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Many thanks to SWLing Post contributor, Dave Porter, who writes:
This picture [above] has just emerged, photographer unknown but most likely a rigger from the top of one of the 700′ masts there!
This was taken at Droitwich sometime after colour photography came in (late 1960’s) and before 1986 when the four wire Tee was replaced by a new design developed by BBC Antenna Engineer Tony Preedy, G3LNP that improved upon the 11-j85 Ohms driving point impedance giving a few more ohms and less capacitive reactance for the 2 x 250kW B6042 transmitters and a greater radiation efficiency.
Tony’s present LF array does not look so symmetrical as it comprises four separate Tee wires with the drops as a square box rather than the centre-joined drops of this one.
Tony also developed a low profile Tee antenna over 3 x 17m wooden telegraph poles for MF at up to 1 kW that was used when planning restrictions were enforced. Efficiencies were up to 40% at the 1500 kHz end of the band. However, if used by birds as an overnight roost it could provoke VSWR trips on solid state transmitters, the fix was to use a sliding reduced power detector that wound down the power to a level that did not trip the VSWR monitoring. Old tube transmitters were not affected!
The operating frequency for this LF Tee was 200 kHz at that time, now the antenna is on 198 kHz
Wow–thank you, Dave, for sharing this photo. We truly appreciate your impressive knowledge of UK broadcasting and history! And, wow! The views those riggers took in!
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’sRadio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!
Many thanks to SWLing Post contributors Skip Arey, David Goren, Paul Evans, Kanwar Sandhu and Dave Porter for the following tips:
MEXICO CITY (Reuters) – The young technician shut off the electricity at a cellular tower in rural Mexico to begin some routine maintenance.
Within 10 minutes, he had company: three armed men dressed in fatigues emblazoned with the logo of a major drug cartel.
The traffickers had a particular interest in that tower, owned by Boston-based American Tower Corp (AMT.N), which rents space to carriers on its thousands of cellular sites in Mexico. The cartel had installed its own antennas on the structure to support their two-way radios, but the contractor had unwittingly blacked out the shadowy network.
The visitors let him off with a warning.
“I was so nervous… Seeing them armed in front of you, you don’t know how to react,” the worker told Reuters, recalling the 2018 encounter. “Little by little, you learn how to coexist with them, how to address them, how to make them see that you don’t represent a threat.”
The contractor had disrupted a small link in a vast criminal network that spans much of Mexico. In addition to high-end encrypted cell phones and popular messaging apps, traffickers still rely heavily on two-way radios like the ones police and firefighters use to coordinate their teams on the ground, six law enforcement experts on both sides of the border told Reuters.[…]
If you’ve been binge-watching movies lately, you may have come across “Pirate Radio.” Director Richard Curtis’ 2009 comedy-drama stars the late Philip Seymour Hoffman as The Count, a disc jockey for an unlicensed rock radio station that broadcast from a rusty, decrepit ship off the British coast in the mid-1960s, defying government authorities to spin the rock records that weren’t allowed on the BBC at the time. The plot is based loosely on the saga of an actual former pirate station, Radio Caroline, that was founded by an offbeat Irish entrepreneur named Ronan O’Rahilly, the inspiration for the character portrayed by Bill Nighy.
“Pirate Radio” is a period piece, set in a time when the Rolling Stones’ “Let’s Spend the Night Together” and the Who’s “My Generation” were still scandalous and controversial rather than nostalgic anthems for today’s aging baby boomers. So you couldn’t be blamed for assuming that it depicts a long-vanished phenomenon, like Nehru jackets with iridescent scarves and psychedelic-patterned paper mini dresses.
To the contrary, though, more than a half-century later, pirate radio is still a thing. In fact, it’s possibly more widespread than it was in the 1960s, even in an age when streaming internet services such as Spotify and Pandora put the equivalent of a jukebox in the pocket of everyone with a smartphone. And as a bonus, Radio Caroline still exists — though, ironically, it’s gone legal.[…]
[Note: Arqiva is the UK domestic broadcast transmission provider.]
Arqiva is working on a restructure of its business that could result in a third of its staff being made redundant.
According to a report in the Telegraph, the media infrastructure business is preparing to cut around 500 staff, which is approximately a third of its workforce.
An Arqiva spokesperson confirmed to IBC365 that some job losses will occur.
They said: “The sale of our telecoms business makes Arqiva a smaller organisation, changes our revenue profile and reduces our available profit pool.
”We are therefore conducting a review of the costs and systems we need to run our business over the next three years.
”Regrettably, we will need to reduce the size of our workforce, but it’s much too early to speculate about numbers.”
The Telegraph report cites the shift to streaming and a drop in income for broadcasters as reasons for the potential cuts.[…]
In the middle of a Russian swampland, not far from the city of St Petersburg, is a rectangular iron gate. Beyond its rusted bars is a collection of radio towers, abandoned buildings and power lines bordered by a dry-stone wall. This sinister location is the focus of a mystery which stretches back to the height of the Cold War.
It is thought to be the headquarters of a radio station, “MDZhB”, that no-one has ever claimed to run. Twenty-four hours a day, seven days a week, for the last three-and-a-half decades, it’s been broadcasting a dull, monotonous tone. Every few seconds it’s joined by a second sound, like some ghostly ship sounding its foghorn. Then the drone continues.
Once or twice a week, a man or woman will read out some words in Russian, such as “dinghy” or “farming specialist”. And that’s it. Anyone, anywhere in the world can listen in, simply by tuning a radio to the frequency 4625 kHz.
It’s so enigmatic, it’s as if it was designed with conspiracy theorists in mind. Today the station has an online following numbering in the tens of thousands, who know it affectionately as “the Buzzer”. It joins two similar mystery stations, “the Pip” and the “Squeaky Wheel”. As their fans readily admit themselves, they have absolutely no idea what they are listening to.[…]
Many thanks to SWLing Post contributor, Dave Porter (G4OYX), who shares the following:
Here’s Steve Gale in the late 80’s or early 90’s starting a wavechange on a Marconi BD272 250 kW sender at SKA.
There were eventually 11 of these senders at the BBC Skelton A site.
The first pic is the Final RF amplifier output stage with the 15/17 MHz coil being in situ. It sits between the two anodes of the output tubes.
Below the anode coil sits the coupling coil and it is on a motorised deck, that can be moved backwards and forwards on power to couple up to the required power output.
Steve is just starting the band change as he is wearing the leather gauntlets because after a transmission the coils are very hot.
Both the anode and coupling coils will be removed and replaced by those for the next required frequency.
A fifteen minute period was allocated by the BBC WS Schedule Department to accomplish a band change though two of us could do them in about eight minutes if pushed!
The picture below shows Steve starting to remove one of the pair of the 3-turn 40 kW Penultimate stage to Final stage coupling coils, again he is wearing the gauntlets. A different coil will be used for the next band.
The three turn coil covered 9, 11 and 15 MHz.
All those senders have gone now at Skelton.
Two are still in use at Woofferton and some in Singapore.
Thanks so much for sharing this glimpse into a working shortwave radio transmitting station, Dave! There’s nothing QRP about those transmitters and I bet those coils got incredibly hot!
Control room at the Edward R. Murrow Transmitting Station near Greenville, NC.
Many thanks to SWLing Post contributor, Dave Porter, who shares the following news item from Glenn Hauser’s World of Radio:
Radio Marti has cancelled all programming via Greenville between 0400 and 1000 UTC effective from 2 May. During this period the only transmission left from Greenville is 0600-0630 VOA French on 9885. This may be the beginning of the end for Greenville. (Glenn Hauser WOR)
Thanks for sharing this, Dave. Sad news, indeed. The Greenville site has stared shutdowns in the face a number of times in the past and survived. This year, in particular, could be a challenge with Covid-19 affecting broadcasting budgets across the globe and with the current US administration not showing much love for the VOA.
We’ll follow this closely and post updates when available.
Many thanks to SWLing Post contributor, Dave Porter, who shares a link to the following BBC Archive video of BBC RMP circa 1961. The BBC posted this video in light of the recent demolition of all but one of the original Rampisham Down towers.
