Tag Archives: Digital Radio Mondiale

Radio Waves: WRMI Damaged by Ian, VOK Podcast, and North Korea Increases DRM

Radio Waves:  Stories Making Waves in the World of Radio

Welcome to the SWLing Post’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!


Shortwave Station WRMI Damaged by Ian (Radio World)

The vast Okeechobee, Fla., antenna farm of privately-owned WRMI, which transmits programming to the world via shortwave radio, was hit hard by Hurricane Ian.

WRMI has 14 transmitters and 23 antenna systems. “We had winds up around 100 miles per hour, and that did a real number on our antenna field,” said Jeff White, general manager of WRMI.

“So far we have three antennas that are probably destroyed beyond repair: one to Europe, one to Africa and one to Central America and the South Pacific.”

As pressing as rebuilding these three antennas is for WRMI, “The biggest job we have at the moment is putting back up dozens of telephone poles that carry the transmission lines from the transmitter building to the antennas,” said White. [Continue read at Radio World…]

>>–Click here to donate to WRMI’s Hurricane Relief Fund.–<<

Voice of Korea programming available as a podcast

Many thanks to SWLing Post contributor, Alex, who notes that some of VOK’s language services are now available in podcast form. If you wish to hear some old school propaganda in high fidelity, this is a good way to do so: check it out on Castbox.

North Korea Doubles Digital Radio Output (Red Tech)

After years of experimentation, the famously secretive nation has switched on another DRM shortwave transmitter. The big question: Why?


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Radio Waves: Fast Radio Bursts, Czechia DRM AM Trial, Kumartuli Radio Shop, and Ekho Moskvy Off Air

Radio Waves:  Stories Making Waves in the World of Radio

Welcome to the SWLing Post’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!


Astronomers detect a radio “heartbeat” billions of light-years from Earth (MIT)

The clear and periodic pattern of fast radio bursts may originate from a distant neutron star.

Astronomers at MIT and universities across Canada and the United States have detected a strange and persistent radio signal from a far-off galaxy that appears to be flashing with surprising regularity.

The signal is classified as a fast radio burst, or FRB — an intensely strong burst of radio waves of unknown astrophysical origin, that typically lasts for a few milliseconds at most. However, this new signal persists for up to three seconds, about 1,000 times longer than the average FRB. Within this window, the team detected bursts of radio waves that repeat every 0.2 seconds in a clear periodic pattern, similar to a beating heart.

The researchers have labeled the signal FRB 20191221A, and it is currently the longest-lasting FRB, with the clearest periodic pattern, detected to date.

The source of the signal lies in a distant galaxy, several billion light-years from Earth. Exactly what that source might be remains a mystery, though astronomers suspect the signal could emanate from either a radio pulsar or a magnetar, both of which are types of neutron stars — extremely dense, rapidly spinning collapsed cores of giant stars.

“There are not many things in the universe that emit strictly periodic signals,” says Daniele Michilli, a postdoc in MIT’s Kavli Institute for Astrophysics and Space Research. “Examples that we know of in our own galaxy are radio pulsars and magnetars, which rotate and produce a beamed emission similar to a lighthouse. And we think this new signal could be a magnetar or pulsar on steroids.”

The team hopes to detect more periodic signals from this source, which could then be used as an astrophysical clock. For instance, the frequency of the bursts, and how they change as the source moves away from Earth, could be used to measure the rate at which the universe is expanding. [Continue reading…]

CRA Runs DRM Digital AM Trial in Czechia (Radio World)

Transmission company CRA looks at possibility for reusing analog transmission facilities

Czech transmission services company ?eské Radiokomunikace (CRA) is testing the DRM medium-wave digital radio system on 954 kHz.

According to a tweet from Marcel Prochazka, director of legal and regulatory affairs for CRA, the transmissions are originating from ?eské Bud?jovice in South Bohemia and operating at a power of 3.16 kW from a 107-meter HAAT antenna. Continue reading

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Radio Waves: DRM Demo in Australia, Decoding the JWST, the ARDC, and EV Makers Dropping AM Radio

Radio Waves:  Stories Making Waves in the World of Radio

Welcome to the SWLing Post’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!


Australia Demonstrates DRM on AM, FM (Radio World)

Since September 2020, ABC Radio has been quietly trialing DRM technology in Victoria

The public-service Australian Broadcasting Corp. and its transmission contractor BAI Communications Transmission Network hosted a public demonstration of Digital Radio Mondiale broadcasts on June 29, 2022. ABC highlighted the use of DRM on both AM and FM in Wagaratta, Victoria.

According to the DRM Consortium, the demonstration was the culmination of almost two years of COVID-impacted work to assess the performance of DRM services in Australia’s VHF and medium-wave bands.

Previously, the Australian Amateur Radio Experimenters Group reported that AREG member Steve Adler (VK5SFA) had been monitoring “a very un-publicized Digital Radio Mondiale (DRM) trial” on 747 kHz from Wangaratta in August 2021.

The Australian Communications and Media Authority provided ABC with a license variation to conduct the DRM 30 trials from September 1, 2020, to August 31, 2022.

At the public demonstration, senior representatives from the public, commercial and community radio sectors, along with regulators and other interested parties, were able to hear and see the capabilities of DRM broadcasting on AM from Dockers Plains and on FM from Mount Baranduda. They were also able to review the transmission equipment at Wagaratta.[Continue reading…]

Also check out the DRM Consortium’s article on this same topic.

Decoding James Webb Space Telescope (Daniel Estévez)

The James Webb Space Telescope probably needs no introduction, since it is perhaps the most important and well-known mission of the last years. It was launched on Christmas day from Kourou, French Guiana, into a direct transfer orbit to the Sun-Earth L2 Lagrange point. JWST uses S-band at 2270.5 MHz to transmit telemetry. The science data will be transmitted in K-band at 25.9 GHz, with a rate of up to 28 Mbps.

After launch, the first groundstation to pick the S-band signal from JWST was the 10 m antenna from the Italian Space Agency in Malindi, Kenya. This groundstation commanded the telemetry rate to increase from 1 kbps to 4 kbps. After this, the spacecraft’s footprint continued moving to the east, and it was tracked for a few hours by the DSN in Canberra. One of the things that Canberra did was to increase the telemetry rate to 40 kbps, which apparently is the maximum to be used in the mission.

As JWST moved away from Earth, its footprint started moving west. After Canberra, the spacecraft was tracked by Madrid. Edgar Kaiser DF2MZ, Iban Cardona EB3FRN and other amateur observers in Europe received the S-band telemetry signal. When Iban started receiving the signal, it was again using 4 kbps, but some time after, Madrid switched it to 40 kbps.

At 00:50 UTC on December 26, the spacecraft made its first correction burn, which lasted an impressive 65 minutes. Edgar caught this manoeuvre in the Doppler track.

Later on, between 7:30 and 11:30 UTC, I have been receiving the signal with one of the 6.1 metre dishes at Allen Telescope Array. The telemetry rate was 40 kbps and the spacecraft was presumably in lock with Goldstone, though it didn’t appear in DSN now. I will publish the recording in Zenodo as usual, but since the files are rather large I will probably reduce the sample rate, so publishing the files will take some time.

In the rest of this post I give a description of the telemetry of JWST and do a first look at the telemetry data. [Continue reading…]

Helping Secure Amateur Radio’s Digital Future (Hackaday)

The average person’s perception of a ham radio operator, assuming they even know what that means, is more than likely some graybeard huddled over the knobs of a war-surplus transmitter in the wee small hours of the morning. It’s a mental image that, admittedly, isn’t entirely off the mark in some cases. But it’s also a gross over-simplification, and a generalization that isn’t doing the hobby any favors when it comes to bringing in new blood.

In reality, a modern ham’s toolkit includes a wide array of technologies that are about as far away from your grandfather’s kit-built rig as could be — and there’s exciting new protocols and tools on the horizon. To ensure a bright future for amateur radio, these technologies need to be nurtured the word needs to be spread about what they can do. Along the way, we’ll also need to push back against stereotypes that can hinder younger operators from signing on.

On the forefront of these efforts is Amateur Radio Digital Communications (ARDC), a private foundation dedicated to supporting amateur radio and digital communication by providing grants to scholarships, educational programs, and promising open source technical projects. For this week’s Hack Chat, ARDC Executive Director Rosy Schechter (KJ7RYV) and Staff Lead John Hays (K7VE) dropped by to talk about the future of radio and digital communications. [Continue reading…]

Interference causes EV makers to drop AM radio (Radio World via the Southgate ARC)

Radio World reports the Electromagnetic Interference generated by Electric Vehicles is causing some EV automakers to drop AM (medium wave) radio

The article says:

Some EV automakers are dropping AM altogether due to audio quality concerns, but that’s just one piece of the puzzle as radio continues to fight for space on the dash.

“As carmakers increase electric vehicle offerings throughout their lineups, the availability of AM radio to consumers is declining,” said Pooja Nair, communications systems engineer with Xperi Corp., in a Radio World guest commentary. “This is because the effects of electromagnetic interference are more pronounced in EVs than in vehicles with internal-combustion engines.”

In other words, electromagnetic frequencies generated by EV motors occupy the same wavelength as AM radio signals. The competing signals clash, effectively cancelling each other out. As EV motors grow more powerful, AM static tends to increase.

Read the full story at
https://www.radioworld.com/news-and-business/headlines/why-are-some-automakers-ditching-am-radio


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Changes to KTWR’s DRM broadcast schedule effective 3rd July, 2022

Many thanks to SWLing Post contributor, Mangosman, who shares the following tip from Mike Sabin at KTWR via Alokesh Gupta’s blog:

Due to requests for later broadcasts, improved propagation, and the addition of a program, KTWR is changing its DRM broadcast schedule effective 3rd July, 2022.

KTWR Digital Broadcasts
DRM broadcasts (Effective 3rd July 2022):

Day Time(UTC) Frequency Coverage Area Language
—————————————————
Saturday 1100-1127 12000 kHz China English
Saturday 1128-1230 9910 kHz Japan Japanese, English
Mon-Fri 1215-1245 9910 kHz China Mandarin
Sunday 1500-1545 15205 kHz India English
Sunday 1600-1630 15390 kHz India South Indian languages

(Mike Sabin, KTWR)

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Jerome would like to know more about the Starwaves Truckbox DRM converter

Many thanks to SWLing Post contributor, Jerome van der Linden, who writes:

Hello Thomas,

Back in January 2019 you featured in SWLing an item about a portable DRM/DAB receiver produced by Starwaves GmbH.

It seems the same company had also produced a DRM/DAB to FM convertor for use in trucks and cars, as this Youtube Link shows:

Click here to view on YouTube.

It shows the unit tuned to 6095khz and later to 13810khz, with music being played, I assume via the converter and transmitted on a free FM frequency the car radio is tuned to.

The video also shows a couple of shots of the converter and remote control, and a second bit of hardware that I’m unsure of its function. This was all back in 2007, I gather. The comments from those that have seen the video are not I suspect from people familiar with SW listening, and the suspicion that a car whip antenna is entirely unsuited to SW reception should be questioned, as I had personal experience of this while in Saudi Arabia in 1990, where SW car radios were not uncommon, and strong signals provided perfectly acceptable audio quality. Sure, 1 metre long whip won’t be much good for SW DX, but who’s going to be doing that while driving a car?
Anyway, I’m curious to know if anyone has ever purchased a Starwaves Truckbox? I gather it is currently not available.

73s
Jerome van der Linden

Thanks for sharing this, Jerome. I, too, am curious if the Starwaves Truckbox made it beyond the prototype stage to be mass produced. Please comment if you have more info!

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Paul receives a Funklust DRM QSL

Many thanks to SWLing Post contributor, Paul Jamet, who writes:

Hi Thomas,

I am reacting to the latest Radio Waves news items on the SWLing Post:  Funklust is back on air with a boost

Connected to a Kiwi SDR installed in Portugal, I listened to this experimental station on its 15785 kHz DRM frequency and sent a listening report (in the form of an audio recording and a screenshot) to the Fraunhofer Institute in Erlangen, Germany:
[email protected]

I received a nice QSL!

Audio File:

KiwiSDR Screenshot:

The signal was picked up as far as New Zealand one told me. I think reception reports from all over the world would be very much appreciated …

Have a nice day. Best regards.

Paul JAMET
Radio Club du Perche

That’s brilliant, Paul. Thank you so much for sharing the recording and QSL info. Hopefully, they’ll continue to receive reports from across the globe. It might be fun, in fact, to see just how far one could DX this DRM broadcast via the KiwiSDR network. Frankly, good copy of Funklust’s 250W DRM signal in Portugal is pretty impressive!

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Radio Waves: Taiwan Radio Enthusiasts, ABC Radio Still Vital, Funklust DRM, and Democracy’s Reliance on Quality Information

Radio Waves:  Stories Making Waves in the World of Radio

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 contributor, Eric Jon Magnuson, who has been taking an active role in helping to curate our Radio Waves tips.


Taiwan radio enthusiasts tune in as Chinese, U.S. warplanes crowd sensitive skies (Reuters)

SYUHAI, Taiwan, May 24 (Reuters) – Shortly after dawn on a southern Taiwanese beach, Robin Hsu’s iPhone pings with the first radio message of the day from Taiwan’s air force as it warns away Chinese aircraft.

“Attention!” a voice says on the radio, speaking in Mandarin to a Chinese military plane flying at an altitude of 3,500 meters. “You have entered our southwestern air defence identification zone and are jeopardising aviation safety. Turn around and leave immediately.”

Taiwan, which China claims as its own territory, has complained for years of repeated Chinese air force missions into its air defence identification zone (ADIZ), which is not territorial airspace but a broader area it monitors for threats.

Although Taiwan’s Defence Ministry details these almost-daily incursions on its website, including maps outlining the activity, a band of Taiwanese radio enthusiasts like Hsu has been tuning in to related radio traffic and publishing the recordings online. [Continue reading…]

ABC’s oldest medium, radio, still vital in a world of streaming and podcasts (ABC News)

Thelma Denny doesn’t know life without the ABC.

Now 84, the resident of Apple Tree Creek near Bundaberg, was born six years after radio announcer Conrad Charlton announced to the country: “This is the Australian Broadcasting Commission.”

As a young girl, Thelma remembers her father “always had the radio on”, especially for the cricket or her mother’s favourite long-running radio drama Blue Hills.

These days the radio is her comfort and companion, especially since her husband, Ronald, died in 2016, two days after their 58th wedding anniversary.

Still living independently, the great-grandmother loves nothing more than to unwind with Phillip Adams talking from her bedside table each weeknight as she falls asleep.

But ABC radio is also her lifeline, so when her radio went on the blink, Thelma was at a loss.

“That’s been the problem, I can’t get an update on the weather,” she said.

“If there is a storm on, I have to turn off the television and the computer which has the weather bureau site.”

In times of emergency, it’s recommended battery-powered radios are part of home emergency kits, with power outages, poor internet and phone coverage meaning many regional areas’ only source of information is the radio. [Continue reading…]

Funklust is back on air with a boost (Red Tech)

ERLANGEN, Germany — Funklust, a German Digital Radio Mondiale shortwave station that began broadcasting in 2003, has returned to the air after undergoing extensive improvements.

Funklust is the student radio station of Friedrich-Alexander-Universität Erlangen-Nürnberg in Germany. The station is a partnership between the university and the nearby Fraunhofer Institute for Integrated Circuits.

Friedrich-Alexander-Universität describes itself as “one of the largest research universities in Germany,” while Fraunhofer bills itself as “Europe’s largest application-oriented research organization.”

A joint effort

The students produce the program content and schedule. Fraunhofer handles the technical side of Funklust. Programming is mostly non-stop music, but it does carry a few external programs, such as Radio Goethe. The station was originally on the air as BiteXpress in 2003 and switched to Funklust several years later.

Fraunhofer recently updated the station’s equipment, and Funklust returned to shortwave in October 2021 after going off air in 2018.

The original transmitter was a 1,000 watt Telefunken S2525 DRM-capable transmitter. Fraunhofer replaced it with a new RFmondial 250 watt transmitter, which feeds the signal into a vertical lambda/four-monopole antenna mounted on a concrete mast at a height of 58 meters (just over 190 ft.)

A shortwave broadcast station typically broadcasts an analog signal using amplitude modulation. A single transmitter would only carry a single audio service, nothing more. By contrast, a DRM transmitter offers additional signal options, including the carrying of transmission information and other data. [Continue reading…]

Public Media and Direct Democracy (Public Media Alliance)

By Gilles Marchand, Director General of SRG SSR

“The fate of democracies will depend on their ability to produce and disseminate quality information.”

This article was originally published in Le Monde on 15 April 2022.

The debate surrounding funding for public service broadcasting is wide open and has, in particular, been covered by this newspaper. The French Presidential election campaigns have provided various different proposals, ranging from replacing the licence fee with an allocated budget to privatising the entire sector.

Clearly, this is a sensitive issue. It concerns a fragile ecosystem that has been disrupted by international pressure from streaming platforms and turned upside down by social media. It also fascinates politicians who enjoy the rush of being regulators, clients and media consumers all at the same time. Switzerland, with its direct democracy model, is an interesting testing ground as the citizens of this small multilingual and multicultural federal state get to decide regularly on the fate of the country’s public service with a vote.

Switzerland: a testing ground

As such, SRG SSR (Swiss Broadcasting Corporation) is the only public service provider in Europe to have come face to face with universal suffrage. In 2018, a referendum on abolishing all forms of public funding for it sparked fierce, unprecedented debate surrounding SRG SSR’s radio, TV and online programmes. The European broadcasting industry watched on in amazement as the battle lines were drawn between those for and against the existence of public service media. In the end, following a lot of intense campaigning, there was a convincing outcome at the polls as over 70% came out in favour of this public service and a licence fee which at the time amounted to around 360 euros a year per household! [Continue reading…]


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