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Last Updated: Mon Jan 27 11:18:09 UTC 2014

SNR-75M3 Fan Song E Engagement Radar

  Станция Наведения Ракет СНР-75 Fan Song E

Technical Report APA-TR-2009-0702-A

Text by Dr Carlo Kopp, AFAIAA, SMIEEE, PEng
Images by
Miroslav Gyűrösi
July 2009
Updated April, 2012
Images © 2000, 2009 Miroslav Gyűrösi
Text, Line Art © 2009 - 2012 Carlo Kopp


The SNR-75M3 Fan Song E is the last volume production variant of the S-75 Volkhov / SA-2 Guideline engagement radar. The exterior images were produced in 2000 by
Miroslav Gyűrösi, at the Timisoara 2000 Air Show in Romania, and the interior images in 2009 at the Zsambek Museum in Hungary. They provide a close view of all of the key components of the radar system, including most radar vans and some supporting equipment.

SNR-75M3 Fan Song E Engagement Radar

Technical Analysis of RSNA-75/SNR-75 Fan Song Engagement Radar

The SNR-75 Fan Song family of radars was employed to provide target fine tracking and command link guidance for the S-75 / SA-2 Guideline SAM. The radar system is packaged in four vans, designated the:
  1. PV Cabin - radar head, transmitter and RF stages.
  2. UV Cabin - consoles / stations for commander, guidance officer and operators.
  3. AV Cabin - radar IF stages, MTI hardware, target and missile analogue tracking computers, uplink command generator, uplink transmitter.
  4. RV Cabin - diesel power generators and mains grid motor/generator power converter/conditioner.
Additional vans house engineering equipment to support the system, and often auxiliary generators were provided.

Not depicted is the RV van which is the central power supply for the missile battery, providing three phase 400 Hz utility electrical power. The RV van contains:
  1. Three 100 KW EZD-100 diesel electric 220V/400 Hz generators, each built around a tank engine.
  2. VPL-50 mains grid power converter/conditioners, each comprising a triple phase 380V/50Hz motor driving a triple phase 220V/400Hz alternator.
This arrangement permitted missile battery operation without external power, or operation using the local power grid, regardless of the quality of the local electrical grid.

All of these vans were towed, typically by a general purpose 6 x 6 ZiL or UrAL truck, although the tracked AT-S artillery tractor was often used in the Middle East in soft desert terrain.

The missile command post and guidance crew comprised:
  1. Fire Control Officer responsible for tactical assessments and launch decisions.
  2. Guidance Officer (Lt, Capt or Major) responsible for guiding the missiles during engagements.
  3. Three System Operators (NCOs) responsible for elevation and azimuth acquisition and tracking of the target and measuring range to target.

PV Cabin / Radar Head

PV van with antenna head elevated at ~15° and rotated on the base turntable.

Aft view of PV van with antenna head levelled.

P-11 “Metal Air Lens” trough antenna for elevation scan, and TV telescope for optical angle tracking under jamming conditions.

P-13 elevation channel pencil beam antenna and feed.

P-14 azimuth channel pencil beam antenna and feed.

P-15/RPK circularly polarised missile uplink antenna.

UV Cabin / Operator Stations

UV and AV vans - these contain the operator stations and system electronics respectively.

UV van.

UV van.

UV van.

UV van Guidance Officer station.

UV van operator stations.

UV van rangefinding station.

UV van elevation tracking station.

UV van azimuth tracking station.

RD-75 Amazonka Rangefinding Radar

The RD-75 Amazonka was a rangefinding radar incorporated often in late model S-75 / SA-2 Guideline missile batteries. It was slaved in azimuth and elevation to the boresight of the SNR-75M3 Fan Song and was employed to perform precision rangefinding when the rangefinding channel in the Fan Song was degraded or compromised by jamming.

RD-75 deployed configuration.

RD-75 parabolic section antenna and feeds.

RD-75 feed horns. The large horn is for the primary channel, the smaller horn in front of the reflecting planar screen is for a receive channel. Note the polarisation sensitive reflector used to improve jam resistance.

RD-75 waveguide to feed, and antenna drives.

Technical Report APA-TR-2009-0702-A

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