Category Archives: Recordings

Tom’s field portable HF antenna snags VOK’s summit broadcast

Tom’s field portable car roof HF antenna.

Many thanks to SWLing Post contributor, TomL, who shares a recording he made of the Voice of Korea on June 14, 2018. This English broadcast focuses on the Singapore summit and is, no doubt, historic in its content. [Note that we’ve posted other recordings on the Shortwave Radio Audio Archive.]

TomL notes:

Recorded on my noisy Lenovo laptop, SDRPlay RSP2, and an unamplified 18.5 foot antenna on the roof of my SUV.

I’m most impressed with the quality of his recording–VOK is not the easiest station to snag in the US midwest:

Click here to download the audio recording.

Thank you for sharing, Tom! I love your field portable vertical–obviously, it’s doing a fine job and your car must make for a decent ground plane!

Video: Moshe captures an echo in Radio Kuwait signal

Many thanks to SWLing Post contributor, Moshe Ze’ev Zaharia, who submits the following videos of his reception of Radio Kuwait at 10:30 UTC on April 6, 2018 from his home in Israel.

Moshe notes that the signal was of blowtorch strength and, for at least 45 minutes, there was an ever-present delay/echo. Moshe’s receiver is a (beautiful!) Zenith Trans-Oceanic T600 and his antenna a 15 meter wire:

Click here to view on YouTube.

Click here to view on YouTube.

Click here to view on YouTube.

Many thanks for sharing, Moshe!

Did anyone else note this echo? I wonder what happened at the Radio Kuwait transmitting station to make this happen?  Or, perhaps, it was a fault with the audio feed they received? Please comment!

Interval Signals + Radio Astronomy = Bliss

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.

Treasure hunt: Seeking Somali radio recordings from 2010

Okay SWLing Post readers:  I need you to dig through your off-air recordings for something pretty obscure…

Over at the Shortwave Radio Audio Archive, I frequently receive inquiries from educators, researchers, historians, and enthusiasts looking for very specific off-air recordings, often for some worthy project or other.  It’s quite a thrill when I can lay hands on just what’s being sought in our rather deep recordings archive.

I recently received just such an inquiry from producer Meghan Keane at NPR, and though we were not able to provide immediate help, I’m quite intrigued by the subject and thus not quite ready to give up the search.  Meghan writes:

My name is Meghan Keane and I’m a producer for NPR’s Invisibilia. I’m working on a story about Somalia and music, and am currently looking for some archival sound.

Around 2010, many radio stations in Somalia broadcasted animal noises and gun shot noises to protest Al-Shabab. I am hoping to find audio of that to use in my story. Please let me know if you have any leads!

Fascinating stuff.  I do recall a news story about Somali radio broadcasts including animal and gun shot noises back in the day, but I never actually heard a broadcast on shortwave or mediumwave.

Post readers: Can you help Meghan track down such a recording? If you can, please comment and/or contact me!

Results: AirSpy HF+ vs Elad FDM-S2 Weak Signal Comparisions

Looking north toward Cape Lookout, Oregon, near the site of my SDR receiver recordings. Photo courtesy of Wikimedia Commons.
In my original article 10 days ago, I set up a SWLing Post reader poll to let you give your opinion on which shortwave recordings within four pairs of audio files provided the most intelligible result. The recordings were intentionally noisy, low-level signals to help us discover–through critical listening to the files–if there is a clear favorite between the AirSpy HF+ or the Elad FDM-S2 receivers. Of course, there were only four pairs of recordings…not a very large sample size.

However, 34 readers of the original article took the time to listen and respond, so let’s get to the numbers, shown in these graphs:

Interestingly, the responses above seem to point to:

  • Two recording pairs tied in the results (50% / 50%) or were very close (HF+ 52.9% / FDM-S2 47.1%)
  • The FDM-S2 led one recording pair by a large margin (67.6% / 32.4%)
  • The HF+ led another recording pair by an equally large margin (67.6% / 32.4%)

Taken as a whole, no obvious winner emerged, although one might conclude the HF+ has a slight edge due to its lead in the “very close” recording pair of 7.230 MHz.

One thing is clear–the AirSpy HF+ is a surprisingly good performer for its price of $199 USD! For many enthusiasts this will be all the SDR they need.

As a final note, I’ll mention that the AirSpy HF+ used for the tests was totally stock. I have not yet performed the “R3 Bypass” mod nor the firmware update to my HF+ units. The simple R3 Bypass, discussed at length on the AirSpy Groups.io forum, significantly boosts sensitivity of the HF+ from longwave up to about 15 MHz, without any noted overload issues. For more on this modification from a MW DXer’s perspective, read Bjarne Mjelde’s insightful article at his Arctic DX Blog.

Thank you to all the readers who took the time to listen to the SDR recordings in this comparision and register your opinions.

Guy Atkins is a Sr. Graphic Designer for T-Mobile and lives near Seattle, Washington.  He’s a regular contributor to the SWLing Post.

Report from the 2017 Radio Preservation Task Force meeting

SWLing Post readers might recall that, last year, I had the distinctly great honor of presenting at the 2017 Radio Preservation Task Force meeting at the Library of Congress.

Several readers have asked me to share my experiences at the conference, so I’ll note the conference highlights here.

I attended all three days of the conference. The first day (Thursday, November 2) was held at the Woodrow Wilson Center and focused on Cold War broadcasting. It goes almost without saying that this was absolutely fascinating.  I learned a great deal. One of the day’s recurrent discussion themes, for example, focused on the keen awareness of those inside the Iron Curtain that they had been regularly subjected to propaganda.  In other words, the Cold War somehow created very discerning news listeners savvy enough to separate fact from fiction quite skillfully––an ability that many fear may (unfortunately) be eroding among today’s media audiences.  

That afternoon, SWLing Post reader, Phil Ewing, took me on an amazing tour of NPR’s new headquarters [thanks SO much, Phil!].


Later that afternoon at NPR, I attended an event celebrating NPR’s founding father and mission creator, Bill Siemering.  Bill and I co-presented at the Winter SWL Fest in 2011, and I admire him greatly both as a journalist and as an individual; I particularly enjoyed the opportunity to be at this event held in his honor.

Friday and Saturday sessions were held at the Library of Congress and were equally riveting as they covered nearly every aspect of radio preservation.

Here’s our panel just a minute before the forum began.

I was on the Digital Curation panel along with Charles Hardy (West Chester University and National Council on Public History), Jonathan Hiam (New York Public Library), Matt Karush (George Mason University and Hearing the Americas), Elena Razlogova (Concordia University) and Mark Williams (Dartmouth College and Media Ecology Project).

The discussion was dynamic, and to my pleasure, our Radio Spectrum Archive was quite the hit. The sincere interest in this project was beyond encouraging.  Indeed, after my presentation, I wasn’t able to address all of the questions from those in the audience because there were so many in line to speak to me about it; eventually the LOC had to re-arrange the room for a televised event, the 50th anniversary of the Public Broadcasting Act.

But there’s more.  And it’s a great ending to our story, which is really only a beginning: via Alex Stinson with the Wikimedia Foundation, I was introduced to the Internet Archive team last month, whom, to our profound delight, has wholeheartedly agreed to support the Radio Spectrum Archive by giving us nearly unlimited space to store our massive collection of spectrum files.

In a word?  This conference was brilliant. There simply couldn’t have been a better outcome for the Radio Spectrum Archive and I enjoyed every minute of it.

Many thanks to the entire RPTF team, especially Director, Josh Shepperd, for putting this spectacular event together.

I’ve been invited to a couple other archive conferences as a result of the RPTF meeting, and I’ll give these some consideration.  Regardless, I know this: I’ll make room in my schedule for the next RPTF conference. No way am I missing it!

And at the next conference I look forward to speaking to each one of those people with whom tight scheduling prevented my speaking at this one. After all, it’s this kind of enthusiasm that assures the Radio Spectrum Archive’s future.

If you’d like a more in-depth report of the RPTF conference, check out this article in Radio World (via Richard Langley). If you’d like to learn more about the Radio Preservation Task Force, check out their website by clicking here.

Many thanks to my buddy, Bennett Kobb, who also gave me a tour of the brilliant LPFM station, WERA (96.7) in Arlington, VA–what an incredibly dynamic station and staff!

Ulysses E. Campbell (left) and Bennet Kobb (right) in the studios of WERA.

I’d also like to thank my friend Kim Elliott for generously hosting me during the multi-day event. Even modest accommodation in the DC area is very expensive–no doubt, Kim’s hospitality made the conference a reality for me. Thanks again, Kim!