Free online lecture: “Aspidistra and the Broadcast Group of the Diplomatic Wireless Service”

Many thanks to SWLing Post contributor, Kris Partridge, who shares the following information about a free online lecture hosted by the The Institute of Engineering and Technology. This presentation will take place tomorrow (September 8, 2021 staring at 19:00 BST/18:00 UTC). You must register online to attend this lecture.

Here are the details from the IET website:


Aspidistra and the Broadcast Group of the Diplomatic Wireless Service including the wartime transmission of black propaganda.

The History of the Broadcast Group of the Diplomatic Wireless Service. The event starts at 19:00 BST on 8th September 2021

This is the story of Broadcast Group of the Diplomatic Wireless Service (DWS) which had its origins in the Political Warfare Executive (PWE) at the beginning of WW2. In 1972 it was amalgamated into the administrative structure of the Foreign and Commonwealth Office (FCO) and was renamed Communications Engineering Department (CED). The latter had two groups, Broadcast Group which was responsible for transmitters carrying many of the BBC’s World and Vernacular services, and Communications group which provided radio communications to embassies for diplomatic traffic. In 1986 CED’s Broadcast Group was taken over by the BBC.

In this illustrated talk we will learn first about the transmission of black propaganda and associated activities during WWII. Also such activities as trying to interfere with enemy rocket guidance systems. Then about the various Medium-Wave and Short-Wave transmitting stations of Broadcast Group with transmitter stations at Crowborough, Orfordness, Cyprus and the island of Masirah, a part of Oman. Transmitters ranged from 1?kW carrier power to 600 kW. Several of these were designed and manufactured in house. There will be many pictures and descriptions of the equipment and aerials used at these stations. Also covered will be an introduction to the progress of amplitude modulation techniques which enabled transmitters to become more compact.

So, what is Aspidistra? Please register to hear the story of Aspidistra and the Broadcast Group of the DWS with the engineering used to build and operate these stations.

About the Speaker

Roger Castle-Smith FIET

Mr Roger Castle-Smith FIET. Roger first became interested in radio when he joined the signals section of his school’s Combined Cadet force. This led to him gaining an amateur’s radio license at the age of 15, callsign G3IOT. Then on to the Royal Military Academy, Sandhurst, where he started an amateur station for the academy. Graduated into Royal Signals. Achieved a BSc(Eng) degree as an external degree from the University of London whilst at the Royal Military College of Science. Many of his army postings were of a technical nature. On retirement at the age of 37 he was made a MBE. Joined the Diplomatic Wireless Service then worked his way up to becoming Head of Broadcast Group in 1979 leading to Chief Engineer and Head of Communications Engineering Department (CED) in 1981. During his service a CBE followed his MBE. Retired age 66.


Click here to read more and to register for this event.

Kris also suggested this article and this article as a little background and worth reading prior to the lecture.

Thank you for the tip, Kris!

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Short recording of BBC World Service in DRM

Many thanks to SWLing Post contributor, Mangosman, who shares the following off-air recording via the KiwiSDR network and notes:

Attached is a diagram showing the path and the receiver data, the end of a one hour daily broadcast is in the other file. They switched the transmitter back to AM before the end of the station promo.

I listened to the same broadcast on the previous day. It did not have any disturbances over that time. The quality was identical.

That’s a great decode of the BBC in DRM. Thanks for sharing! DRM is such an amazing mode when you get consistent and stable reception. Here in North America, that can be very difficult to achieve, but it’s fascinating when it does happen! Thanks for sharing!

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CBQM Fort McPherson documentary

CBQMMany thanks to SWLing Post contributor, Ted Ostrowski, who writes:

Hey Thomas

Thought your SWListeners might enjoy this bit of Canadiana. It’s a bit dated and cheesy, but radio buffs may enjoy it. I did.

Ted

CBQM

This feature-length documentary pays tribute to CBQM, the radio station that operates out of Fort McPherson, a small town about 150 km north of the Arctic Circle in the Canadian Northwest Territories. Through storytelling and old-time country music, filmmaker and long-time listener Dennis Allen crafts a nuanced portrait of the “Moccasin Telegraph,” the radio station that is a pillar of local identity and pride in this lively northern Teetl’it Gwich’in community of 800 souls.

CBQM, Dennis Allen, provided by the National Film Board of Canada

This is wonderful, Ted, thank you for sharing!

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Bill Rogers and the “Lost Radio”

Many thanks to SWLing Post contributor, Bill Rogers, for the following guest post:


“Lost Radio”

by Bill Rogers

When I was ten years old I lost my first wristwatch and my first radio. I think I have been trying to get them back ever since.

It was all part of a rather catastrophic family vacation trip around the Canadian side of Lake Huron, Port Huron across to Sarnia and then up around the shores of Georgian Bay all the way to Sault Sainte Marie and points north.

We had planned to go on around the north shore of Lake Superior too. We drove north to Wawa and saw the Goose statue. Then we headed north from there.

This was a long, long time ago, so I may misremember. But as I recall it, the Goose memorialized the completion of the Trans Canada Highway, and once past it you were really getting into the back end of beyond.

Not far past the Goose we came to what looked like a tollbooth, which surprised us. We hadn’t been aware there were any tolls along the Trans Canada. Dad pulled up and stopped.

“Hello,” the uniformed officer inside said. “Where ya going?”

“On around Superior.”

“Good. When do you expect to get to Thunder Bay?”

Dad was curious. “Why do you need to know?”

“Oh, for your own safety. So we know to send out a search if you don’t make it.”

Dad looked around and back at all of us. “I think we should head back instead.”

It was a wise choice. It had been a fun trip but it had a few challenges, so to speak.

We were five people in a white 1965 Dodge Coronet 440 pulling an old travel trailer we’d borrowed from one of my cousins. The Dodge was a comfortable car- it had an add-on air conditioning unit that occupied a good chunk of the space under the dashboard, and a radio (AM only of course) that worked well, and these were great luxuries at the time.

Dad had bought it used from his School District after it had served for a good while as a driver’s education car. First call on surplus vehicles was one of the benefits of working for the school district, but I don’t think being hammered by all those would-be new drivers had done the Dodge any good.

We’d borrowed the trailer. It was a heavy thing. The Dodge strained to pull it even though the car had a big V-8 engine. The trailer wasn’t big either. I remember wood paneling and too-small windows that kind of opened to let the inside heat and outside heat mingle when you stopped for the night and tried to sleep. Dad grumbled that the trailer weighed twice as much as a newer one would have.

Having borrowed a trailer to use one time only, Dad hadn’t gone big bucks on the trailer hitch. It simply clamped to the back bumper. Somewhere near Sudbury the bumper started to rip off.

That was another reason we wimped out and didn’t go on around Superior. We were behind schedule. The loose bumper had made us lose several travel days.

We’d limped into the nearest campground on Friday and stayed there while Dad wandered around to locate someone to weld the bumper back on. On Monday he did. “Guy said ‘This isn’t strong enough to pull anything heavy, I’d better weld on a couple bars fastening it direct to the frame.’ I told him that was a good idea.”

Along the way we’d seen much beautiful countryside and lots of rock cuts for the highway. Rock cuts impressed me since I was from southern Michigan where actual surface geology is unknown.

We bought a pretty basket of fruit at a farmer’s market and were 30 miles down the road before we found that everything below the top layer was green or rotten.

I had my transistor radio and was listening to it in the back seat. This was my first radio. It was a prized Christmas gift and made my sister jealous. “I was two years older than him before I got a radio,” she sniffed. She kept track of things like that.

My radio was branded “Sportsman.” That meant it came from the local hardware store where they also sold Sportsman brand outdoor gear and Sportsman brand rifles and shotguns.

I have no idea who actually made it. I can’t remember what it looked like. I do remember it had a Genuine Leather case and an earphone for private listening.

It didn’t work well in the back seat of the car, but I could get something if I held the radio up near the window. I listened to the different Canadian radio stations and noticed for the first time that Ontario English sounds just slightly different from my own, in a way that I can’t really describe. The difference is tiny but it is there. In Ontario they do not say “out and about in a boat” as “oot and aboot in a boot” as we on this side of the Lake say they do, but there is the tiniest twist to the end of the vowels in that direction. I can’t do it and I’ve made myself crazy trying.

At one point I picked up a Morse Code transmission at the lower end of the band, obviously a non directional beacon at the upper end of the longwave navigation frequencies. I played it for everyone in the car. They were not impressed. This is the first time that I learned most people aren’t as intrigued by odd radio signals as I am.

But I kept amusing myself with the radio. I borrowed our Province of Ontario official road map. As many road maps did, at the time, it had a listing of some of the more powerful radio stations, by city. That gave me signals to try for. I tried for the nearer ones and even received some of them.

The campground where we were laid up to have the car welded together was in an Ontario Provincial Park. The place was crowded because of some Boy Scouts gathering, but they found a place for us.

We went to the beach and did not feed the seagulls, since we were trying to be polite and proper and a sign said not to. But the gulls impressed me. Somebody must have been feeding them; there was a regular cloud of them.

We came back to find our trailer door pried open and a number of small valuables gone. Among them were my dad’s transistor radio and mine; Dad’s was his constant companion and must have been one of the first. Dad’s cheap wrist watch and my child size, hand-wound Timex watch were gone too.

The most expensive item missing was Dad’s “Palomar” binoculars. (In case you don’t know, the Mount Palomar Observatory contains what was the largest telescope in the world for many years. It is still there, although with creeping streetlights making sky glare all across Southern California I doubt it is able to do as much research as it once did.) Transistor radios were still fairly costly back then, but binoculars cost a fortune.

We reported the theft to the park rangers who didn’t care. Eventually one of them brought the binoculars back. “You left them on a picnic table on the far side of the park, near the Boy Scouts groups,” he said. Which was quite a trick, in that we hadn’t gone to that side of the park. Also he never explained why we would have smeared soap over all the lenses.

But the soap cleaned off easily and caused no permanent harm. My sister still has that set of binoculars. The watches and radios and whatever other small items we lost which (coincidentally, no doubt) could have fit unnoticed in a Boy Scout’s pockets or pack were never seen again, at least by us.

Anyway, after the car was welded back together we continued on our way. We got as far as Wawa. From there we headed back south, crossed the International Bridge and the Mackinaw Bridge, and went home.

The transmission on the Dodge never was quite right after hauling that heavy trailer so far. That contributed to that car’s early demise. (Of course it was the cheaper of the optional automatic transmissions, the two speed model instead of the three speed. The two speed automatic transmissions were always pretty crappy anyway.)

Today my home is crowded with more radios and watches than I know what to do with. Here at my writing desk I have three of each within sight, and there are plenty more here and there around the place.

I think I may have them all because I am trying in vain to get back that Sportsman AM transistor radio and that child-size Timex watch, the first radio and watch I ever had, the ones never saw again and never will. The sorrow of their loss might explain why I have collected so may others. It doesn’t explain the fountain pens, though.

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Radio Waves: “Shady” 5G, Chip Shortage Affects Radio Tech, CW Contesting’s “Secret Storm,” ARRL to Cover Youth FCC App Fees, and ARRL Response to Insulin Pump Story

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 Wilbur Forcier, Dan Van Hoy, and the Southgate ARC for the following tips:


Special operators are already dealing with a shady piece of Chinese technology the US has been warning about. (Business Insider via MSN)

  • The spread of 5G mobile communications technology is creating new problems for the US military.
  • Compromised networks could give adversaries an opportunity to monitor and attack US personnel.
  • See more stories on Insider’s business page.

In an increasingly interconnected world, the US military is facing new challenges in old stomping grounds.

Even though the US isn’t at war with China, competition with Beijing is already raging, and conventional and special-operations troops deployed around the world are exposed, either directly or through proxies, to Chinese technology that could hinder them in a conflict.

The worst offender is 5G, the same mobile communications technology ordinary people use or will be using in the future.

[…]However, Chinese firm Huawei – which is suspected of stealing its 5G technology from a Canadian firm through cyberattacks – has been deploying its 5G technology worldwide.

Given China’s peculiar national security laws, which require individuals and companies to cooperate with the Chinese security services, any Huawei technology around the world is a potential threat to privacy and national security. Through Huawei, Beijing could spy on or disrupt infrastructure and operations during peace or war.

Governments have realized the danger and have been banning Huawei from their networks. The British government did so in 2020, and the US Federal Communications Commission designated Huawei a national security threat in 2021, following several Chinese cyberattacks.[]

Chip Shortage Hits Radio Technology Marketplace (Radio World)

The severity of the global computer chip shortage has broadcast equipment manufacturers finding creative ways to manage supply channels while trying to meet product demand.

Despite the semiconductor shortages, people in the radio technology marketplace who spoke with Radio World say products are still being shipped, with mostly minor delays, thanks to prior planning. Equipment suppliers said they hope the semiconductor shortage will ease soon, perhaps by early 2022.

Continue reading

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Guest Post: Mediumwave DXing in Botswana

Many thanks to SWLing Post contributor, Peter Wilson, who shares the following guest post and recordings from his listening post in Botswana:


Peter’s receiver is a Airspy HF+ Discovery SDR using SDR Console V3

MWDX from Australia and the USA received in Botswana

by Peter Wilson

Hello Thomas.

I moved my 16.2 metre random wire slightly farther away from the house, and installed a binocular balun and connected 20m of RG58 at the far end, not the “house end”.

Peter’s random wire antenna with binocular balun

Reception examples:

1500 USA WFED Washington DC 12790km

1152 AUS 6PB
ABC NewsRadio Busselton 8469km with ABC News ID

1600 B Radio Nove de Julho ID 7234km
Sao Paulo. Brazil. ID,
Web Address and jingle. Rinsed and repeated.
Portuguese: Radio Nove de Julho [English: Radio 9th July]

1026 kHz MOZ Emissor Provincial de Manica Chimoio 1057km.
A bit parochial but features the radio Mozambique song.

850 USA WTAR Norfolk, Virginia Fox Sports Radio ID 12700km

1296 6RN ABC Radio National. Wagin, Australia 10kW 8644km

558 AUS 6WA ABC Great Southern WA Wagin 8644km


Impressive reception from your home in Botswana! Thank you so much for sharing these recordings, Peter. You’ve certainly made the most of your random wire antenna!

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