In late September, University of Alaska-Fairbanks researcher Chris Fallen, KL3WX, was attempting to produce an RF-induced airglow — or artificial aurora — using the High Frequency Active Auroral Research Program (HAARP) facility near Gakona, Alaska, to warm up the atmosphere. Clouds hampered his experiment, but Fallen alerted his Twitter followers that he also had embedded a few Slow-Scan Television (SSTV) frames in the powerful HAARP signal, which were copied in British Columbia and in Colorado.
“The SSTV images, aside from being a fun way to engage hams in some of the ionosphere-heating science performed at HAARP, will be useful for understanding radio propagation from Arctic or high-latitude sources,” Fallen told ARRL.
HAARP consists of multiple transmitters feeding 180 phased-arrays and is capable of producing 3.6 MW (that’s megawatts) of RF. HAARP’s signal is essentially aimed straight up.
The assistant professor at the UAF’s Geophysical Institute transmitted two UAF logos, a photo of his cat — appearing as a giant feline next to the HAARP antenna field, and — most unusual — a QR code granting the recipient 0.001 Bitcoin. The SSTV images were not the best, and you almost need to use your imagination to make out the cat.
The first SSTV reception report arrived from Walt Salmaniw in Victoria, British Columbia, using a Perseus SDR, MixW software, and a north-directed corner fed loop. The second SSTV report arrived from Michael Coletta, KM0MMM, Pueblo, Colorado.
His transmissions were on three discrete frequencies in the 2.8 MHz range. Fallen used different frequencies and antenna phase settings to determine if those factors would affect the airglow.
“I used Scottie-1 encoding for the images, because it is widely used in North America and the ~120-second duration fit nicely into the airglow experiment,” Fallen said. “The antenna was directed toward the HAARP magnetic zenith, which, at ~75° elevation, is nearly vertical but has often been found by previous scientists to maximize artificial airglow. One factor affecting both the airglow experiment and the reception is that local foF2 had dropped below the transmission frequency of approximately 2.8 MHz at the time of the experiment.” He believes the British Columbia and Colorado reports came from the side lobes of HAARP’s primary beam.
Fallen told ARRL he still has some HAARP time left from his September campaign, although he’s not certain what he’ll use it for. His next opportunity to experiment further won’t be until early next spring. HAARP conducts just two experimental campaigns a year, due to staff and funding constraints.
The second public test of FT8 DXpedition Mode has shown that the mock DXpedition stations (“Foxes”) were able to work the pileups of callers (“Hounds”... Read more
MixW 4 is a new multi-mode, multi-platform software for radio amateurs. A completely new outlook. Tons of new features. JT65 and FT8 modes. Kiw... Read more
The second public test of FT8 DXpedition Mode will take place on April 7, and all radio amateurs are invited to participate. WSJT-X Developer Joe Tayl... Read more
“This will be the 4th or 5th video I have done on or about an RFinder device. This Android DMR and phone device has been my daily carry for abou... Read more
Here is a video on my latest device which I use daily. The RFinder K1 UHF DMR Smartphone. A completely new design, new motherboard, great look and fee... Read more
“Microphones” is the topic for the latest (April 12) episode of the “ARRL The Doctor is In” podcast. Listen…and learn! Sponsored by DX Enginee... Read more
Radio Amateurs in Canada are poised to join those in several other nations around the world who have access to a new 60-meter band, 5351.5 – 5366.5 kH... Read more
Wednesday, April 18, is World Amateur Radio Day (WARD), this year marking the 93rd anniversary of the International Amateur Radio Union (IARU), founde... Read more
The ARISS-Russia Cosmonautics Day (International Day of Human Space Flight) SSTV transmissions from the International Space Station have proven popula... Read more