Tag Archives: Jupiter

Radio Waves: Listening to Jupiter, Radio Emma Toc, Turkish Bans, and RT DE to Sue German Regulator

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!


Under a darkening sky, earthlings tune in to ‘Jupiter Radio’ (KLCC)

Ever eavesdrop on the planet, Jupiter? This past weekend, some radio enthusiasts gathered at Eugene’s Riverfront Field to do just that.

Roughly a dozen members of the Ducks on the Air Amateur Radio Club gathered on the grassy space (making sure to sidestep goose poops) to set up an array of cables and rods called a differential dipole antenna. They managed to assemble it and realign it just before Jupiter appeared on the dusky horizon. [Continue reading and listen to the audio at KLCC…]

Radio Emma Toc – celebrating wireless station 2MT – at 100! (Southgate ARC)

Dear Listener / Viewer

I’m pleased to let you know that I will be broadcasting another video stream this coming Monday, 14th February, with the theme of celebrating wireless station 2MT.

In 1922, after requests & petitions from radio hams in the United Kingdom, a licence was issued for station 2MT to transmit a programme of CW (morse), Telephony (voice) and music, on a weekly basis. Transmissions came from a small wooden hut in Writtle, Essex, where engineers working for the Marconi Company were given the task of putting on air a wireless station for ‘calibration purposes’ aimed at the growing number of radio hams and enthusiasts.

Over a short period, and with the good fortune of this Marconi team having a selection of gifted radio engineers & maverick individuals, 2MT became incredibly popular & – probably without realising it at the time – went on to lay the foundations of entertainment broadcasting that was to follow.

Monday the 14th February will be the centenary of the first transmission from 2MT. From 11am in the morning – 11:00UTC – we will be playing audio documentaries & videos looking at the start of broadcasting here in the UK, & then at around 6.45pm – 18:45UTC – I will present a live programme where hopefully we can all join in to drink a toast to ‘2MT’.

Our broadcast will not be a full history of the station, more a celebration of the people involved & everything that we enjoy about radio today. I hope to link with others celebrating 2MT & also radio hams on the air on this anniversary day.

I invite you to join me for this amateur enthusiast video broadcast!

Further details are available here:
 
Links & information relating to our broadcast stream:

Website – https://www.emmatoc.org/
Website page for this celebration – https://www.emmatoc.org/2mtcelebration
Link for viewing (only linking to us on the day of the broadcast) – https://www.mixcloud.com/live/RadioEmmaToc/
Facebook page – https://www.facebook.com/emmatoc
Twitter page – https://twitter.com/radioemmatoc

You can take part in the programme by emailing me with any comments & radio memories – I’d love to say hello to you – our email address is – [email protected]

Check our Facebook & Twitter pages for updates in case of any problems with transmissions (things can always go wrong!)

Our friends at Essex Ham have produced a short interview video with more detail – https://www.youtube.com/watch?v=uk_XnGvsJ0M

Links & information for other items of interest:

For radio hams, there will be two special event amateur radio stations in operation.
Local Radio Club CARS – Chelmsford Amateur Radio Society – will be operating GB100 2MT from Writtle Village Hall – http://www.g0mwt.org.uk/events/gb1002mt-writtle/index.htm
Radio Club Essex Ham will be operating GB2MTC from the East Essex Hackspace Hut in Hockley – http://sxham.uk/2mt

It is also hoped that items about 2MT will feature in programmes on the 14th on BBC Essex, Chelmsford Community Radio, & Phoenix FM. I will have more detail on this during my live stream, & if possible will link up with our friend Tim Wander at some time during the evening!

I look forward to being with you on the 14th!

Best wishes

Jim

DW, VoA and Euronews facing Turkish ban (Broadband TV News)

Turkey has given three international broadcasters a deadline of 72 hours to apply for local licences or be taken off the air.

“Deutsche Welle, Voice of America and Euronews have been given a deadline of 72 hours by the RTÜK. They must apply for a broadcast licence within that period or face a broadcast ban,” said Okan Konuralp, a member of the Turkish opposition Republican People’s Party (CHP) on Twitter.

At issue are the broadcasters’ websites that have drawn the attention of the authorities because they also feature video news. Such websites have become increasingly popular in Turkey as the government places restrictions on local news outlets.

If the broadcasters don’t apply for a licence the regulator has the right to go to court and get the website closed down. [Continue reading…]

RT DE to sue German regulator after broadcast ban (Broadband TV News)

RT DE says it plans to take legal action against Berlin’s media regulator after the German-language channel was ordered to shut down its streaming service.

The simmering row between Berlin and Russia has resulted in the imposition of restrictions on the German international broadcaster Deutsche Welle’s Russian operations.

“We believe that the regulatory authority acted unlawfully with its decision against RT DE Productions GmbH on February 2. The MABB claims that RT DE Productions GmbH is responsible for broadcasting the RT DE channel, blatantly ignoring the fact that the RT DE programme is managed and distributed by Moscow-based TV Novost,” said RT DE in a statement. [Continue reading…]


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Radio Waves: Solar Radios Help Kenyan Children, Synchronous AM’s History, FM Radio on Jupiter, and New WSJT mode Q65

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 Tracy Wood, Richard Langley, and the Southgate ARC for the following tips:


With schools shut by pandemic, solar radios keep Kenyan children learning (Thomson Reuters Foundation)

Solar-powered radios have been distributed to the poorest homes that lack electricity access, with lessons broadcast daily during the COVID-19 crisis – and perhaps beyond

TANA RIVER, Kenya, Dec 23 (Thomson Reuters Foundation) – Deep in Tana River County, in southeastern Kenya, a group of pupils formed a circle around their teacher, jotting down notes as they listened to a Swahili diction lesson coming from the solar-powered radio sitting in their teacher’s lap.

The radio the children from Dida Ade primary school gathered around was one of hundreds distributed for free to the most vulnerable households in the semi-arid region east of Kenya’s capital, Nairobi.

The radios allow children without internet access or electricity at home to continue studying while schools are closed to slow the spread of COVID-19, in a project that could also help children stay in education after the pandemic.

Funded by the Zizi Afrique Foundation, a Kenyan non-governmental organisation that produces research to drive education policy, the solar-powered radios also come with bulbs for household lighting and slots for phone-charging.

When schools across Kenya shut in March to slow the spread of COVID-19, Zizi Afrique did a survey in Tana Delta sub-county and found that just over one-fifth of households owned a radio and only 18% had access to electricity.[]

Synchronous AM’s Long and Tortuous History (Radio World)

AM boosters repeatedly have been proven effective, but the FCC consistently has declined to allow their wide use

With AM improvement on the radars of broadcasters and the FCC, there has been renewed talk in recent years about the subject of AM “boosters,” the carrier frequency synchronization of multiple transmitters. The commission opened a comment period on AM boosters in 2017.

It wasn’t the first time the FCC has explored this topic and failed to act on it. In fact, AM boosters have been proposed and tested dozens of times since the early days of radio. But even though the technology has repeatedly been proven effective, the commission consistently has declined to allow the operation of AM boosters on anything more than an experimental basis, for a variety of reasons.

Let’s take a moment to look back at the history of this beleaguered technology.

BOSTON REPEATER
In 1930, crystal control of transmitter frequencies was still an emerging technology, and the allowable frequency tolerance of a broadcast transmitter was +/- 500 Hz. Two stations operating on the same channel, even if widely geographically separated, could generate a heterodyne beat note of up to 1 kHz, a disconcerting annoyance to listeners.

Consequently, only a few stations were allowed to operate nationwide evenings on any one channel at the same time. Further, there were 40 clear-channel stations, each one having exclusive nationwide use of its frequency. As most of these clear-channel stations were network affiliates, many channels were wastefully duplicating the same programs.

In 1929, the respected radio engineer Frederick Terman proposed that, if all stations of the two networks (NBC and CBS) could synchronize their carrier frequencies within +/- 0.1 Hz to eliminate the heterodyne beat notes, they could all coexist on a single channel per network, freeing up dozens of channels for new stations.

Synchronization was first proved successful by the Westinghouse station WBZ in Springfield, Mass. Broadcasting from the roof of the Westinghouse factory, WBZ failed to cover Boston, so WBZA was opened as a Boston repeater. The two stations were synchronized on the same frequency beginning in 1926, using a tuning fork as a frequency reference.[]

FM Radio on Jupiter, Brought to You by Ganymede (EOS)

Another first from NASA’s Juno spacecraft: the detection of radio emissions from the Moon Ganymede, over a range of about 250 kilometers in the polar region of Jupiter.

Louis et al. [2020] present exciting new observations of radio emissions on Jupiter from the NASA Juno spacecraft – the first direct detection of decametric radio emissions originating from its Moon Ganymede. These observations were made as Juno crossed a polar region of the Giant Planet where the magnetic field lines are connected to Ganymede.

The radio emissions were produced by electrons at relativistic energy (a few thousand electron volts) in a region where the electron’s oscillation frequency (“plasma frequency”) is much lower than its gyration frequency (“cyclotron frequency”). Such electrons can amplify radio waves very close to the electron cyclotron frequency very rapidly, via a physical process called electron cyclotron maser instability (CMI). They can as well produce aurora in the far-ultraviolet – which was also observed by the camera on Juno.

Juno was traveling at a speed of approximately 50 kilometers per second, and it spent at least about 5 seconds crossing the source region of the emission, which was therefore at least about 250 kilometers in size.

The observed decametric radiation on Jupiter is clearly the “shorter cousin” (in wavelength) of the auroral kilometric radiation on both Earth and Saturn: the CMI being responsible for their production on the three planets.

Citation: Louis, C. K., Louarn, P., Allegrini, F., Kurth, W. S., & Szalay, J. R. [2020]. Ganymede?induced decametric radio emission: In situ observations and measurements by Juno. Geophysical Research Letters, 47, e2020GL090021. https://doi.org/10.1029/2020GL090021

Andrew Yau, Editor, Geophysical Research Letters[]

New WSJT mode Q65 (Southgate ARC)

WSJT-X 2.4.0 will introduce Q65, a digital protocol designed for minimal two-way QSOs over especially difficult propagation paths

On paths with Doppler spread more than a few Hz, the weak-signal performance of Q65 is the best among all WSJT-X modes.  Q65 is particularly effective for tropospheric scatter, ionospheric scatter, and EME on VHF and higher bands, as well as other types of fast-fading signals.

Q65 uses 65-tone frequency-shift keying and builds on the demonstrated weak-signal strengths of QRA64, a mode introduced to WSJT-X in 2016.  Q65 differs from QRA64 in the following important ways:
•A new low-rate Q-ary Repeat Accumulate code for forward error correction
•User messages and sequencing identical to those in FT4, FT8, FST4, and MSK144
•A unique tone for time and frequency synchronization.  As with JT65, this “sync tone” is readilyvisible on the waterfall spectral display.  Unlike JT65, synchronization and decoding are effective even when meteor pings or other short signal enhancements are present.
•Optional submodes with T/R sequence lengths 15, 30, 60, 120, and 300 s.
•A new, highly reliable list-decoding technique for messages that contain previously copied message fragments.

Read the new Q65 Quick Start Guide at
https://physics.princeton.edu/pulsar/k1jt/Q65_Quick_Start.pdf


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Jupiter’s radio noise

Many thanks to SWLing Post contributor, Bruce Atchison, who writes:

I came across this video last year and I thought you’d be interested in it. I also picked up Jupiter on my CB radio one morning. We all wondered what was generating those sounds of waves crashing on the beach. Later on, I learned about Jupiter’s powerful radio bursts.

Click here to view on YouTube.

Thanks for sharing this, Bruce!

I got a kick out of the narration–especially the subjective comment regarding the sound of Jupiter heard on radio: “The noise is disturbing…”

The narrator is obviously not a radio listener or astronomer! Ha ha!

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Receiving Jupiter with the SDRplay RSP1

I’ve been fascinated with radio astronomy since my university days. In the 1980s and 90s almost any radio astronomy experiment equated to forking out some serious money to purchase a wideband receiver (serious money to a student, at least). With the advent of SDRs, though, radio astronomy has become affordable for everyone.

Many thanks to RTL-SDR.com for publishing the following video and post about monitoring Jupiter radio bursts:

Over on YouTube user MaskitolSAE has uploaded a video showing him receiving some noise bursts from Jupiter with his SDRplay RSP1. The planet Jupiter is known to emit bursts of noise via natural ‘radio lasers’ powered partly by the planets interaction with the electrically conductive gases emitted by Io, one of the the planets moons. When Jupiter is high in the sky and the Earth passes through one of these radio lasers the noise bursts can be received on Earth quite easily with an appropriate antenna

In his video MaskitolSAE shows the 10 MHz of waterfall and audio from some Jupiter noise bursts received with his SDRplay RSP1 at 22119 kHz. According to the YouTube description, it appears that he is using the UTR-2 radio telescope which is a large Ukrainian radio telescope installation that consists of an array of 2040 dipoles. A professional radio telescope installation is not required to receive the Jupiter bursts (a backyard dipole tuned to ~20 MHz will work), but the professional radio telescope does get some really nice strong bursts as seen in the video.

Click here to view on YouTube.

Click here to read at RTL-SDR.com.

As Carl mentions above, you do not need a professional radio telescope to receive Jupiter noise bursts, a dipole will do.

In fact, the Pisgah Astronomical Research Institute (PARI) has a dedicated Jupiter receiver–a simple SDR kit called the Radio JOVE Receiver which is promoted by NASA. While PARI has the resources to install any number of antennas, PARI uses two simple dipoles which are mounted only a few feet off the ground as their radio telescope. I doubt their investment in the antennas exceeded $50. It works brilliantly.

The Radio JOVE receiver at PARI

I had planned to purchase and build a JOVE receiver (and, for fun, still may!), but it would be much easier to simply use the SDRplay RSP I already have in my shack. What a great project this fall.

Post readers: Please comment if you’ve used an SDR or JOVE kit to receive Jupiter bursts!

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