# 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. ### K6CLSHam MemberQRZ Page

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

2. ### NI9YHam MemberQRZ Page

I have the Wood Pecker in my log.

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3. ### W1YWHam MemberQRZ Page

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

4. ### W1YWHam MemberQRZ 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 equation...one 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.

73
Chip W1YW

Last edited: Mar 4, 2019
5. ### W1YWHam MemberQRZ 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. ### K9CTBHam MemberQRZ 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. ### W1YWHam MemberQRZ 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. ### K9NRXML SubscriberQRZ 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
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9. ### K5HFGHam MemberQRZ Page

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

10. ### W4MHZHam MemberQRZ Page

Well lets see. BACK OF ENVELOPE APPROXIMATION
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?

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