{"id":25315713,"date":"2026-09-28T17:19:11","date_gmt":"2026-09-28T15:19:11","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/russian-woodpecker-duga-radar-cobra-mist-over-the-horizon\/"},"modified":"2026-09-28T17:19:48","modified_gmt":"2026-09-28T15:19:48","slug":"russian-woodpecker-duga-radar-cobra-mist-over-the-horizon","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/it\/russian-woodpecker-duga-radar-cobra-mist-over-the-horizon\/","title":{"rendered":"Russian Woodpecker: The Duga Radar and Cobra Mist Enigma"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n\r\n<p>In the summer of 1976 a sound arrived on the shortwave bands that nobody had asked for. It was a hard, flat tapping, roughly ten beats a second, and it walked. One week it sat on top of an amateur band, the next it was parked across an aeronautical channel used by airliners crossing the Atlantic. Radio operators from Florida to Finland heard the same thing, and the nickname settled within days: the Russian Woodpecker.<\/p>\r\n\r\n<p>What they were hearing was the far end of an enormous machine standing in a pine forest 12 kilometres from a Soviet nuclear power station that nobody outside the USSR had any reason to think about yet. The antenna was a wall of steel lattice the height of a 40-storey building. Its job was to see missiles launch on the other side of the planet, around the curve of the Earth, by bouncing radio energy off the ionosphere.<\/p>\r\n\r\n<p>The West was building the same thing at the same time, on a shingle spit on the Suffolk coast. Both projects were enormous. Both were technically brilliant. Both failed, in completely different ways, and both are still standing.<\/p>\r\n\r\n\r\n<div style=\"background:#f4f6f8;border-left:4px solid #5C91FF;padding:18px 22px;margin:26px 0;font-size:15px;line-height:1.8\"><p style=\"margin:0 0 10px;font-weight:700;font-size:17px;color:#0d1117\">Quick Facts<\/p><p style=\"margin:3px 0\"><strong>Duga (5N32), Chernobyl-2, Ukrainian SSR<\/strong><\/p><p style=\"margin:3px 0\">Role: over-the-horizon backscatter radar for ballistic-missile early warning<\/p><p style=\"margin:3px 0\">Site: receiving array only. The transmitters stood about 60 km away near Liubech<\/p><p style=\"margin:3px 0\">Antennas: two curtains, the low-band one on masts of roughly 135 to 150 m, the high-band one up to about 100 m<\/p><p style=\"margin:3px 0\">Signal: about 10 pulses per second, 7 to 19 MHz in a 1988 FCC study<\/p><p style=\"margin:3px 0\">Heard worldwide: 1976 until 1989<\/p><p style=\"margin:3px 0\">Fate: stopped on 26 April 1986, the day of the Chernobyl accident. Never passed its state acceptance tests<\/p><p style=\"margin:12px 0 3px\"><strong>Cobra Mist (AN\/FPS-95), Orford Ness, Suffolk<\/strong><\/p><p style=\"margin:3px 0\">Role: over-the-horizon radar to watch air and missile activity in the USSR and Eastern Europe<\/p><p style=\"margin:3px 0\">Antenna: 18 log-periodic strings, each about 2,200 ft (670 m), fanned at 7 degrees across a 119-degree sector<\/p><p style=\"margin:3px 0\">Power: 10 MW peak specified, about 3.5 MW ever achieved<\/p><p style=\"margin:3px 0\">Cost: between 100 and 150 million dollars, by the programme's own estimate<\/p><p style=\"margin:3px 0\">Operational: January 1973. Terminated 30 June 1973<\/p><p style=\"margin:3px 0\">Cause of failure: a noise nobody has ever identified<\/p><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">The Signal That Walked Across the Bands<\/h2>\r\n\r\n<p>Over-the-horizon radar works because the ionosphere is a mirror. Ordinary radar is stuck with line of sight, which is why an aircraft low enough is simply below the beam. Our companion piece on the <a href=\"https:\/\/migflug.com\/afterburner\/radar-horizon-why-flying-under-the-radar-is-literal\/\">radar horizon<\/a> explains why that geometry is unforgiving. Bounce a high-frequency signal off the underside of the ionosphere instead and it comes down again a thousand miles away, well beyond the curve. The catch is that you need enormous power, an enormous antenna, and a layer of charged gas whose behaviour changes with the hour, the season and the sun.<\/p>\r\n\r\n<p>Duga chose the brute-force answer. Observers logged its pulse repetition rate at about 10 Hz, with rarer runs at 16 and 20 Hz, pulses built from a 31-bit pseudo-random sequence, and transmissions typically lasting around seven minutes. A 1988 FCC study put its frequency range at 7 to 19 MHz, although operators around the world logged it far more widely than that as it hunted for whichever band the ionosphere happened to be favouring.<\/p>\r\n\r\n<p>That is the whole problem in one sentence. A radar that has to chase the usable frequency will sooner or later park itself on somebody else's.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/aOMVdOc9UbE\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;margin-top:-12px;font-style:italic\">The signal itself, recorded off the air. This is what several million radio operators spent thirteen years trying to filter out.<\/p>\r\n\r\n<p>The nickname has a claimant. In July 1982 the <em>Miami Herald<\/em> ran a piece on radio amateurs fighting the interference, and quoted a Miami Springs operator, Andy Clark, callsign W4IYT, who at the time was running a commercial aeronautical communications station.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;I named that damn thing the woodpecker&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Andy Clark (W4IYT)<\/strong> &mdash; radio amateur and commercial aeronautical radio operator, quoted in the Miami Herald, 7 July 1982<\/div><\/div><\/div>\r\n\r\n\r\n<p>Clark also told the paper the signal was raising hell with the airplanes, and that there were aircraft his station simply could not contact. That is not a trivial complaint about a hobby band. Long-haul aircraft over the ocean depended on HF voice, and a 10 Hz hammer landing on the frequency is not something a crew can talk over.<\/p>\r\n\r\n<p>Receiver manufacturers started shipping noise blankers marketed specifically against it. Amateurs formed the Russian Woodpecker Hunting Club and transmitted synchronised Morse at the same pulse rate, on the theory &mdash; put bluntly by Wayne Green, publisher of the magazine <em>73<\/em>, in the same Herald piece &mdash; that returning a signal on the radar's own frequency would bury its echoes. The Soviet side never publicly admitted the transmitter was theirs.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/duga-1-antenna-masts-chernobyl-exclusion-zone.jpg\" alt=\"Duga radar antenna elements at Chernobyl-2\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The business end of Duga: cage dipoles hung off a lattice frame, repeated down hundreds of metres of curtain. Photo: Alexander Blecher \/ CC BY-SA 4.0<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Chernobyl-2 Was the Ear, Not the Mouth<\/h2>\r\n\r\n<p>Here is the fact that almost every retelling gets wrong. The photogenic wall of steel at Chernobyl-2, the one in every photograph, never transmitted anything. It was the receiving array. The transmitters sat about 60 kilometres away at a separate closed site near Liubech, in the Chernihiv region, which is also abandoned and which nobody photographs.<\/p>\r\n\r\n<p>Chernobyl-2 itself was a garrison of roughly 1,500 people, and on Soviet maps it was labelled as a children's summer camp. The two receiving curtains are usually quoted as a single structure 150 m high and 700 m long. In fact there are two: a low-band array on masts of about 135 to 150 m and some 300 to 500 m long, and a shorter high-band array roughly 250 m long and up to about 100 m high. Stand in front of them and the 700 m figure makes sense as the combined frontage, which is probably where it came from.<\/p>\r\n\r\n<p>The Soviet designation was 5N32, part of a system the Russian sources call Duga, meaning arc. Western intelligence knew it as Steel Yard, also rendered Steel Work or Steel Works depending on which handbook you read. The name Duga-3, which appears everywhere in amateur-radio literature and on YouTube, does not appear in the Russian-language material at all: the Chernobyl node was radar node No. 1, Duga-1, and the second was at Komsomolsk-on-Amur.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">It Never Passed Its State Tests<\/h2>\r\n\r\n<p>For all the noise it made, Duga did not do the job it was built for. The physics defeated it. Detecting a missile launch by the disturbance its exhaust plume makes in the ionosphere requires you to model the ionosphere, and in the 1970s nobody could.<\/p>\r\n\r\n<p>The admissions are on the record in Russian accounts of the programme. A May 1982 resolution of the CPSU Central Committee and Council of Ministers acknowledged that the effort had solved a string of hard problems &mdash; unique antennas, powerful transmitters, sensitive receivers, large computing systems &mdash; and then stated the outcome plainly.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #d32f2f;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;it was not possible to achieve the specified tactical and technical characteristics&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>CPSU Central Committee and Council of Ministers<\/strong> &mdash; resolution of May 1982, as recorded in Russian accounts of the 5N32 programme<\/div><\/div><\/div>\r\n\r\n\r\n<p>The same material is specific about why. The behaviour of the stations depended on the state of the propagation path and on processes in the ionosphere which had not been sufficiently studied, making it impossible to calculate the real attenuation of the signals or to build a reliable detection model &mdash; with the worst limitations on the polar paths, which is exactly where an American missile would come from.<\/p>\r\n\r\n<p>The numbers tell the same story. Early tests of the experimental array near Nikolaev suggested the probability of detecting a single missile launch from US territory would be very low. The Komsomolsk node went on trial duty in 1981 with what the accounts describe as a large number of false alarms, and was accepted for combat duty on 30 June 1982 only for mass and group launch detection, not single launches. After modernisation, single-launch detection probability at 6,000 km is given as improving from 0.5 to 0.7 up to 0.9 to 0.92 &mdash; an improvement, but one that arrived years late and only at the eastern node.<\/p>\r\n\r\n<p>The institutional verdict was blunter. The director of the responsible institute, V. I. Markov, is recorded as concluding that nothing more could be squeezed out of the two stations and that developing them further was useless work. The chief designer of the original experimental system, Franz Alexandrovich Kuzminsky, had already been removed as institute director by ministerial order in August 1981.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/uwgOdr9KFOM\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;margin-top:-12px;font-style:italic\">Megaprojects walks through the Duga programme, the site and the interference it caused.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">The Chernobyl Theory, and Why It Is Backwards<\/h2>\r\n\r\n<p>Because the array stands 12 km from the ruined reactor, a theory has grown up that the explosion of 26 April 1986 was arranged to bury the radar's failure. It is the thesis of the 2015 documentary <em>The Russian Woodpecker<\/em>, in which the Ukrainian artist Fedor Alexandrovich argues that a senior Soviet communications official ordered the plant destroyed. It is a genuinely gripping film. It is not a sourced account.<\/p>\r\n\r\n<p>The mundane version fits the evidence better, and it runs the other way. The Chernobyl node had already failed. It had not passed its state tests after the 1985 to 1986 modernisation, and it was due to be presented for state testing again in November 1986. The accident cancelled that. Duga-1 stopped on 26 April 1986 and by the end of that year almost all of its new equipment had been shipped east to Komsomolsk. The disaster did not cover for the radar. It killed it.<\/p>\r\n\r\n<p>Two smaller claims attached to the theory also deserve a flag. The often-repeated figure that Duga cost twice as much as the power station, and the round seven-billion-dollar number, have no documentary basis we could find; even outlets that repeat them label them as speculation. And the story that Phil Donahue, shown the array on the horizon after the disaster, was told it was an unfinished hotel is repeated as legend by the outlets that carry it, not as reporting.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Britain Got the Other One, Because Turkey Said No<\/h2>\r\n\r\n<p>While Duga was going up, the US Air Force was building its own over-the-horizon radar to look the other way, into the Soviet Union and Eastern Europe. It very nearly went to Turkey. The declassified programme history is unusually candid about it: the radar was to be located in Turkey, a hiatus developed when the site was not made available, and after a search and some negotiation the British offered a site in Suffolk near the town of Orford.<\/p>\r\n\r\n<p>That is how the largest radar the United States ever built in Britain came to sit on a shingle spit best known for secret weapons trials. The contract went to RCA at the end of 1966, construction started in mid-1967, and the design leaned heavily on the Naval Research Laboratory's earlier Madre radar on Chesapeake Bay. In the United Kingdom the mere fact that the installation was a radar was classified Secret.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/former-cobra-mist-operations-building-orford-ness.jpg\" alt=\"The former Cobra Mist operations building at Orford Ness, Suffolk\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The Cobra Mist operations building still stands on Orford Ness. The masts behind it belong to a later tenant, the BBC World Service transmitting station. Photo: Peter Facey \/ CC BY-SA 2.0<\/figcaption><\/figure>\r\n\r\n\r\n<p>The antenna was a fan. Eighteen log-periodic strings radiated from a central hub like spokes, each about 2,200 ft long, separated by 7 degrees and so occupying a 119-degree sector, all of it sitting over a wire-mesh ground screen. The original procurement specification had called for 1,800 ft strings at the same spacing; UK heritage records give 2,040 ft; the programme's own account says 2,200 ft as built. Of 119 degrees of physical array, the radar actually used 91 degrees of azimuth coverage, from 19.5 to 110.5 degrees clockwise from true north, in thirteen beam positions.<\/p>\r\n\r\n<p>It was also less powerful than the legend. The design called for 10 MW peak and 600 kW average. In practice about 3.5 MW peak was achieved. The 10 MW figure that circulates is the specification, not the machine.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">The Noise<\/h2>\r\n\r\n<p>Cobra Mist went operational in January 1973, six months behind its target date, and was shut down on 30 June 1973. Five months. In between, a Scientific Assessment Committee ran experiments from January to May and reported in May. Then the programme was terminated abruptly, the equipment was dismantled and removed, and hundreds of people and somewhere between 100 and 150 million dollars went home.<\/p>\r\n\r\n<p>The reason was a noise. Not interference in the ordinary sense, and not a fault anyone could find. The radar needed to see aircraft returns buried under ground clutter, which means it needed what the trade calls subclutter visibility: the design goal was 80 to 90 dB, itself well beyond the roughly 60 dB achieved by anything before it. What it got was 60 to 70 dB, because a noise with an almost flat Doppler spectrum sat in every range bin that contained ground clutter &mdash; which is to say, in every range bin that mattered.<\/p>\r\n\r\n<p>The declassified account of the investigation, written up by four MITRE engineers in 1979 and declassified in 1993, is one of the more remarkable engineering documents of the Cold War. It opens with an epigraph from <em>The Tempest<\/em>. Its abstract ends like this.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #1565c0;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;Experiments performed at the site failed to uncover the source of the noise, either in the equipment or in the propagation medium. Other experimental results imply that the noise was associated with returns from land areas and not from sea surfaces; the possibility of electronic countermeasures was not ruled out. Because the source of the noise was not located and corrected, the radar program was terminated in June 1973 and the equipment removed from the site. The cause of the noise is unknown to this day.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Ernest N. Fowle, E. L. Key, R. I. Millar and R. H. Sear<\/strong> &mdash; The Enigma of the AN\/FPS-95 OTH Radar, MITRE Corporation, 1979, declassified 1993<\/div><\/div><\/div>\r\n\r\n\r\n<p>What makes the report worth reading is the elimination. The equipment was tested exhaustively and exonerated: RCA's hardware was judged of high quality and almost certainly not the source. The ionosphere was ruled out by a Land\/Sea experiment comparing adjacent beams pointed over the Black Sea against beams pointed over land, whose results imply the cause was not in the transmission medium; an independent Naval Research Laboratory analysis agreed that the ionosphere could not contaminate a spectrum to the level seen. Auroral modulation was tested and rejected, because the noise turned up on northerly beams whether or not there was an aurora. A separate NRL report advanced meteor echoes. And the noise was not an isolated phenomenon: it appeared at all times of day, in all seasons, in all beams, at all frequencies, in both polarisations.<\/p>\r\n\r\n<p>Which leaves the possibility the report declines to dismiss. The radar existed to watch the Soviet bloc, a function the authors note could have been deeply resented, and they set out the case for a jamming technique not easily recognised as jamming, noting a precedent for it. Their conclusion is careful and, read fifty years later, slightly chilling: the technique is quite feasible, it is not clear that the experiments conducted would have discovered it, and the experiments that would have confirmed or denied the possibility were not conducted.<\/p>\r\n\r\n<p>There is one more line in that report that reframes the whole story. During the 1973 tests, members of the assessment committee visited another over-the-horizon radar site and brought back records that clearly showed the same kind of clutter-related noise. Whatever it was, Orford Ness was not the only place it lived &mdash; which raises the possibility the authors themselves float, that natural effects of some kind simply cap subclutter visibility in HF over-the-horizon radar at around 60 to 70 dB.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/orford-ness-lantern-marshes-cobra-mist-site-view.jpg\" alt=\"View across the shingle of Orford Ness towards the Cobra Mist site\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Lantern Marshes, Orford Ness. The antenna fan and its ground screen once covered this shingle. Photo: Christopher Hilton \/ CC BY-SA 2.0<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Duga and Cobra Mist, Side by Side<\/h2>\r\n\r\n\r\n<div style=\"overflow-x:auto;margin:22px 0\"><table style=\"width:100%;border-collapse:collapse;font-size:14px\"><thead><tr><th style=\"background:#5C91FF;color:#fff;padding:9px 10px;font-weight:600;text-align:left\">&nbsp;<\/th><th style=\"background:#5C91FF;color:#fff;padding:9px 10px;font-weight:600;text-align:left\">Duga (5N32), Chernobyl-2<\/th><th style=\"background:#5C91FF;color:#fff;padding:9px 10px;font-weight:600;text-align:left\">Cobra Mist (AN\/FPS-95), Orford Ness<\/th><\/tr><\/thead><tbody><tr><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\"><strong>Operator<\/strong><\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">Soviet air defence forces<\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">US Air Force, on a British site<\/td><\/tr><tr style=\"background:#f7f9ff\"><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\"><strong>Looking for<\/strong><\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">Missile launches from US territory<\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">Aircraft and missile activity in the USSR and Eastern Europe<\/td><\/tr><tr><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\"><strong>Built<\/strong><\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">From 1972, first switch-on given as 1980<\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">Contract late 1966, construction from mid-1967<\/td><\/tr><tr style=\"background:#f7f9ff\"><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\"><strong>Antenna<\/strong><\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">Two curtains, masts to about 150 m<\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">18 strings of about 2,200 ft in a 119-degree fan<\/td><\/tr><tr><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\"><strong>Frequency<\/strong><\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">7 to 19 MHz per a 1988 FCC study<\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">6 to 40 MHz<\/td><\/tr><tr style=\"background:#f7f9ff\"><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\"><strong>Peak power<\/strong><\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">Western estimates range from 2 to 40 MW. No reliable figure<\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">10 MW specified, about 3.5 MW achieved<\/td><\/tr><tr><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\"><strong>Working life<\/strong><\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">Signal audible worldwide 1976 to 1989. Node stopped April 1986<\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">Operational January 1973 to 30 June 1973<\/td><\/tr><tr style=\"background:#f7f9ff\"><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\"><strong>Why it ended<\/strong><\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">Failed its state acceptance tests. The reactor accident finished the site<\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">An unexplained noise that capped its detection performance<\/td><\/tr><tr><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\"><strong>Still there?<\/strong><\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">Yes, inside the Chernobyl Exclusion Zone, stripped of equipment<\/td><td style=\"padding:9px 10px;border-bottom:1px solid #eee;text-align:left\">Building yes, antenna no. The site is a National Trust nature reserve<\/td><\/tr><\/tbody><\/table><p style=\"font-size:12px;color:#666;margin:10px 0 0\">Figures as sourced in the text. Where sources disagree the range is given rather than a single number.<\/p><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Two Ruins<\/h2>\r\n\r\n<p>Duga-1 is the only one of the three Soviet arrays still standing, and it stands inside the Chernobyl Exclusion Zone, listed by Ukraine as a monument of national significance. Guided visits were allowed from 2013. Access passes were suspended in April 2022 for the duration of martial law and the zone has remained closed to tourists since. Russian forces held the area for about six weeks in early 2022. Much of the radar's technology had already been stripped out long before that.<\/p>\r\n\r\n<p>Orford Ness went the other way. The Cobra Mist antenna came down, the building was handed on to the BBC World Service as the Orfordness transmitting station, and the spit is now a National Trust nature reserve where visitors walk past the concrete pagodas of the old weapons-testing establishment. The building is still there, grey and windowless, on a shingle bank in Suffolk.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/Ct_vHBbp9d0\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;margin-top:-12px;font-style:italic\">A walk around Orford Ness and what is left of the Cobra Mist installation.<\/p>\r\n\r\n<p>The tidy moral would be that over-the-horizon radar was a dead end. It was not: modern systems like Australia's Jindalee network work, and work well, on a far better understanding of the ionosphere and vastly more processing. What both of these machines ran into was the gap between building something enormous and understanding the medium it had to work through. The Soviets could not model the ionosphere well enough to trust a launch warning. The Americans could not find the noise.<\/p>\r\n\r\n<p>One of those problems got solved. The other one, fifty-three years later, is still sitting in a declassified report with no answer at the bottom of it.<\/p>\r\n\r\n<p><em>Sources: Fowle, Key, Millar and Sear, The Enigma of the AN\/FPS-95 OTH Radar, MITRE Corporation 1979, declassified 1993; Utley, Headrick, Rohlfs and Hoffmeyer, NRL Report 7655, December 1973; Hugh Griffiths, The History Column: COBRA MIST, IEEE Aerospace and Electronic Systems Magazine; GlobalSecurity.org 5N32 Duga Steel Yard, translating Pervov and Karpenko; Miami Herald, 7 July 1982; Suffolk Historic Environment Record monument ORF 177; National Trust, History of Orford Ness; ARRL; FCC study of 1988 as reported.<\/em><\/p>\r\n\r\n\r\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\r\n\r\n\r\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What was the Russian Woodpecker signal?<\/summary><div class=\"a\">The Russian Woodpecker was the nickname radio operators gave to a Soviet over-the-horizon radar signal first heard worldwide in 1976. It transmitted short pulses at about ten per second, which sounded like sharp tapping on shortwave receivers, and it moved across the high-frequency bands as ionospheric conditions changed.<\/div><\/details><details><summary>Where was the Duga radar located?<\/summary><div class=\"a\">The famous Duga antenna array stands at Chernobyl-2, about 12 km from the Chernobyl nuclear power station in Ukraine. It was only the receiving array. The transmitters stood at a separate closed site about 60 km away near Liubech, in the Chernihiv region.<\/div><\/details><details><summary>How tall is the Duga radar at Chernobyl?<\/summary><div class=\"a\">There are two antenna curtains, not one. The low-band array sits on masts of roughly 135 to 150 metres and runs some 300 to 500 metres long. The shorter high-band array is about 250 metres long and up to about 100 metres high. The commonly quoted 150 by 700 metres is best read as the combined frontage.<\/div><\/details><details><summary>Did the Duga radar cause the Chernobyl disaster?<\/summary><div class=\"a\">No. The claim comes from the 2015 documentary The Russian Woodpecker and has no documentary support. The causation runs the other way: the Chernobyl node had already failed its state acceptance tests, it stopped on 26 April 1986 when the reactor exploded, its planned November 1986 state testing was cancelled, and its equipment was shipped east.<\/div><\/details><details><summary>What was Cobra Mist?<\/summary><div class=\"a\">Cobra Mist, designated AN\/FPS-95, was a US Air Force over-the-horizon radar built on Orford Ness in Suffolk, England, to watch air and missile activity in the Soviet Union and Eastern Europe. It had eighteen log-periodic antenna strings of about 2,200 feet each, fanned across a 119-degree sector, and cost between 100 and 150 million dollars.<\/div><\/details><details><summary>Why was Cobra Mist shut down?<\/summary><div class=\"a\">A noise with an almost flat Doppler spectrum appeared in every range bin containing ground clutter, holding the radar to 60 to 70 dB of subclutter visibility against a design goal of 80 to 90 dB. Investigators exonerated the equipment and ruled out the ionosphere, never found the source, and the programme was terminated on 30 June 1973.<\/div><\/details><details><summary>Was the Cobra Mist noise ever explained?<\/summary><div class=\"a\">No. The declassified MITRE report on the investigation states that the cause of the noise is unknown to this day. Meteor echoes were proposed, auroral modulation was tested and rejected, and the report explicitly declines to rule out a covert Soviet jamming technique, noting that the experiments which would have settled that were never conducted.<\/div><\/details><details><summary>Can you visit the Duga radar or Orford Ness today?<\/summary><div class=\"a\">Orford Ness is a National Trust nature reserve in Suffolk and is open to visitors, with the Cobra Mist building still standing. The Duga array at Chernobyl-2 is inside the Chernobyl Exclusion Zone; guided access was permitted from 2013 but zone access passes were suspended in April 2022 under martial law.<\/div><\/details><\/div><\/section>\r\n\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What was the Russian Woodpecker signal?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Russian Woodpecker was the nickname radio operators gave to a Soviet over-the-horizon radar signal first heard worldwide in 1976. 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The Duga array at Chernobyl-2 is inside the Chernobyl Exclusion Zone; guided access was permitted from 2013 but zone access passes were suspended in April 2022 under martial law.\"}}]}<\/script><div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/radar-horizon-why-flying-under-the-radar-is-literal\/\">Radar Horizon: Why Flying Under the Radar Is Literal<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/nimrod-aew3-british-radar-failure-1986-cancellation\/\">The Billion-Pound Radar That Never Worked<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/dew-line-distant-early-warning-arctic-radar-history\/\">The DEW Line: A Radar Fence Across the Top of the World<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/chain-home-dowding-system-battle-of-britain-radar\/\">The Radar Net That Won the Battle of Britain<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>A Soviet radar tapped across the shortwave bands for thirteen years and never passed its state tests. The American one in Suffolk died of a noise nobody has ever explained.<\/p>","protected":false},"author":27,"featured_media":25314521,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665,664],"tags":[],"class_list":["post-25315713","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world","category-military-aviation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Russian Woodpecker: Duga Radar and Cobra Mist | MiGFlug<\/title>\n<meta name=\"description\" content=\"The Russian Woodpecker signal came from Duga, a Soviet radar that never passed its state tests. 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