Tour the Russian 'Woodpecker' (DUGA): Featured in CNN Travel News

Discussion in 'Amateur Radio News' started by W1YW, Mar 3, 2019.

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  1. K6CLS

    K6CLS Ham Member QRZ Page

    Chip, terrorism (freedom fighters, revolutionaries) is asymmetric warfare; MAD is symmetric. Duga was built in the MAD era, cold war.
  2. NI9Y

    NI9Y Ham Member QRZ Page

    I have the Wood Pecker in my log.
    K5HFG and K4KP like this.
  3. W1YW

    W1YW Ham Member QRZ Page

    Exactly. But the second function was asymmetric: offensive, quick, and unexpected.
  4. W1YW

    W1YW Ham Member QRZ Page

    A CRUDE estimate of the antenna gain...

    8 x 15 array = 120 elements. (I may have counted wrong, please correct).

    Each element has roughly 6 dBi (with GP)

    ROUGH gain = 6dBi + (about) 21 dB = 27 dBi.

    ERP estimate, attack mode (no losses)....

    log P(Chernobyl)+ 27 + 13 (focussing) dBW

    If P(Chernobyl) is 4 GW....

    ERP (rough) = 96dBW +40 = 136 dBW

    This is too high; probably lose 6+ dB for cabling limitations .

    Call it roughly 130 dBW (max).

    With losses, 120 dBW is conservative....

    That's a terawatt+. At HF.

    Arecibo is about 2 terawatts at 430MHz, for comparison.

    Take into account prop /path losses(Friis, not radar way), but add large number of delivered impulses for irradiated damage. IOW add another 20 dB after subtracting the prop losses, to get the delivered power to target.

    Your calc...

    Chip W1YW

    Last edited: Mar 4, 2019
  5. W1YW

    W1YW Ham Member QRZ Page

    I get well over a KW irradiated **at target**....

    If my 120 dBW is too conservative, (try 123 dBW) that can easily be a megawatt at target.

    Nasty stuff.
  6. K9CTB

    K9CTB XML Subscriber QRZ Page

    Notwithstanding the soviets (both old and re-branded) hate us, Duga was a great first attempt at OTH detection and tracking. Unfortunately for the soviets, it was not very good at targeting incoming aircraft, so from the bang-per-buck perspective, it was a bad deal .... so it's now defunct. As P/Od at us as they are now, I wouldn't be surprised if they resurrected some sort of new OTH copy of US technology ... after all, the Chicoms certainly are!
  7. W1YW

    W1YW Ham Member QRZ Page

    Hmmm...typo. Not megawatt. 130 dBw gets you over 10KW at target.

    Not easy to shield, on surface, 10KW at HF....

    It is interesting that the frequencies chosen produce resonances on rocket-long platforms.
  8. K9NR

    K9NR XML Subscriber QRZ Page

    Pretty typical CNN "report" full of gross technical errors and inaccuracies. When "reporting" technological stories, the pop news media seems to lack any credible experts and often produces claptrap worthy of a supermarket tabloid. Fortunately for CNN, there is no shortage of cretins who love to wallow pseudo-science and conspiracy theories
    Last edited: Mar 4, 2019
    W2JEL likes this.
  9. K5HFG

    K5HFG Ham Member QRZ Page

    I remember many cw QSO's obliterated by this peckerwood back in the 70's. Glad it is dead.
  10. W4MHZ

    W4MHZ Ham Member QRZ Page

    I estimate the one array to be 18 x 18 dipoles.
    18 x 18 = 324 dipoles.
    Gain of the array is going to be about 27 dBd So 1 kw in is going to look like about 350kw EIRP
    10 kw in is going to look like about 3.5 megawatts EIRP and so forth; 100 kw in 35 megawatts EIRP
    That is for ONE of the arrays. I believe there were 4 arrays?
    N4JTH likes this.
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