bliss

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Yesterday, I spent part of the better part of the day at the Pisgah Astronomical Research Institute (PARI): a place that has begun to feel like a home away from home.

As you might imagine, radio astronomy observatories are places with very low levels of radio frequency interference. Since I had a few hours on the PARI campus to play radio, I used it as an opportunity to evaluate the CCRadio-EP Pro‘s AM/mediumwave performance.

For comparison purposes, I packed the CCRadio-EP Pro, Tecsun PL-660 and (for kicks) my Sony ICF-5500W.

Now isn’t the ICF-5500W a handsome boy?

I’ll post some of the CCRadio-EP Pro videos in my final review.

Though it was immense fun tuning through the AM broadcast band right through the gray line,  being an SWL, I eventually turned to the shortwaves. The only shortwave radio I had on hand was the amazing little Tecsun PL-660. Conditions weren’t as bad as I had expected–propagation was decent and did I mention no noise?

After tuning around a bit, I happened upon one of my favorite interval signals: that of the Voice of Turkey.

Everything around me–all that was on my mind–simply took a backseat to the simple pleasure of listening to an interval signal on a cool, foggy spring evening surrounded by the beauty of PARI’s campus and those giant radio telescopes.

Though the feeling was nearly impossible to capture, I did make a recording to share with SWLing Post friends and readers from around the world. I hope you enjoy:

Click here to watch on YouTube.