Category Archives: Digital Modes

Kyodo News Radio Fax on the passing of Seiji Ozawa

Many thanks to SWLing Post contributor, Carlos Latuff, who shares the Radiofax news report (above) from Kyodo News Agency and his amazing artwork (below) detailing the news and his Radiofax reception. Carlos writes:

This time, the main headline of Kyodo News Morning Edition it’s about the passing of the world-renowned conductor Seiji Ozawa.

Carlos: Expect the unexpected in a Kyodo News Radiofax

Many thanks to SWLing Post contributor, Carlos Latuff, who shares the Radiofax news report (above) from Kyodo News Agency and his amazing artwork (below) detailing the news and his Radiofax reception. Carlos writes:

Expect the unexpected from the pages of today’s Kyodo News Morning Edition (first two pages).

Few headlines:
281 landslides caused by Noto quake, Hamas demands full withdrawal – Gaza truce proposed by 4 nations including US, massive attack in Ukraine, 12 people injured after being bitten by a dog, contaminated water leaks from Fukushima Daiichi, etc…

A Laptop and MixW software give Carlos cleaner Radiofax imaging

Many thanks to SWLing Post contributor, Carlos Latuff, who writes:


Now I’ve a notebook computer, and I can decode the Kyodo News radiofax signal accurately.

Unfortunately, unlike Fldigi, the MixW software doesn’t have the option to save the image, which forces me to make print screens, paste them into a graphics program and save them as an image. Still, the result is perfect (see image above].

Attached the NX Japan Navigational Warnings, with translation done by the Google Translator app.

For documentation purposes, I saved the decoding in vídeo:

Wow, Carlos! It does make a huge difference when you’re not relying on acoustic coupling for the decodes. Obviously MixW is a very capable Radiofax decoding system as well. I’m surprised it can’t automatically save images, though. Thank you for sharing!

Kyodo News Radiofax: Japan Navigational Warnings

Many thanks to SWLing Post contributor, Carlos Latuff, who shares the Radiofax news report (above) from Kyodo News Agency and his amazing artwork (below) detailing the news and his Radiofax reception:

Carlos notes,

“One thing is certain. Anyone who follows Kyodo News via radiofax and, especially, the navigational warnings, never dies of boredom!”

No kidding, Carlos. That’s scary stuff for those making way through the Gulf of Aden.

Thank you for sharing!

Carlos captures a number of Radiofax decodes with his XHDATA D-808

Many thanks to SWLing Post contributor, Carlos Latuff, who shares these recent Radiofax decodes on Twitter:

Hey Thomas my good man, have a look how good were the NOAA radiofax reception in Urca Beach, Rio de Janeiro, from USCG radio stations in Pt. Reyes, Boston and Honolulu:

Patrizio seeks information about mystery signals he’s discovering across the HF bands

Many thanks to SWLing Post contributor, Patrizio Cardelli, who has discovered some interesting signals on the HF bands and is seeking information about them.

A little background: Patrizio asked me about these signals a few weeks ago and based on a quick glance at the spectrum and waterfall images I assumed it was DRM (Digital Radio Mondiale). I was wrong, of course. Had I looked at the actual frequency and bandwidth, I would have immediately realized is was not DRM. My email load has been so heavy as of late, and my time to reply at such a premium, I rushed through the reply–my apologies, Patrizio!

Patrizio followed up with this message:

Hello Thomas,

I hope this message finds you well. I wanted to share my recent radio exploration based on your advice. I followed your suggestion and investigated a sample signal within the 60-meter band, specifically settling on the one at 4.962 kHz.

I attempted to decode it using the Dream software but encountered no success. It seems this isn’t a Digital Radio Mondiale (DRM) transmission. To rule out local QRM (interference), I tested various Kiwi SDR receivers across Europe, both to the south and north of my QTH. Interestingly, I managed to pick up this signal everywhere, with a stronger intensity noted in the northern locations.

I’m eager to publish this article to find out if other Shortwave Listeners (SWL) have been able to decode this transmission. Additionally, I’d like to mention that similar signals, either continuous or intermittent, are present on various HF frequencies.

I look forward to any insights or experiences others in the community might have regarding this intriguing signal.

Audio sample:

While I recognize these signals now, and I’m sure most of you who cruise the bands have seen/heard these as well, Patrizio is a relatively new SWL, turns out, and I thought it might be fun exploring just what these signals are. 

Readers: If you know what these signals are, please comment. Indeed, I’m sure there are a number of SWLing Post readers who have hands-on time with generating these signals as well in a past life or current career. Let’s explore!