The Arecibo Radio Telescope, at Arecibo, Puerto Rico. At 1000 feet (305 m) across, it is the second largest dish antenna in the world. (Source: Wikipedia)
Many thanks to SWLing Post contributor, Ivan Cholakov, who writes:
Thomas, I did not see a story on the blog about the HF atmospheric heating experiments conducted by the Arecibo observatory a couple of weeks ago.
Thomas Cholakov N1SPY made a video about it but I am also sure a bunch of other listeners were able to tune to the super-strong signal on 5125 and 5095 kHz.
Great video, Thomas!
Indeed, I did miss posting this item. The event timing conflicted with my travel schedule in a bad way. Sadly, I only had one opportunity to tune in and I did too late (by just a couple of minutes!) that day.
Did anyone else catch the on-air experiments from Arecibo?
2018 Tests looks like they have started, getting a great signal on 5095Khz 11/3/18 at 0527Z
here my experience from Italy
http://i56578-swl.blogspot.it/2017/07/arecibo-ionosphere-hf-campaign-24-31.html
I heard it a few times here in SW Alabama, but missed getting the SSTV because the modulation level was way too low. Hopefully they’ll choose to do another set of tests in the future so we can listen in again!
A twitter search for my handle @ctfallen will turn up a lot of links to receptions of the HF ionosphere modification transmissions from Arecibo during their July campaign. The campaign ended with an SSTV broadcast that was copied quite well at least in northern Texas and in Pennsylvania. Stay tuned for the HAARP campaign during the September 2017 new moon and if you are in Alaska next week drop by the HAARP open house on August 19!
HF tests from Arecibo observatory – 5125 kHz, july 31, 2017.
It was so strong in the night also in Italy, on 5125 KHz.
Nothing receivable on 8175 KHz.
As for Klaus, the SSTV finale was not received because the signal started to fade out, here was morning.
An interesting sweep test can be found on my YouTube channel: https://youtu.be/TQpWksAqdrM
73 to all.
Thank you Ivan for the great explanation.
Indeed, the Signals from Arecibo were listenable here in Germany.
All during the night on 5125 kHz, ond 5095kHz. Nothing could be heard on 8175kHz.
Unfortunately, on the last day 15min before the SSTV transmission starts , the signal going down and was to weak to decode.
Here a short Video from July 24 at 22.55 UTC
https://www.youtube.com/watch?v=srq8i7zbXZY
Cheers and 73 de DD2DR
Klaus