Anyone have measurements of the RSNA-75M radar... I know dimensions of the wheels and tires, size of the trailer it's on... the dimensions of the antennae's ect isn't normally the sort of statistics one asks concerning engagement radars... But I'd like to build a 1:1 facsimile of one in some voxel games...
Hpasp Free SAM Simulator, "Realistic to the Switch" (U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.) http://sites.google.com/site/samsimulator1972/home
The explosion of an SA-2 Surface to Air Missile photographed by a Model 147 drone. The SA-2 had a profound impact on post-war Black aircraft development: it put the U2 overflights at risk, which led to the development of the A-12 Oxcart and D-21 Tagboard. U.S. Air Force
The explosion of an SA-2 Surface to Air Missile photographed by a Model 147 drone. The SA-2 had a profound impact on post-war Black aircraft development: it put the U2 overflights at risk, which led to the development of the A-12 Oxcart and D-21 Tagboard. U.S. Air Force
The explosion of an SA-2 Surface to Air Missile photographed by a Model 147 drone. The SA-2 had a profound impact on post-war Black aircraft development: it put the U2 overflights at risk, which led to the development of the A-12 Oxcart and D-21 Tagboard. U.S. Air Force
[quote=piston79][quote=piston79][b]The explosion of an SA-2 Surface to Air Missile photographed by a Model 147 drone. The SA-2 had a profound impact on post-war Black aircraft Nice, do you have some more?
The explosion of an SA-2 Surface to Air Missile photographed by a Model 147 drone. The SA-2 had a profound impact on post-war Black aircraft development: it put the U2 overflights at risk, which led to the development of the A-12 Oxcart and D-21 Tagboard. U.S. Air Force
your first video contain a very accurate depiction of a modulated noise jamming effects on SA-2, from 20:30, with a nice zoom-in at 20:50.
This is how it's explained in SAM operators training manuals ('statut boevovo primeneniya'):
A noise jamming creates a jamming strobe. But a periodic amplitude modulation to this noise (a sine wave) that is just slightly miss-matched (within 1-3Hz) from a scan frequency of Fan-Song (16Hz), creates the effect of jamming strobe (or its centre of brighteness, more precisely) moving around sideways, as if rotating around some invisible vertical axis on the scope.
This makes it difficult for an operator to keep a steady track on the centre of a jamming strobe and reduces the effectiveness of a manual tracking.
According to my sources, this form of jamming (noise jamming modulated at a scan frequency), especially used from several aircraft flying in a pod formation, was considered the most effective form of jamming against SA-2 by russian SAM engineers.
Sadly, there is no english or russian sub to the videos... there are some other interesting information!
your first video contain a very accurate depiction of a modulated noise jamming effects on SA-2, from 20:30, with a nice zoom-in at 20:50.
This is how it's explained in SAM operators training manuals ('statut boevovo primeneniya'):
A noise jamming creates a jamming strobe. But a periodic amplitude modulation to this noise (a sine wave) that is just slightly miss-matched (within 1-3Hz) from a scan frequency of Fan-Song (16Hz), creates the effect of jamming strobe (or its centre of brighteness, more precisely) moving around sideways, as if rotating around some invisible vertical axis on the scope.
This makes it difficult for an operator to keep a steady track on the centre of a jamming strobe and reduces the effectiveness of a manual tracking.
According to my sources, this form of jamming (noise jamming modulated at a scan frequency), especially used from several aircraft flying in a pod formation, was considered the most effective form of jamming against SA-2 by russian SAM engineers.
Sadly, there is no english or russian sub to the videos... there are some other interesting information!
Indeed! This video is pretty good, I'm glad I found it!
@Jonas85, did you find a way operators could deal with this modulated jamming...?
Dvina that Vietnamese had at that time did not have any technical fixes to counter modulated noise jamming (or other types of jamming) effectively.
For SAM operators, the only instruction was to turn off ARU/VARU and tune RRU knob so that the jamming strobe is as narrow as possible. But this couldn't have helped much against B-52. As Vietnamese had not much help on the hardware fixes from Russians, their only hope was to compensate in tactics - echelon the SAM batteries in such a way that at least one battery will get a good angle where jamming is not so strong. This is how most of B-52's were shot down - they got a firing solution when B-52 bomb bay doors were open (increases RCS) or during a post-target turn.
I can only speculate, but it would be very resonable to guess, that in Volkhov (> mod3, 1972 and later), GShV mode should eliminate or weaken the modulation effect (shooting rules recommend GShV mode on in jamming conditions), as long as jamming does not overload the compensation channel.
Volkhov mod3 and also later mods of Dvina (SA-75MK) had a fix called IARU (Impulse Automatic Gain Control) to counter strong noise jamming (like from B-52). It reduces the receiver gain according to ARU voltage level (which depends to the jamming intensity) on-receive during the time period that corresponds to the range above the horizontal distance marker. Supposedly, this extends the dynamic range by 25dB and rises saturation threshold. IARU effectively narrows the jamming strobe above the horizontal range mark on beta/epsilon indicators, so operators can track in angles more precisely in manual mode, as illustrated below. Range information is fed from RD-75 Amazonka (if available) or from I-87V/TT instrument. IARU mode is not compatible with GShV.