Tag Archives: shortwave

Radiofax images of Typhoon Surigae from the Japan Meteorological Agency

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

Technology considered obsolete, the fax, or better, radiofax (transmitted by radio) continues to be used by several meteorological agencies around the world, which broadcast weather charts to vessels on the high seas. These two images were transmitted today by the Japan Meteorological Agency and received at 19h10 and 19h50 (UTC) in Porto Alegre, Brazil.

The first image is a photo from the Japanese satellite Himawari 8. Even with noise, due to the shortwave propagation, you can see clearly the “eye” of typhoon Surigae.

The second image is a typhoon alert, indicating on the map that Surigae has changed course and is now en route to the Pacific.

These two images were transmitted today by the Japan Meteorological Agency, on the frequency of 7795 kHz

Thank you for sharing this, Carlos. It’s amazing, the amount of information you can receive over the air even with modest equipment by today’s standards. With a modest portable radio and a little decoding software, anyone can grab images like this.

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Radio Northern Europe International Show #16

Many thanks to SWLing Post contributor, Roseanna, with Radio Northern Europe International who shares the following announcement:

Hei alle,

While the Norwegians are getting into Påskekrim (Easter Crime), the Swedish and Finnish kids are dressing up as Easter Witches and the Danes are making their Gækkebreve (Teaser Letters), we’ve created a jam-packed show for you this month with more guest spots, lots of great music and we have worked with Karl from scandipop.co.uk to bring you a song of the month!

For ease we’ve split the broadcasts into 3 versions;
• WRMI & On-Demand Version: RNEI 16 + RNEIxtra Mammas Mest Metal + Stephen’s feature + HamDRM.
• Channel 292 & Radio Onda version: RNEI 16 + HamDRM + This is an Express Music Show.
• World FM & Unique Radio version: RNEI 16 only.

RNEI #16 includes great music including:
• A new duo from Iceland who don’t want to be forgotten.
• Ku?ka’s & Four Night’s Latest.
• A great Danish song from Nana Jacobi.
• UNDER’s gorgeous chill-house remix of a famous Swedish song.
• A joik from Sweden’s Got Tallent’s winner Jon Henrik Fjällgren.
• Finland’s Heroines will be singing about their Rules.
• Scandipop.co.uk will be picking their song of the month for us to feature.
• The opening song to Mammas Mest Metal with the playlist encoded in MFSK 64 during.

A new RNEIxtra segment called Mammas Mest Metal is going to air for the first time this month on WRMI featuring a selection of Metal, Post Metal, Viking and Post-Prog Metal songs!

Afterward we’ll head over to Stephen to hear music from some sisters who sing in Welsh and Cornish, their music is beautiful!

Lastly We have a HamDRM data segment coded by Daz featuring a self rendering animation and our playlist. You can download an early alpha copy of Daz’s decoder, EasyDRF, here. Other options for HamDRM are: EasyPal & WinDRM on Windows and QSSTV &TRXAMADRM on Linux.

We are trialling some new beams this month to Asia and Africa!

Keep an eye on our announcements for extra broadcasts!

If you miss the show you can always catch up on demand and, if you prefer to only hear our music, we have Spotify Playlists of each show usually published after the first broadcast!

Happy Easter / God påske,

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Can you help Tom ID this CW transmission on 7039.60 kHz?

CW Spectrum

Many thanks to SWLing Post contributor, Tom (DF5JL), who writes:

At the end of last year it appeared for the first time: a telemetry transmitter in CW on 7039.60 kHz. It always transmits at the 2nd, 22nd and 42nd minute of every hour. Every day.
Reception reports are available from Germany, the Netherlands, France and Greece. Three numbers and a V are transmitted ten times in succession, as follows:

0522 UTC: 121V
0542 UTC: 121V
0622 UTC: 122V
0722 UTC: 123V
0822 UTC: 125V
0842 UTC: 127V
0902 UTC: 128V
0922 UTC: 129V

During the day the values increase, in the afternoon they decrease. It is assumed that voltage values are transmitted here, i.e. “121V” would correspond to 12.1 volts. You can listen to a recording here:

Any idea?

73 Tom

Thank you, Tom.

Post readers: If you can shed some light on these transmissions, please comment!

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Tecsun PL-330 tip: Using the telescopic antenna for the LW & MW bands

Many thanks to SWLing Post contributor, Mad Radio DXer, who writes:


I want to let you & your readers know of a Tecsun PL-330 trick that I saw mentioned in the comments section of your blog some time ago which does not seem to have a lot of awareness. This is for using the telescopic antenna for the LW & MW bands, & it works for the 3305 version of the PL-330 which I understand is the export version. The original comment I saw said this also works for the Chinese version of the PL-330, before firmware 3305.
It is very easy to do & instructions are the following…

1. Turn on the radio.
2. Select either the MW or LW band.
3. Press the number 3 key down for a few seconds, until the display shows “CH-S”.
This means the MW & LW bands can now be received with the telescopic antenna.
4. To use the ferrite bar again, press the number 3 key until “CH-A” appears on screen.

I also did a YouTube video showing this trick in action…

This reminds me of the trick used for the Degen DE1103 PLL version which allows reception of the telescopic antenna for the MW band. However, in my opinion this is much easier to use on the PL-330 than the DE1103 PLL which could be very fiddly. Also this trick is most effective on the LW band, as I find Chinese portables are usually very weak on this part of the band which is good news for LW DXers. I hope you & everyone reading find this trick very useful & that it works.

Thank you so much for the excellent tip!

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Radio Waves: WLW at 100, WWVB Upgrades, Ofcom Radio Amateur Data, and Unlocking the Airwaves

Radio Waves:  Stories Making Waves in the World of Radio

Because I keep my ear to the waves, as well as receive many tips from others who do the same, I find myself privy to radio-related stories that might interest SWLing Post readers.  To that end: Welcome to the SWLing Post’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Many thanks to SWLing Post contributors Mike Terry, Dave Zantow, and John Figliozzi  for the following tips:

WLW-AM Begins 100th Year On Air (WVXU)

It wasn’t Cincinnati’s first radio station, but WLW-AM is still the biggest.

Cincinnati industrialist Powel Crosley, Jr. began broadcasting WLW-AM over a 20-watt station from his College Hill home on March 2, 1922 – which means that the station is entering its 100th year today.

WLW-AM wasn’t Cincinnati’s first commercial radio station, but it is the oldest surviving station from the 1920s. WMH was operated by the Precision Instrument Co. from Dec. 30, 1921, to January 1923.  WMH was sold to Crosley and merged into WLW, says Randy Michaels, the former WLW-AM programmer and Jacor/Clear Channel executive who is the best radio historian I know.

In 1934, WLW-AM became “the Nation’s station” when President Franklin D. Roosevelt flipped a switch in the White House to activate the station’s unprecedented 500,000-watt experimental transmitter under its Tylersville Road tower. WLW-AM broadcast at “super power” around the clock for five years, through 1939, and continued the mega-wattage output midnight-2 a.m. until 1943. For years WLW-AM has boasted that the 50,000-watt signal reaches 38 states. (I’ve heard the station in New Jersey, Maryland, North Carolina, Florida, Georgia, Illinois and Missouri.)

For 99 years, WLW-AM has broadcast some of the most popular personalities in town: Jim Scott, Gary Burbank, Bob Trumpy, Marty Brennaman and Joe Nuxhall, Cris Collinsworth, Jim LaBarbara, Bill Cunningham, Mike McConnell and Dale Sommers. Before them came Ruth Lyons, Bob Braun, Doris Day, Rosemary Clooney, newsman Peter Grant, sportscaster Red Barber and comedian Red Skelton.

Although WLW-AM likes to promote itself as “news radio,” it’s perhaps best known for carrying Reds and most Bengals games, plus University of Cincinnati football and basketball and Xavier basketball.[]

WWVB broadcast system upgrades may include temporary outages (WWV)

The WWVB broadcast system is being upgraded with new equipment to improve the reliability of the signal. In order to install this equipment, beginning on March 9, 2021 the WWVB signal may be operated on a single antenna at approximately 30 kW radiated power for periods up to several days in duration, and may have occasional outages. Periods of reduced power operation lasting longer than 30 minutes will be logged on the WWVB Antenna Configuration and Power web page, and any outage longer than five minutes’ duration will be recorded on the WWVB Outage web page. Upgrades are expected to be complete by March 31, 2021.

Ofcom released age of radio amateurs data (Southgate ARC)

Following a Freedom of Information request about the age of radio amateurs Ofcom said they do not hold Date-of-Birth information for many radio amateurs but released what information they do have

Ofcom say “We do not hold a full breakdown of the age of issued amateur radio licensees as date of birth is not a mandatory field for licence applications.”

In September 2000 the then communications regulator (RA) abolished the ban on people under 14-years-old holding a Full amateur licence, since that time a person’s date of birth has served little regulatory purpose.

The data Ofcom released showed they only had Date-of-Birth information for:
7,312 out of 28,845 Foundation licences
4,104 out of 12,127 Intermediate licences
44,944 out of 54,072 Full licences

As of March 1, 2021 there was a total of 95,044 valid UK amateur radio licences.

Download the FoI reply and the available age data at

You can submit a Freedom of Information request to Ofcom online at

Unlocking the Airwaves (UMD)

Unlocking the Airwaves: Revitalizing an Early Public and Educational Radio Collection is a comprehensive online collection of early educational public radio content from the National Association of Educational Broadcasters (NAEB). The forerunner of CPB and its arms, NPR and PBS, the NAEB developed and distributed educational radio programs and accompanying print materials to schools and communities across the United States. What’s more, the NAEB lobbied extensively to unlock the airwaves—to access precious frequency space—in order to bring the voices of poet Robert Frost, architect Frank Lloyd Wright, anthropologist Margaret Mead, and conservationist “Ranger Mac,” among many other individuals, into American homes and classrooms.

The NAEB’s history is the dramatic story of idealists who believed in the utopian possibilities of technology for education and social uplift and who faced considerable challenges in pursuit of those goals, including economic depression, world war, and the scarcity of the electromagnetic spectrum. It’s a story that has much to tell us about 20th century American culture, as well as the 21st century’s environment of online educational technology and podcasting that we live in today.

Despite its historic importance and contemporary relevance, most of the NAEB members’ programs were never heard again after their initial brief moments on the air. The archives for the radio programs and their related paper documentation have been split for over 25 years between two institutions: the University of Maryland and the Wisconsin Historical Society. Unlocking the Airwaves reunites the split collections, finally realizing the potential of the collections of the NAEB for exploration and and the broader public.

Click here to explore Unlocking the Airwaves.

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Radio Northern Europe International Show #15

Many thanks to SWLing Post contributor, Roseanna, with Radio Northern Europe International who shares the following announcement:

Hei alle,

We have put together a packed show for March for all the wonderful RNEI listeners ?

We’ve got lots of extras including:

 Folk listening on-demand ? and on WRMI ? will get to hear a pretty piece of music from the game Unravel TWO along with a Feature from our new guest presenter, Stephen who also presents 16 Gwendoline Street on 9510KHz, 12:30UTC Sundays!

 Listeners tuned to Channel 292 or Radio Onda ? will get to hear another instalment of This is an Express Music Show featuring fantastic music and some MFSK 64 data!

 For those listening on shortwave ?: HamDRM data at the end of the show (292 & Onda) / hour(WRMI) & Comb Stereo encoding allowing a stereo version of the show to be heard over shortwave with a simple plugin, no special equipment needed! (https://rnei.org/stereo)

 For everyone: Some MFSK 64 data and fantastic show presented by me with music like:
 A haunting song from iris ?.
 Some cute Finnish ?? music.
 An Icelandic ?? bop.
 A massive Sea Shanty ?.
 Some pretty video game ? music.

Coverage Predictions

This is the last of the Winter times, Our summer schedule will be announced soon ?

You can find our full up to date frequency schedule here: (https://rnei.org/listen)

Can’t tune into a radio or just want the music without the extras? We also have Spotify Playlists of all of our broadcasts available here: RNEI Spotify Profle with the latest show being added a few days after broadcasting!

Wishing you all the best for this month and look forward to hearing from you again,

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