Tag Archives: WWII Radio

German radio museum sheds light on the WWII era Zeesen transmitting station

Many thanks to SWLing Post contributor, Jonathan Marks, who shares the following article and notes in response to our previous post regarding WWII German broadcasts into Australia. Jonathan writes:

[F]ound the attached on a German radio history site. Zeesen was well heard around the world, especially once the power was boosted to 50kW. Bearing in mind the broadcast bands were much quieter, I would expect signals to be heard in Australia/NZ.

The following article is a machine translation into English. Click here to read the full, original piece at Radio-Museum.de.


Shortwave transmitter Zeesen

Zeesen was an independent municipality until 2003, today it is a district of Königs Wusterhausen. In 1927, the German “shortwave transmitter”, the “Weltrundfunksender Zeesen”, was inaugurated in Zeesen. It was in operation until 1945. Then the facilities were dismantled by the Russians and the broadcasting houses were blown up.

Source: FunkAmateur 4/94; pp. 268-270)

From the history of German shortwave broadcasting: The “World Radio Station” Zeesen

GERHARD DAMM – DL1RWD

From 1929 to 1945, one of the most powerful shortwave radio stations of the time worked in Zeesen, on the southeastern outskirts of Berlin. Our article informs you about the prehistory, technical equipment and development of this “wide-range radio station” as well as about its political significance.

The official opening of the shortwave broadcasting service in Germany in 1929 was preceded by numerous activities to explore the usefulness of shortwaves for international operations.
This exploration also included the work of individual internationally renowned scientists, but also that of radio amateurs, primarily from the USA. The industry, including national postal administrations, including the German one, only showed interest in the use of shortwaves after their usefulness began to emerge as a result of the above-00 investigations. Until then, frequencies in the long and medium wave range were used. Fortunately for the radio amateurs, who had been granted the “useless” short waves. Who knows whether there would otherwise be shortwave amateur radio today and thus worldwide radio traffic.

Marconi conducted his first experiments with directional shortwaves in 1916, followed by Franklin in England, who experimented with shortwave voice transmissions in 1919. On the part of the radio amateurs, it was the Americans whose broadcasts were first received in Europe on 8 December 1921. Leon Deloy, a French radio amateur, bridged the Atlantic from Europe to the USA in 1923. And this without a “radio weather forecast”.

And as is so often the case in the history of technical inventions and developments, chance helped those involved to get started. On the occasion of the opening of a commercial radio station in Argentina, the reception of the German long-wave transmitter in Nauen failed due to strong atmospheric interference. A Telefunken engineer involved referred to the fact of the success of American radio amateurs in the use of shortwave. It may sound strange, but these events prompted telefunken to develop a shortwave transmitter and put it into operation in Nauen. With 800 W RF power, telegraphy connections with South America ran from July 1924.
These and other successes prompted the then Deutsche Reichspost. to deal with targeted experiments on the application of shortwaves to the broadcasting service. You have to know about that. that other European countries. e.B. in Englandthe BBC, in the mid-20s had begun with the trial broadcasting of radio programs in the shortwave range. Shortwave broadcasting therefore became not only a technical but also a national prestige issue.

From the location Königs Wusterhausen, which was previously used for radio broadcasts – the official opening of the German radio took place on 15 October 1923, the Deutschlandsender began its operation on 11 August 1925 on from 1 September 1926 radio broadcasts on shortwave.

The transmitter, built by Telefunken. radiated its power of 250 W via a simple oblique wire antenna. which was integrated into the existing antenna support masts.
Originally planned. on the then already existing central tower (popularly: the thickness) additionally put on a vertical spotlight. However, this ultimately failed due to political conditions. In the wake of the First World War, Germany was prohibited, among other things, from erecting buildings that would have exceeded the height of the Eiffel Tower. And this would have been the case in Königs Wusterhausen.

Partial view of the first KW antenna star with 70 m towers.On the far left, the 70 m wooden tower with the KW omnidirectional radiator, in the middle a 210 m mast for LW (1934)

The radio transmitter in Königs Wusterhausen was no longer expandable at that time, already the Deutschlandsender 11 (LW) had gone into operation in 1927 on the site of the aviation company SchütteLanz (airship construction and airfield) in Zeesen acquired by the Reichspost. In 1928, for example, the Reichspost commissioned the construction of a high-power shortwave transmitter on this airfield in Zeesen. The contract was awarded to Telefunken.

Telefunken built the first KW transmitter in House 4 (Houses 1 to 3 were located in Königs Wusterhausen) at the location of Deutschlandsenders 11. The power of this KW transmitter was quite respectable for those times, it was 5 kW, later 8 kW. The transmitter was built in seven stages and consisted of the crystal oscillator, followed by amplifier and multiplier stages. The power amplifier contained an RS 225 in the 5 kW version and two RS 225 in the 8 kW version, which were operated with an anode voltage of 10 kV. The modulation took place in the driver stage. The antenna part was designed for the frequency range from 3 to 20 MHz and was used to adapt the modest, 75 m long single-wire vertical antenna, which led to one of the two 210 m masts for the Deutschlandsender.

Ten machine sets (plus ten as a reserve) were required for the entire power supply of the KW transmitter. These consisted of high-voltage converters and DC generators. e.B. for heating. The end tubes were pressure-cooled with rainwater. After the official commissioning, the transmitter initially operated on two frequencies: 6.02 and 9.56 MHz. Higher frequencies were not released for broadcasting until 1932.

The wide range of the station at that time, which was in no way inferior to the stations Eindhoven (Netherlands) and Schenectady (USA), led to the naming “World Broadcasting Station” or World Broadcasting “Short Wave Transmitter” at the opening on August 26, 1929. In 1930, the antenna system underwent significant improvements. The construction of a 70 m high wooden tower(!) complemented the vertical wire spotlight. Quadruple dipoles in four directions were placed around the tower. This dipole combination achieved a favourable vertical opening angle and an elevation angle of 10′. The antenna gain is said to have been 9 dB.

The first directional antenna, commissioned for North America in January 1932, achieved a horizontal bundling of 30′. The performance gain was just under 17 dB! It consisted of a group of 24 dipoles plus reflectors. By 1934, ten such directional antennas had been attached to eleven steel lattice towers, each with a height of 70. They supplied the areas of North, Central and South America, East Asia and Africa in the frequency range from 6 to 17 MHz.

A second quartz-controlled transmitter with 5 kW was added in 1932. It was designed in eight stages, used two RS 255 tubes and was modulated like transmitter 1 with direct current.

While the stations had previously broadcast state programs of other stations, from 1933 a separate programming was carried out by the then Reichsrundfunkgesellschaft. It was specially intended for listeners abroad and was fully dedicated to the socio-political situation in Germany.

What a miracle that this also led to the further equipment of the transmitter in Zeesen. In 1935, another KW transmitter of the type “Nauen” (50 kW) with a telephony power of 12 kW began its operation. This transmitter worked in the power amplifier with two RS 257 switched in push-pull, a further development of the previously used RS 225.

As a special feature, it had a double equipment with oscillating circuits (variometers), which had to be retuned during frequency changes. Pre-tuning significantly reduced the frequency changeover period.

The switching between day and night frequencies as well as other frequency changes suitable for the most favorable propagation were already carried out on the basis of forecasts of the Reichspostzentralamt.

The broadcasting station in Zeesen experienced a special technical upswing in preparation for the 1936 Olympic Games in Berlin. In addition to the existing transmitter house 4, houses 5 and 6 were built. Among other things, they consisted of a 500 m 2 transmitter hall, which could accommodate four transmitters with 40 kW of power, which Telefunken and Lorenz built. These bore the well-known name “OlympiaSender”. A combination of parallel and push-pull switching of four RS 257 transmitter tubes made the high transmission power possible, which was later increased to 50 kW. In addition, anode BModulation was applied. The transmitters were built in seven stages and allowed quartz and VFO operation.

Olympiasender” (50kW) in Zeesen (1935/36)

In addition to the expansion of the number of transmitters, an expansion of the antenna systems was necessary. A further 13 steel lattice towers were added, which, in contrast to the existing eleven 70 m towers, had a height of 100 in. This made it possible to achieve an even stronger vertical bundling by eightfold dipole stocking.

During the first years of the war, rhombus antennas were already being built in Zeesen, which had already been tried and tested in other radio services. Compared to the frequency-dependent dipoles, these are characterized by a relatively large frequency bandwidth and good radiation bundling.

In addition, the construction with wooden poles is possible because of the low installation height, which is probably also a question of materials in times of war. The construction also did not require the technical and material effort as with the already operated 70 and 100 in high steel lattice towers.

In 1939, the realization of a technical development in antenna construction, which was certainly spectacular for the time, was added. On one of the 70 m towers of antenna star 1, an extendable vertical radiator with self-tuning was installed, which enabled radiation over a wide frequency range (5 to 30 MHz) by changing its length. This antenna was called “Pope’s Finger” in insider circles, as such a construction had previously been erected at Vatican Radio.

In its last stage of expansion, the “World Broadcasting Transmitter Zeesen” consisted of the following systems: nine 50 kW shortwave transmitters, a 12 kW shortwave transmitter, a LW Transmitter with two 210 m masts, 24 dipole walls at eleven 70 m and thirteen 100 m towers, the vertical spotlight “Papstfinger”, the 70 m wooden tower with omnidirectional radiator and four rhombus antennas. Three transmitter houses, a diesel house and a network substation completed the technical equipment on this former airfield.

On April 26, 1945, the “Weltrundfunksender Zeesen” ceased its broadcasts. The operator removed important individual parts on command. The plants remained undamaged in order to be able to put them back into operation in the event of a “reconquest”, which, as is well known, did not come of anything. The Soviet troops dismantled the transmitters and antenna systems in the summer of 1945 and blew up the buildings.

After the founding of the GDR, a military KW broadcasting station began operation on part of the former broadcasting site, the part of the former location of sender house 4 for the long-wave Germany transmitter and the first KW antenna star, which is currently also being dismantled. The rest of the site was and is used economically.

In addition to this purely technical consideration of the world radio station of the Zeesen, by the way, a short political consideration should not be missing. While the shortwave broadcasting service and the establishment of the transmitter in Zeesen (there were also KWS broadcasting centers in Elmshorn near Hamburg, Ismaning near Munich and Oebisfelde west of Berlin) were first a technical and national prestige question – as I said, other countries within and outside Europe had already begun with the introduction of shortwave broadcasting for foreign broadcasts – it became more and more a worldwide propaganda instrument with the seizure of power by the National Socialists in 1933. Especially during the Second World War, this importance grew. All the belligerent states had recognized the role of foreign broadcasting. The international etheric war arose.

Before the Second World War, the main task was to bind Germans to their homeland abroad? thus the “German shortwave transmitter” developed into the so-called ranged gun in the ether”. One spoke of the “wave artillery of radio and its transmitter batteries”. The “Deutsche Kurzwellensender/ Weltrundfunksender Zeesen since 1936 world top performance in technical terms, was ideally suited for this political task. Some insiders I know even spoke of the “V 3″.
Reactions abroad ranged widely. They were enough, for example.B from Germans abroad: _’Do you know how a German feels. when in the evening greetings from home. from our dear fatherland, flooding through a German house in the African bush…” or: During the day we are in Brazil. but when the call sign of the German shortwave transmitter sounds, then we feel like in our heirnat” or: .. Through these broadcasts I have gained an indestructible faith in the new Germany and its leader … – up to: “This shortwave system represents the greatest potential propaganda weapon. that the world has ever seen…”

Despite all the jubilation for technical progress, it is important to consider. how it can be abused. In the case of the former “dreamy fishing village of Zeesen” south of Berlin in connection with Schütte-Lanz and airship and aircraft construction in the First World War, followed by the “world radio transmitter Zeesen- as a ranged gun” in the Second World War

Literature
(1) Archive of the author (information provided by former employees)(2) 50 Jahre Kurzwellen-Rundfunk, Sonderdruck 1979 [3] Wortschlacht im Äther, Morgen die ganze Welt, Deutsche Welle

Click here to read this and more articles on Radio-Museum.de.

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The Sullivans: Could WWII German broadcasts be easily received in Australia?

Many thanks to SWLing Post contributor, Ray Robinson, who writes:

Hi, Thomas. I have recently been re-watching the Australian soap serial ‘The Sullivans’, which ran on Channel 9 from 1976-1983. I used to watch it on ITV in England, and also for awhile on the Tempo cable & satellite channel here in the States in the late 80’s. It is set in Melbourne during the second World War and after, and begins in September 1939. In the episodes covering the early part of 1940, much is made of one of the character’s abilities to listen to Nazi German broadcasts via shortwave, in both English and German (and they play clips of actual audio in the episodes). My question is, how realistic is this?

Were German broadcasts at that time able to be heard with good quality in Australia? Does anyone have a transmission schedule from that era? I know that German broadcasts were well heard throughout Europe and in North America, but I don’t have any details of broadcasts targeting Australia. Might they have been relayed via some Axis transmitter in the Far East? If any of your SWLing Post readers can shed any light on this, I’d be very grateful. Thank you.

Ray Robinson

Great question, Ray. This is certainly an inquiry for radio enthusiasts and WWII buffs in Australia and New Zealand. I’m sure there are accounts out there that could verify how easily and frequently Axis broadcasts could be heard in Australia and NZ. My guess would be that propaganda would have certainly targeted Australia and New Zealand during WWII.

Please comment if you can provide some insight and/or evidence for Ray!

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Radio Waves: CC Solar Review, National Amateur Radio Operators Day Proposed, Converting Vintage into WiFi, Bletchley Park Remembers WWII Op, and Turkey Celebrates 94 Years of Radio

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 Paul, Richard Langley, Troy Riedel, and the Southgate ARC for the following tips:


New Solar Radio Is an Emergency Kit too (Radio World)

Solar-powered portable radios that put audio quality second are nothing new. But a solar-powered portable radio that sounds as good as a non-solar high-fidelity radio: This is worth talking about.

The new CCRadio Solar from C.Crane fits this double-barreled description. With its generous top-mounted solar panel (3.75 by 1.5 inches) plus back-mounted generator crank for recharging its Lithium-Ion battery pack, this is a radio for blackouts and other emergency situations.

After an initial conditioning charge-up of the Lithium-Ion battery from a 5V DC adaptor, just leave it in a sunny window, and the radio is always ready to go.

In non-emergency situations, the CCRadio Solar can be powered with three AA batteries or a 5V DC charger plugged into its micro-USB port.[]

(Also, click here to read our review of the pre-production CC Solar.)

Congress Seeks to Designate National Amateur Radio Operators Day (In Compliance)

The U.S. Congress is reportedly taking steps to officially recognize the important contributions made by amateur radio operators.

According to an article on the website of the ARRL, Congresswoman Debbie Lesko (AZ) has introduced a bipartisan resolution to designate April 18, 2022 as National Amateur Radio Operators Day. April 18th is the anniversary of the founding of the International Amateur Radio Union (IARU) which was established in 1925.[]

An Inside Job (IEEE Spectrum)

YOUR GRANDPARENTS’ ancient transistor radio might still turn on and tune in to stations broadcasting conventional AM or FM signals. But in this Internet age, a blizzard of content is available from sources accessible only via the Web. What’s more, instead of speakers that flood a room with sound, we’ve grown accustomed to personal listening using earbuds and headphones. Now engineers like Guillaume Alday, founder of Les Doyens in Bordeaux, France, have come to the radio’s rescue. Alday keeps old-school radios from slipping into obsolescence by retrofitting their innards with components that transform them into Wi-Fi- and Bluetooth- enabled devices.[…]

Bletchley Park: WW2 secret agent’s messages remembered (Southgate ARC)

The BBC reports the first message sent back to Britain by a ‘trailblazing’ special agent in World War Two has been commemorated, 80 years on, by radio amateurs using GB1SOE

Georges Begue, of the Special Operations Executive, was parachuted into occupied France in 1941 to set up wireless communications with the UK.

Amateur radio enthusiasts have marked his achievement by sending and receiving messages at Bletchley Park.

On Thursday and Friday May 6-7, Milton Keynes Amateur Radio Society is using replica equipment to transmit Morse code messages from the National Museum of Computing at Bletchley to fellow radio enthusiasts in central France, stationed less than a mile from where Begue landed.

Read the full BBC story at
https://www.bbc.co.uk/news/uk-england-beds-bucks-herts-57008943

Milton Keynes Amateur Radio Society GB1SOE
https://www.mkars.org.uk/index.php/2021/05/06/mkars-members-run-gb1soe-6th-and-7th-may-on-7-035mhz/

The National Museum of Computing at Bletchley Park
https://www.tnmoc.org/events/https/wwweventbritecouk/e/152664127515

Turkey marks 94th anniversary of its first radio broadcasting (Hurriyet Daily News)

Turkey celebrated Radio Day on the 94th anniversary of the start of radio broadcasting in the country.

“Radio broadcasting in Turkey started 94 years ago today with the first announcement,” Turkey’s Presidential Communication Director Fahrettin Altun wrote on Twitter.

“Our radios, which have been working devotedly to bring our beloved nation together with the truth for years, have become one of the most important parts of our lives,” he added.

Altun also congratulated all radio workers on Radio Day too.

Türkiye Radyolar? (Radios of Turkey) has started first radio test broadcasts in 1926, with a studio built in Istanbul. The first radio broadcast in the country, however, began on May 6, 1927.[]


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Radio Waves: DIY Internet Radio With Real Buttons, Armed Forces Day Cross-Band Test, Tokyo Rose, Shortwave Collective, and RAC Portable Operations Challenge

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 Paul, Dennis Dura, and David Goren for the following tips:


Internet radio with real buttons using Stream Deck (Bjørn Erling Fløtten)

How I used a Stream Deck Mini from Elgato in order to give my mother-in-law a super easy Internet radio experience.

By Bjørn Erling Fløtten, Trondheim, Norway. April 2021.

See also comments on Hacker News

Background

My mother-in-law is from Poland. When she stays in Norway in order to help us with babysitting she misses Polish radio. In principle this is easily accessible through the Internet now from all kind of devices.

BUT, my mother-in-law is not PC-literate, nor does she use a so called ‘smart’-phone. With my long experience in teaching people far younger than her simple mouse and keyboard techniques, I knew that operating Windows and finding Internet radio stations on her own would just be too cumbersome. I therefore had to create a super simple setup for her, and my hacker mind started to think.

(I did of course consider special purpose Internet radios. They should in theory be quite simple to operate, but they all have som kind of quirks that I did not like. And besides, constructing something of your own is of course always more satisfying.)

I want Real Buttons!

What I really wanted was big buttons with tactile feedback. I had earlier experienced with some Behringer products (sound mixing board) in order to demonstrate mathematical functions. The idea then was to use turning knobs and sliders in order to see how changing parameters changed the outcome of the function, especially graphs in 2D and 3D.

I thought this would be useful also for an Internet radio, but then I remembered having read about the Optimus Maximus keyboard (keyboard with programmable led icons on each key), and I thought such a product would be even better. This search led to Elgato and their Stream Deck Mini. This has 6 buttons, just enough for a radio. I might have preferred the bigger version with 15 buttons but their products are ridiculously expensive, so I had to be content with just 6 buttons.

In addition to the Stream Deck Mini my son donated his old school laptop with Windows 10 installed. It was a cheap ThinkPad L-series which, although 3 years old and somewhat battered from daily use to and from school, was quite capable of streaming some audio from the Internet. My son created a guest account in Windows 10 with auto login. He set ‘Fn lock’ as default, meaning that keys F1, F2 and F3 was volume off, down, up without having to press Fn. We also found a pair of speakers lying around in the house.

No programming necessary *

(* But understanding of HTML, URLs and Windows command line arguments is a requisite.)

Initially I thought I would make a Windows application for controlling which radio streams to play. But it turned out that Elgato’s accompanying software was quite capable by itself.

I assigned five of the six available buttons to launch the standard web browser (Google Chrome in this case) with a corresponding streaming URL (radio channel).

Continue reading the full article by clicking here.

Annual Armed Forces Day Cross-Band Test set for May 7 – 8 (Southgate ARC)

The US Department of Defense will host this year’s Armed Forces Day (AFD) Cross-Band Test, Friday and Saturday, May 7 – 8, in recognition of Armed Forces Day on May 15. The event is open to all radio amateurs.

For more than 50 years, military and amateur stations have taken part in this exercise, designed to include amateur radio and government radio operators alike.

The AFD Cross-Band Test is a unique opportunity to test two-way communications between military and amateur radio stations, as authorized under FCC Part 97 rules. These tests provide opportunities and challenges for radio operators to demonstrate individual technical skills in a tightly controlled exercise in which military stations will transmit on selected military frequencies and will announce the specific amateur radio frequencies being monitored.

The schedule of military/government stations taking part in the Armed Forces Day Cross-Band Test and information on the AFD message is available on the MARS website.

Complete the request form to obtain a QSL card. ARRL

“Tokyo Rose” – WW2 Traitor or Victim? (YouTube)

Shortwave Collective – FENCETENNA (YouTube)

RAC Canadian Portable Operations Challenge Award (Southgate ARC)

The RAC Challenge Award: An Overview
Radio Amateurs of Canada is pleased to present a new Canadian Portable Operations Challenge Award for RAC members.

The objective of the new “RAC Challenge Award” is to recognize and encourage portable operations by RAC members from locations throughout Canada.

The new program will begin on Canada Day, July 1, 2021 and we hope it will become an annual event for RAC members.

Note: the following information is tentative as the new Awards program is still being organized so please stay tuned to this webpage for future updates.

Portable Operations
Portable operations are those in which Amateurs take their equipment, antennas and power supply to a location away from their home station to operate. This includes mobile stations, backpackers, DXpeditions and participation in events such as those described below:

Parks On The Air (POTA), a worldwide program of park activations – https://parksontheair.com/
Quebec Parks On The Air (QcPOTA) April 1 to December 31
Field Day: June 26-27
There are several other programs that celebrate portable operations including Summits on the Air (SOTA), Islands on the Air (IOTA) and the International Lighthouses and Lightships Weekend.

Features of the “RAC Challenge”
The new “RAC Challenge” will recognize all portable operations in which RAC members participate and will have similar features as a contest. Amateur Radio contests in VHF, UHF and the Microwave bands all have categories for “Rovers” – who move from grid square to grid square and “Backpackers” – who seek out hilltops from which to operate with highly portable equipment and antennas.

For many satellite operators, making contact with as many grid squares as possible is a mark of success. Some of those operators go on satellite DXpeditions to activate rare grids or operate from the intersections of grids to offer multiple grids with a single contact. In addition to being fun, these activities provide an opportunity for Amateurs to experience what is required to set up and operate under challenging conditions – valuable experience for emergency preparedness.

For more on the RAC Challenge Award, please see:

RAC Canadian Portable Operations Challenge Award


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Please consider supporting us via Patreon or our Coffee Fund!

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Radio Waves: Crossband Test Postponed, VI3RA Event Videos, WWII Radio, and Look Inside a Panasonic RF-4900

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 Harald Kuhl, Michael Bird, and Carel Kuijer for the following tips:


Annual Armed Forces Day Crossband Test Postponed (ARRL News)

Due to the ongoing COVID-19 response and mitigation actions, the 2020 Armed Forces Day (AFD) Crossband Test scheduled for Saturday, May 9, has been postponed. Because it’s uncertain just when stay-at-home orders will be lifted across the US, AFD planners chose to postpone this year’s event, because the government stations that typically support this event may not be available. Armed Forces Day Crossband Test planners are considering scheduling a November event in honor of Veteran’s Day, depending on COVID-19 mitigation actions. During the AFD Crossband Test, military stations in various locations transmit on selected military frequencies and announce the specific ham frequencies they are monitoring to work radio amateurs. — Thanks to US Army MARS Program Chief Paul English, WD8DBY

Radio Australia Event – Antenna Overview (Mount Evelyn DX Report)

Thanks to Lee VK3GK for this short video of the antennas used for the recent Radio Australia event using the call sign VI3RA. Take what will possibly be a final look at the feeders, switching boxes and antennas before they are pulled down and junked!

Also here is the final transmission of the event weekend with, of course, the famous Radio Australia music box interval signal.

Click here to view both videos at the Mt Evelyn DX Report.

World War II and Radio (All Things Radio)

I have added an article I wrote some years back on the code breaking efforts of the Allies during WWII. While certainly not exhaustive, I found many of the connections between countries and equipment rather fascinating, and new things continue to pop up regarding Bletchley Park’s role in training officers and decoding texts. While most famously known for breaking the Enigma code, also significant was the breaking of the Lorenz Cipher.

Click Here to download the article in PDF format.

73, Robert K4PKM

Look Inside This Radio Receiver! The Collectible Panasonic RF 4900 (Mr. Carlson’s Lab – YouTube)

Let’s look inside this Panasonic RF-4900 radio receiver, and see what we have to restore.


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The Birth of Radar Memorial

Photo by Amanda Slater

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

Interesting article on the new monument to radar between Daventry and Towcester in Northamptonshire, UK.

https://www.atlasobscura.com/places/birth-of-radar-memorial

Legend has it that this was conducted around 25-28 MHz, which was the very top end of higher power RF at the time.

The location sits closer to Towcester, although the event is always quoted as having taken place at Daventry (the source, not the receiver).

It’s fascinating that Plessey Research Caswell was set up almost immediately, not very far away and was heavily involved in radar and other solid-state research through to the 1990s.

[Disclosure: the author (Paul) worked at Plessey Caswell and was Two Terminal device Manager at Plessey Microwave, Towcester in the 1980s]

Many thanks, Paul, for sharing this fascinating bit of history.

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The WWII “Mosquito Network”

Many thanks to SWLing Post contributor, Marty, who shares this article by Mark Durenberger in Radio World:

Inside the U.S. effort in a battle of the airwaves during the Pacific campaign of World War II

We can’t fully appreciate the importance of news from home to those who served in World War II. In the Pacific campaigns, G.I.s, sailors and Marines fought bloody island-hopping battles; as each island was cleared, garrison troops and hospitals moved in and carried on their own war against mosquitoes, isolation and boredom. The island fighters were fortunate if dated mail caught up with them before they moved on to the next target. Timely personal-level communications were pretty much absent.

Radio programming from America was available but only on shortwave. And shortwave radios were not generally available. The fortunate few had been issued “Buddy Kits” that included a radio, a small PA system and a record player for discs sent by mail. But for most there was no way to receive short-lived information such as news and sports. They were left with enemy radio propaganda such as Japan’s “Orphan Ann/Annie” (aka one of several Tokyo Roses) and the “Zero Hour” program.

No wonder that the idea of having a local island radio station doing “live from home” was so fiercely supported. Enlightened commanders saw the idea as a terrific morale-builder. The only problem was how to pull it off.

A solution, not uniquely, came from within the ranks. It started with the work of some bored but talented soldiers in the Panama Canal Zone who in 1940 built a couple of 50 W transmitters and put them on the air without authorization, labeling them “PCAN” and “PCAC.”[…]

Click here to continue reading the full article at Radio World.

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