Tag Archives: Czech Radio

Radio Waves: Broadcast v Ham Radio, Marjorie Stetson’s Secret Wartime Work, Czech Republic MW Switch-Off, and PV RFI

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!

Alike, but Not Alike: Broadcast vs. Ham Radio (Radio World)

Experience in amateur radio can be a boon to the radio engineer

Starting in the 1920s and through the ’60s, almost every broadcast engineer was a licensed amateur radio operator. That has changed a bit, but the importance of being a ham has not.

Both environments involve getting an RF signal from Point A to Point B. But it is interesting to note that radio broadcast and amateur radio are similar and yet so different.

For those who don’t know much about ham radio, I’ll tell you that communicating locally or internationally, via licensed amateur radio, can be a fascinating and challenging hobby. There are about 700,000 hams in the U.S. and an equal number worldwide.

Physics

Broadcast and amateur radio operate under the same laws of science. Transmitters, transmission lines, antennas and receivers make up an RF path to convey a message.

Broadcast engineers know that signal propagation on AM and FM bands is dramatically different. It is because our FM band is roughly 100 times the frequency and 1/100th the RF wavelength of that on the AM band. Engineers also know that 950 MHz STL signals are line-of-sight and roughly a 10-times jump in frequency from FM broadcast frequencies. Each band has its own challenges in getting a useable signal through. [Continue reading…]

A Canadian opens up about her secret wartime work — eavesdropping on Japan (CBC)

Retired sergeant remembers what it was like on the ‘front line of the radio war’

At age 97, Marjorie Stetson has never told anyone her secret code number — until now.

That’s the identity code — 225 — that she typed on every page of her highly classified work for the Canadian Armed Forces during the Second World War.

The retired sergeant’s wartime work was so covert, she said, she had to sign 15 separate copies of Canada’s Official Secrets Act.

“Nobody knew where I worked,” Stetson told CBC News from her home in Massachusetts ahead of Remembrance Day. “Nobody knew what we did. Even my parents never knew what I did in the service.”

Her husband, an American sailor she met at a celebration marking the end of the war, passed away a decade ago. She never told him what she really did during the war.

Today, Stetson herself is only now learning about the true scope of her role and the significance of all those sheets of white paper she filled with encrypted messages from Japan. [Continue reading…]

Czech Republic: MW Switch-Off by 2021 (Radio Reporter)

Czech public radio ‘?eský Rozhlas‘ is stepping up its information campaign for listeners receiving mediumwave programmes, ahead of the planned switch-off of transmitters by the end of 2021. Since 1 November, more announcements have been broadcast to warn users and a call centre has been set up to explain the possible listening alternatives (from FM to DAB). In the run-up to Christmas, public radio will launch an intensive advertising campaign in the print media and online magazines on 22 November to promote the purchase of digital DAB receivers to replace analogue radio. [Continue reading…]

The impact of photovoltaics (Southgate ARC)

Seamus Ei8EP reports on the IARU Region 1 website that the 358 page Final Report on the Study on the evaluation of the Electromagnetic Compatibility Directive has now been published.

It is publicly available, free of charge, from the Publications Office of the European Union. The Political Relations Committee of the IARU Region 1 responded recently to a European Commission Roadmap on the environmental impact of photovoltaics.

The radio spectrum is an important finite natural resource which must be protected. While PV technology of itself is to be welcomed, the IARU submission pointed out the inherent problems of non-compliant installations, particularly the installation or retro-fitting of optimisers which can produce significant spectrum pollution for very limited efficiency increase.

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Radio Waves: A “Calm” Solar Cycle 25, WWJ History, Czech Radio’s Digital-Only Future, and UK Ham Radio Exam Stats

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Radio Waves: Stories Making Waves in the World of Radio

Many thanks to SWLing Post contributors Ron, Mike, and the Southgate ARC for the following tips:

As Disasters Roil Earth, A New Sun Cycle Promises Calmer Weather — In Space (NPR)

Giant flares and eruptions from the sun can cause space weather, and stormy space weather can interfere with everything from satellites to the electrical grid to airplane communications. Now, though, there’s good news for people who monitor the phenomenon — the sun has passed from one of its 11-year activity cycles into another, and scientists predict that the new cycle should be just about as calm as the last.

That doesn’t mean, however, zero risk of extreme weather events. Even during the last, relatively weak solar cycle, drama on the sun triggered occasional weirdness on Earth like radio blackouts, disruptions in air traffic control, power outages — and even beautiful aurorae seen as far south as Alabama.

Over each solar cycle, the roiling sun moves from a relatively quiet period through a much more active one. Researchers monitor all this activity by keeping an eye on the number of sunspots, temporary dark patches on the sun’s surface. These spots are associated with solar activity like giant explosions that send light, energy, and solar material into space.

Counting of sunspots goes back centuries, and the list of numbered solar cycles tracked by scientists starts with one that began in 1755 and ended in 1766. On average, cycles last about 11 years.

Based on recent sunspot data, researchers can now say that so-called “Solar Cycle 24” came to an end in December of 2019. Solar Cycle 25 has officially begun, with the number of sun spots slowly but steadily increasing.[…]

WWJ in Detroit: A 2020 Centennial Station (Radio World)

Iconic AM station just celebrated the 100th anniversary of its first broadcast

It was shortly after World War I that Clarence Thompson, a partner of Lee de Forest, formed a new company Radio News & Music Inc. in New York. His goal was to encourage newspapers to broadcast their news reports by wireless, using de Forest transmitters.

The franchise offer — available to only one newspaper in each city — offered the rental of a de Forest 50-watt transmitter and accessories for $750. Just one newspaper signed up for the deal; it was the Detroit News, led by publisher William E. Scripps.

He had been interested in wireless since investing in Detroit experimenter Thomas E. Clark’s wireless company in 1904. Scripp’s son, William J. “Little Bill,” was an active ham radio operator, operating a station in the Scripps home.

People Might Laugh

Scripp proposed accepting the Radio News & Music offer and building a Detroit News radio station in 1919, but he met resistance from his board of directors. It was not until March of 1920 that he was given the go-ahead to sign a contract.

The de Forest transmitter was shipped to Detroit on May 28, 1920, but was lost in transit; a second transmitter was constructed and sent on July 15. This delayed the installation of the station until August.[…]

Czech Radio has expanded DAB + coverage to 95 percent of the population and announced the switch-off of medium waves (Digitalni Radio)

NOTE: This is a machine translation of the original post in Czech.

Czech Radio has entered another, important phase of radio digitization. To date, the ?Ro DAB + multiplex signal has reached 95% population coverage. Ten new transmitters were launched in Bohemia and Moravia. You can find a detailed description of them below.

DAB + technology is becoming a common distribution channel for Czech Radio, which will be placed on the same level as analogue FM / FM broadcasting. All marketing activities will already include the “DAB + More Radio” logo. ?eské Radiokomunikace is planning to start certification of receivers next year in order to protect customers and facilitate orientation in the range for them and retailers.

According to the CEO of Czech Radio, René Zavoral, the public service media is proceeding in accordance with a long-term strategic plan. The head of communication and press spokesman Ji?í Hošna describes the step as a turning point that can affect the direction of the entire radio market.[…]

UK amateur radio exam report released (Southgate ARC)

The RSGB Examinations Standards Committee (ESC) report covering 2019 is now available for anyone to download

The report contains statistics for the both the RSGB amateur radio exams and the Air Cadets Organisation (ACO) exam which Ofcom considers to be equivalent to the RSGB Foundation.

Ofcom has been concerned about the participation of women in amateur radio and STEM disciplines. They requested the ESC to publish figures for the number of women taking the exams. Unfortunately the results are disappointing with only 9.9% of all exams being taken by women.

Download the ESC report from
https://rsgb.org/main/blog/examination-standards-committee-reports/2020/09/18/examinations-standards-committee-report-2020-for-activities-during-2019/

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Hear My Voice: Radio’s role in Hitler’s annexation of the Sudetenland

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In January, when I first heard about David Vaughan’s book Hear My Voice, I knew then and there I would have to read it. So I picked up a copy on Amazon with the intention of doing so…well, soon.

However, I’ve got quite a number of books in my to-be-read stack at the moment, so Hear My Voice lay in wait on my bookshelf until this past Sunday, when I decided to read the first chapter––just to get a taste of it.

Although I had a very busy day in store––working on a home renovation and making several trips into town––nevertheless I struggled to pull it from the stack, and having rapidly consumed the first chapters, had a hard time putting the book down. By the day’s end, I found I had read the entire book.

While those who know me know I’m a bit of a WWII history buff, I only knew that Hitler’s seizure of the Czech Sudetenland was but a hint of what was to come. The history I’d read previously had provided a bit of insight into this crucial lead-up to the war, but not as Vaughan’s book does: in what feels like a first hand account, through the eyes of an interpreter and broadcaster. I was hooked.

Hear My Voice clearly indicates how transformative the medium of radio was in this era, and how deliberate and insidious Nazi propaganda became in the Sudetenland years before Czechoslovakia ever took notice.

All in all, it’s a great read. I think you’ll find Hear My Voice as intriguing as I did.

You can purchase Hear My Voice via:

Amazon.com $11.99 shipped (affiliate link supports the SWLing Post)
Book Depository $12.16 shipped
Barnes and Noble $11.99

Read our previous post which includes a Radio Prague audio interview with the author.

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David Vaughan on Czech radio and the role of propaganda leading up to WWII

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Czechoslovak Radio in the mid-1930s, photo: Czech Radio

Many thanks to SWLing Post contributor, John Palmer (KC8RZM), who writes:

Was listening to Radio Prague yesterday evening, there was a very interesting item where author, David Vaughan, was interviewed and talked about his most recent book “Hear My Voice” a novel which deals with the lead-up to WWII and in which Czech Radio plays a part:

Click here to view on Amazon (affiliate link).

The play, on which the novel is based, was commissioned by Czech Radio and was awarded the Czech Book readers’ award for 2015. In the interview the importance of this then new technology called radio was discussed and its influence, for good or bad, in the world at large, an interesting parallel to today’s discussion on the role of the internet and social media. From the capsule bio on the book cover his background is in languages and radio (BBC and Czech Radio).

I’m sure his other book, Battle of the Airwaves: Radio and the 1938 Munich Crisis, will be of interest to shortwave listeners:

Click here to view on Amazon (affiliate link).

From the Amazon description:

“1938 was a turning point in the histories of Europe and the media. When Hitler annexed Austria and then turned his attention to Czechoslovakia, radio was at the heart of events. Battle for the Airwaves looks at the Munich crisis as it was played out on the radio stations of Czechoslovakia, Germany, Britain and the United States, and reveals just how central a role radio played in the run-up to the Munich Agreement and beyond. It is a story of propaganda and counter-propaganda, censorship and self-censorship. It is also a story of courage and innovation. Munich was a fateful step in the road to World War Two; it also marked the beginning of the age of the electronic media. Published in English and Czech in a single, illustrated, hardback volume, Battle for the Airwaves is accompanied by a CD recording of key British, Czechoslovak, German and American radio broadcasts from 1938.”

Anyway, just thought the above might be of interest to others at the SWLing Post. I’d like to learn more from him on the role of radio in those early days on the events leading up to WWII. I’m probably going to check out his novel.

Thank you so much for sharing this John! I received an Amazon gift card and have already put Hear My Voice in the cart. I look forward to reading it!

I missed the live broadcast, but did find Pavla Horáková’s interview with David Vaughan on the Czech Radio website. Here’s the introduction and audio:

Earlier this year the Czech Republic marked the 80th anniversary of the Munich Agreement, signed in September 1938 by the leaders of Germany, France, Great Britain, and Italy, resulting in the annexation of the Sudetenland by Nazi Germany. Radio Prague’s David Vaughan recently published a book in the UK titled “Hear My Voice”, most of which is set in Czechoslovakia in the months preceding the Munich agreement. Its narrator is an interpreter for the international press corps in Prague and he watches the events of 1938 unfold in Central Europe as the atmosphere is getting tenser ahead of the outbreak of the Second World War. Pavla Horáková spoke to David Vaughan and their conversation begins with a few paragraphs from the book.