Tag Archives: Radio Astronomy

Fast Radio Bursts (FRBs) from a distant galaxy detected

Many thanks to a number of SWLing Post contributors who’ve shared the following news:

(Source: Southgate ARC)

Mysterious radio signals from deep space detected

BBC News report astronomers have revealed details of mysterious signals emanating from a distant galaxy, picked up by a telescope in Canada.

The precise nature and origin of the blasts of radio waves is unknown.

Among the 13 fast radio bursts, known as FRBs, was a very unusual repeating signal, coming from the same source about 1.5 billion light years away.

Such an event has only been reported once before, by a different telescope.

“Knowing that there is another suggests that there could be more out there,” said Ingrid Stairs, an astrophysicist from the University of British Columbia (UBC).

“And with more repeaters and more sources available for study, we may be able to understand these cosmic puzzles – where they’re from and what causes them.”

The CHIME observatory, located in British Columbia’s Okanagan Valley, consists of four 100-metre-long, semi-cylindrical antennas, which scan the entire northern sky each day.

The telescope only got up and running last year, detecting 13 of the radio bursts almost immediately, including the repeater.

Read the full BBC News article
https://www.bbc.co.uk/news/science-environment-46811618

Spread the radio love

“Radio on the Edges”: Robert’s lifelong pursuit

(Photo source: All Things Radio by Robert Gulley)

SWLing Post contributor, Robert Gulley (AK3Q), recently published a post on his blog discussing the edges of radio reception and his pursuit of DX in all forms. I think this article speaks to many of us.

(Source: All Things Radio by Robert Gulley)

Radio on the Edges can mean a number of different things, depending on one’s perspective. For me, at the moment, it means distance. It means reaching the edges of where a signal can go.

One of the more intriguing aspects of radio is just how far a signal will travel. I have been a DX chaser for years, starting with AM Broadcast signals when I was a kid. The further the station, the cooler the signal in those days.

Then of course there was Shortwave radio. Now that was cool! That was real DX! Hearing countries from around the world was just the best! Well, that it, the best until I became an amateur radio operator and could send signals around the world! Whoo-Hoo! Hot Dog! Oh yeah, baby!!

Still to do on my DX list is to bounce a signal off the moon. Technically my signals have already gone into space, to the ISS and to orbiting satellites. But the moon so far has eluded me. Well at least, confirmation of bouncing off the moon back to myself or to another amateur has so far eluded me.

But Radio on the Edges also means a different kind of DX.[…]

Click here to continue reading on Robert’s excellent site, All Things Radio.

Spread the radio love

Scott Tilley (VE7TIL): The Amateur Astronomer Who Found a Lost NASA Satellite

Many thanks to SWLing Post contributor, Cap Tux, who shared a link to the following video on YouTube. This short video is brilliant and will be the reference I use when people ask about the intersection of radio and amateur astronomy:

Click here to view on YouTube.

Amateur astronomer Scott Tilley made international headlines when he rediscovered NASA’s IMAGE satellite 13 years after it mysteriously disappeared. In this interview with Freethink, Scott discusses his role in the satellite’s recovery, why he enjoys amateur astronomy, and how citizen scientists like him have contributed to our knowledge of space from the space race to the present day.

And I personally think our Post friend, Troy Riedel–who is an avid amateur astronomer–should start tracking satellites! (We’ll see if he’s reading this post!)

I’m curious: are there any Post readers who are into the satellite tracking side of amateur astronomy?

Spread the radio love

Radio enthusiasts receive images from the Longjiang-2 in lunar orbit

Image received by astronomer Cees Bassa (@cgbassa) using the Dwingeloo Telescoop

Many thanks to SWLing Post contributor, Eric McFadden (WD8RIF) who shares the following story from The Planetary Society:

Earlier this week, on October 10, radio amateurs all around the world worked together to get the Chinese Longjiang-2 spacecraft to take an image of the Earth and the far side of the Moon. Radio commands were generated by MingChuan Wei in China, transmitted to the spacecraft by Reinhard Kuehn in Germany after which they were received by the spacecraft in lunar orbit. In turn, the spacecraft transmitted the image back to Earth, where it was picked up by radio amateurs in Germany, Latvia, North America and the Netherlands.

Since June this year, the Chinese Longjiang-2 (also known as DSLWP-B) microsatellite has been orbiting the Moon. The satellite is aimed at studying radio emissions from stars and galaxies at very long wavelength radio waves (wavelengths of 1 to 30 meters). These radio waves are otherwise blocked by the Earth’s atmosphere, while the lunar environment offers protection from Earth-based and human-made radio interference. Longjiang-2 was launched to the Moon together with an identical twin, Longjiang-1 (DSLWP-A), together acting as a radio interferometer to detect and study the very long wavelength radio waves by flying in formation in lunar orbit.

Besides the scientific instruments, both Longjiang satellites carry a VHF/UHF amateur radio transmitter and receiver (a transceiver) built and operated by the Harbin Institute of Technology (in Chinese). The Longjiang-2 transceiver also includes an onboard student camera, nicknamed the Inory Eye. The Harbin team built on experience gained with the Earth-orbiting LilacSat-1 and LilacSat-2 nanosatellites, which allow radio amateurs to receive satellite telemetry, relay messages and command and download images taken with an onboard camera.

While receiving signals from satellites in low Earth orbit requires only relatively simple antennas, doing so for satellites in orbit around the Moon (a thousand times more distant), is much harder. To this end Longjiang-1 and 2 transmit signals in two low data-rate, error-resistant, modes; one using digital modulation (GMSK) at 250 bits per second, while the other mode (JT4G) switches between four closely spaced frequencies to send 4.375 symbols per second. This latter mode was developed by Nobel-prize winning astrophysicist Joe Taylor and is designed for radio amateurs to relay messages at very low signal strengths, typically when bouncing them off the surface of the Moon.

[M]any radio amateurs have been able to receive transmissions from Longjiang-2. Usually, the transceiver is powered on for 2-hour sessions at a time, during which GMSK telemetry is transmitted in 16-second bursts every 5 minutes. After some testing sessions in early June, the JT4G mode was activated, with 50 second transmissions every 10 minutes.

Specialized open source software written by MingChuan Wei and the Harbin team enables radio amateurs to decode telemetry as well as image data and upload it to the Harbin website.

The JT4G mode has allowed radio amateurs with small yagi antennas to detect signals from Longjiang-2 (using custom software written by Daniel Estévez).[…]

Click here to read the full article at The Planetary Society.

This is fascinating, Eric!  Thank you for sharing. It would be amazing fun to grab one of these Lunar signals! Anyone up to the task?

Spread the radio love

Ruby Payne-Scott: a pioneer in radio astronomy

(Source: New York Times via Howard Bailen)

Since 1851, obituaries in The New York Times have been dominated by white men. With Overlooked, we’re adding the stories of remarkable people whose deaths went unreported in The Times.

By Rebecca Halleck
Every so often our sun emits an invisible burst of energy.

This energy ripples through space as electromagnetic waves and then crashes into planets and meteors and space debris and one another, causing a great cacophony above and around us.

A cacophony that was inaudible, until Ruby Payne-Scott entered a laboratory.

In the 1940s, Payne-Scott helped lay the foundation for a new field of science called radio astronomy. Her work led to the discovery of deep-space phenomena like black holes and pulsars and later helped astronauts understand how solar storms disrupt weather in space and electrical grids on Earth.

Yet as a married woman she was denied equal employment status and compensation. She challenged the scientific establishment in her native Australia and fought for the rights of women in the workplace, but ultimately left science to raise her children full time.

World War II opened the door to Payne-Scott’s scientific career. The Australian armed forces needed physicists, and men were joining the military to fight instead.[…]

Continue reading the full article at the NY Times.

Spread the radio love