QST is the official publication of the Amateur
Radio Relay League (ARRL), the world's oldest and
largest organization for Ham radio enthusiasts. Many amateur radio operators also have an interest in
astronomy and as such, occasionally articles appear covering topics on amateur radio astronomy. There
are also quite a few articles dealing indirectly with aspects of astronomy such as Earth-Moon-Earth
(EME) communications where signals are bounced off the moon's surface in order to facilitate transmission
(although it is really more of a hobby achievement).
The October 2012 edition of QST had an article entitled, "Those Mysterious
Signals*," which discusses galactic noise in the 10-meter band. Arch Doty (W7ACD) writes about the
low-level background noise that is persistent in the high frequency (HF) bands. At HF, Cygnus A
and Cassiopeia A are major sources of cosmic noise, for example. Low level signals come from pulsars,
quasars, black holes, and other remote objects that were created during the early formation of our universe.
the strongest background noise emanates from the center of the Milky Way galaxy with a source that is
a mere 27,000 years old. Radio astronomy amateurs measure and publish relevant information as a resource
for other amateurs as well as for professional radio astronomers. As with most technical hobbies these
days, the state of the art in both equipment and methods is very advanced - often in the realm of professionals.
Mr. Doty credits Dr. Darryl Emerson for assistance in the writing of the article, and points readers
to two article written for QST by Dr. Emerson (June and July, 1996). The National Radio Astronomy Observatory
(NARO) website has a page on their website with hyperlinks to a few articles on
astronomy,, including the two in QST from Dr. Emerson.
* QST login required
Posted November 27, 2012