https://github.com/GyanD/codexffmpeg/releases/tag/2023-03-05-git-912ac82a3c

RSID: <<2024-10-03T23:31Z MFSK-32 @ 9265000+1500>>
 

Welcome to program 373 of Shortwave Radiogram.

I'm Kim Andrew Elliott in Arlington, Virginia USA.

Here is the lineup for today's program, in MFSK modes as noted:

  1:47 MFSK32: Program preview (now)
  3:03 MFSK32: SS United States to Become Artificial Reef*
  8:44 MFSK64: Technique to increase capacity of LEO satellites
12:39 MFSK64: This week's images*
28:39 MFSK32: Closing announcements

* with image(s)


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From gCaptain:

Historic SS United States to Become World's Largest Artificial
Reef Off Florida Coast

Mike Schuler
October 2, 2024

The city of Destin-Fort Walton Beach, Florida, and the SS United
States Conservancy have announced an agreement to convert the
iconic SS United States into the world's largest artificial reef.

The development comes after the Okaloosa County Board of County
Commissioners approved a contingent contract to acquire the
historic ocean liner, subject to the conclusion of a U.S.
District Court-imposed mediation.

The SS United States, launched in 1951, still holds the
transatlantic speed record and has a rich history of transporting
presidents, celebrities, and immigrants. Designed as a
convertible troop carrier during the Cold War, the vessel could
transport 14,000 troops 10,000 miles without refueling.

The agreement for the ship's purchase follows a legal dispute
between the SS United States Conservancy—the nonprofit
organization that owns the ship—and Penn Warehousing, the pier
operator where the ship has been docked since 1996. The conflict
arose when Penn Warehousing raised the rent for the ship's berth
at Pier 82 in Philadelphia, resulting in an eviction notice.
Although the Conservancy had previously stated that reefing
wasn't their preferred outcome, they acknowledged it as a "more
dignified option" compared to scrapping, which was the only other
viable alternative.

"This accomplishment confirms our commitment to remain good
stewards of the environment, while also enhancing our community's
status as a premier diving and fishing destination," said
Okaloosa County Board Chairman Paul Mixon.

The project, estimated to cost up to $10.1 million, includes the
acquisition, remediation, transport, and deployment of the ocean
liner. It also provides partial funding for a land-based museum
to showcase the ship's history.

"The SS United States has inspired millions the world over as a
symbol of American pride and excellence," said Susan Gibbs,
Conservancy President. "Converting the world's fastest ship into
the world's largest artificial reef will write a new chapter for
the SS United States as a world class destination."

The Florida Fish and Wildlife Conservation Commission projects a
13,800% return on investment for artificial reefs in the Florida
Panhandle, highlighting the economic potential of this project.

The process is expected to take over a year for environmental
remediation, with an additional six months to a year for
deployment. The exact location off Destin-Fort Walton Beach has
not been determined, but it will be accessible to divers of
various skill levels.

https://gcaptain.com/historic-ss-united-states-to-become-worlds-largest-artificial-reef-off-florida-coast/
 

Image: The SS United States in 1952 ...

Sending Pic:202x93C;


 

Shortwave Radiogram now changes to MFSK64 ...


 

RSID: <<2024-10-03T23:38Z MFSK-64 @ 9265000+1500>>


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From Princeton University:

Simple shift could make low Earth orbit satellites high capacity

By Alaina O'Regan
September 12, 2024

Low-orbit satellites could soon offer millions of people
worldwide access to high-speed communications, but the
satellites' potential has been stymied by a technological
limitation — their antenna arrays can only manage one user at a
time.

The one-to-one ratio means that companies must launch either
constellations of many satellites, or large individual satellites
with many arrays, to provide wide coverage. Both options are
expensive, technically complex, and could lead to overcrowded
orbits.

For example, SpaceX went the "constellation" route. Its network,
StarLink, currently consists of over 6,000 satellites in
low-Earth orbit, over half of which were launched in the past few
years. SpaceX aims to launch tens of thousands more in the coming
years.

Now, researchers at Princeton Engineering and at Yang Ming Chiao
Tung University in Taiwan have invented a technique that enables
low-orbit satellite antennas to manage signals for multiple users
at once, drastically reducing needed hardware.

In a paper published June 27 in IEEE Transactions on Signal
Processing, the researchers describe a way to overcome the
single-user limit. The strategy builds on a common technique to
strengthen communications by positioning antenna arrays to direct
a beam of radio waves precisely where it's needed. Each beam
carries information, like texts or phone calls, in the form of
signals. While antenna arrays on terrestrial platforms such as
cell towers can manage many signals per beam, low-orbit
satellites can only handle one.

The satellites' 20,000 mile-per-hour speed and constantly
changing positions make it nearly impossible to handle multiple
signals without jumbling them.

"For a cell tower to communicate with a car moving 60 miles per
hour down the highway, compared to the rate that data is
exchanged, the car doesn't move very much," said coauthor H.
Vincent Poor, the Michael Henry Strater University Professor of
Electrical and Computer Engineering at Princeton. "But these
satellites are moving very fast to stay up there, so the
information about them is changing rapidly."

To deal with that limitation, the researchers developed a system
to effectively split transmissions from a single antenna array
into multiple beams without requiring additional hardware. This
allows satellites to overcome the limit of a single user per
antenna array.

Coauthor Shang-Ho (Lawrence) Tsai, professor of electrical
engineering at Yang Ming Chiao Tung University, compared the
approach to shining two distinctive rays from a flashlight
without relying on multiple bulbs. "Now, we only need one bulb,"
he said. "This means a huge reduction in cost and power
consumption."

A network with fewer antennas could mean fewer satellites,
smaller satellites, or both. "A conventional low Earth orbit
satellite network may need 70 to 80 satellites to cover the
United States alone," Tsai said. "Now, that number could be
reduced to maybe 16."

The new technique can be incorporated into existing satellites
that are already built, according to Poor. "But a key benefit is
that you can design a simpler satellite," he said.

Impacts in space

Low-orbit satellites reside in the lower layer of Earth's
atmosphere, between 100 and 1,200 miles from the surface. This
region of space offers limited real estate. The more objects
flying around, the more likely they are to crash, breaking apart
and releasing smaller fragments of debris that can then crash
into other objects.

"The concern there isn't so much getting hit by a falling
satellite," Poor said, "But about the long-term future of the
atmosphere, and the orbit being clouded up with space debris
causing problems."

Because the low-orbit satellite industry is gaining traction at a
rapid pace, with companies including Amazon and OneWeb deploying
their own satellite constellations to provide internet service,
the new technique has the potential to reduce the risk of these
hazards.

Poor said that while this paper is purely theoretical, the
efficiency gains are real. "This paper is all mathematics," he
said. "But in this field in particular, theoretical work tends to
be very predictive."

Since publishing the paper, Tsai has gone on to conduct field
tests using underground antennas and has shown that the math
does, in fact, work. "The next step is to implement this in a
real satellite and launch it into space," he said.

The paper "Physical Beam Sharing for Communications with Multiple
Low Earth Orbit Satellites" by Yan-Yin He, Shang-Ho (Lawrence)
Tsai and H. Vincent Poor was published June 27 in IEEE
Transactions on Signal Processing.

https://engineering.princeton.edu/news/2024/09/12/simple-shift-could-make-low-earth-orbit-satellites-high-capacity
 

This is Shortwave Radiogram in MFSK64

Please send your reception report to radiogram@verizon.net
 

This week's images ...


A person poses inside an art installation by Yayoi Kusama at the
Victoria Miro gallery in London, September 23.
https://tinyurl.com/2yakp8e6 ...

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People dive from a platform in the sea at sunset in Noumea, New
Caledonia, September 25. https://tinyurl.com/2yakp8e6 ...

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Utility companies restoring power in Perry, Florida after
Hurricane Helene. https://tinyurl.com/224rblpq ...

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People gather around an installation called Back to Childhood at
the annual festival of light in Łódź, Poland.
https://tinyurl.com/23rst8xl ...

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A pile of Smarties (candy) photographed through wet glass. From a
BBC collection of still life photos. https://tinyurl.com/22fks9wq
...
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Sunset in Connell, Scotland. https://tinyurl.com/25s3p56c ...

Sending Pic:139x206C;










A downy swan feather and its reflection on the calm surface of
Harelaw Reservoir near Neilston, Scotland.
https://tinyurl.com/25s3p56c ...

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The partial solar eclipse seen from Hawaiʻi Volcanoes National
Park, October 2. https://tinyurl.com/25pvk7fd ...

Sending Pic:202x138C;








Our painting of the week is "Ansaku" (2017) by Atta Kwami (Ghana
1956-2021), oil on linen. https://tinyurl.com/2dpcqqzs ...

Sending Pic:141x216C;



 

Shortwave Radiogram returns to MFSK32 ...





 

RSID: <<2024-10-03T23:58Z MFSK-32 @ 9265000+1500>>
 

This is Shortwave Radiogram in MFSK32 ...


Shortwave Radiogram is transmitted by:

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Please send reception reports to radiogram@verizon.net

And visit http://swradiogram.net

Twitter: @SWRadiogram or twitter.com/swradiogram

I'm Kim Elliott. Please join us for the next Shortwave
Radiogram.
 

Here is a timeline of "data transmission via BC shortwave":

2013-03-16 - 2017-06-17   VoA Radiogram  000-220  USA (Continuation under private management as SWRG)
2013-08-31 - until now    KBC Radiogram           NL  (without count, earliest note in my chronicle)
2016-03-23 - 2017-01-14   DIGI DX         01- 44  UK  (Among other things also *.mid transferred)
2016-06-17 - 2019-01-01   IBC DIGITAL    001-134  I   (my own count)
2017-06-25 - until now    SWRG           001-371  USA (and further ongoing)
2017-11-?? - 2018-12-23   BSR Radiogram   01- 44  USA (Broad Spectrum Radio)
2018-07-25 - 2019-04-06   SSR Radiogram   01- 33  NL  (Slow Scan Radio)
2019-02-21 - 2023-08-03   TIAMS          001-222  CAN (This Is A Music Show)
2020-02-15 - until now    RNEI            01- 50  UK  (and further ongoing)
2020-03-07 - 2023-08-06   TIAEMS 03/2020-07/2023  CAN (This Is An Express Music Show)
2021-11-28 - until now    Pop Shop Radio          CAN (first find of a playlist in a spectrogram scan)
2023-04-16 - until now    Radio Carpathia         ROM (first find of a playlist in edition #8)

   
Projects with digital playlists or content: