Woodpecker is the name of a Soviet shortwave signal that was heard on radio frequencies all over the world between July 1976 and December 1989. The random frequency changes disturbed public radio and radio amateurs, leading to thousands of complaints worldwide. The signal sounded like a sharp knocking, usually repeated at a frequency of 10 Hz. The power of the signal was estimated at 10 MW EIRP. The transmission took place on alternating frequencies in the shortwave range between 7 and 19 MHz. The similarity with the knock of a woodpecker led to its name. The picture above shows the first facility near Chernobyl, which is now out of service and dismantled.
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Over-the-horizon radar (OTHR), sometimes called beyond the horizon (BTH), is a type of radar system with the ability to detect targets at very long ranges, typically hundreds to thousands of kilometres, beyond the radar horizon, which is the distance limit for ordinary radar. Several OTH radar systems were deployed starting in the 1950s and 1960s as part of early warning radar systems, but these have generally been replaced by airborne early warning systems. OTH radars have recently been making a comeback, as the need for accurate long-range tracking becomes less important with the ending of the Cold War, and less-expensive ground-based radars are once again being considered for roles such as maritime reconnaissance and drug enforcement.
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War in Ukraine began on 24 February 2022
"They interfere with our radio every now and then, which is very annoying, because the frequencies we use are reserved for amateur radio. Today, there are several of them...quite unusual"
""These signals come and go, it's because of the changing propagation conditions. The exact location can be determined for sure, with the appropriate technology.""
""The signal seen in my video clip on the far right, in the 7.133MHz range, I was able to identify later in the evening as "Woodpecker". It is possible that this is the Russian DUGA. I've picked it up before, but what was going on last night was pretty intense."""DUGA-Sound": click here
Over-the-horizon radar is a special type of radar system. It does not operate in the microwave range, i.e. the very high frequencies, but in the low shortwave range.Sourc and fürther info (German)click here
"I received these in the 40m band...due to the propagation conditions I assume that they came from the east. Experienced radio amateurs from my club have confirmed that they are signals from OTHRs."
"Here is the Woodpecker, overlapping with an Italian station and another OTHR."
"For comparison, here is the noise signal of some household appliance in the neighbourhood:"
The following is said to be a signal from the Russian military, which was jammed by the group "Anonymus". The end of the attack is clearly visible and audible.
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