Iran has the capacity to build a surface to air missile with "capabilities like Russian S-300" in some specific parts.
Iran has a long history of working of Solid fuel surface to surface rocket. Mainly Naze'at and Zelzal series.
Naze'at - Wikipedia, the free encyclopedia
Modlex product: MXF05-000330 Nazeat 6-H Surface to Surface Rocket
Modlex product: MXF05-000340 Nazeat 10-H Surface to Surface
Modlex product: MXF05-000360 Zelzal 3 Surface to Surface Rocket
Modlex product: MXF05-000370 Zelzal 3-B Surface to Surface Rocket
Older generations of Fateh-110 available for export:
Modlex product: MXF05-000350 Fateh-110 Surface to Surface Missile
These rocket's engines are not powerful enough to be used as Bavar 373's engine directly. For example, Naze'at 10 H which is close to S-300 missiles in dimensions, only has a range of 130km with a 230kg warhead. A SAM based on it's engine would have a range of only 52km.
Iran can modify the engine like what it did with Zelzal 3s engine. Newest generation Fateh 110 which uses the modified Zelzal 3 engine has a range of 300km compared to Zalzal's 200km. It also has movable fins which cause a lot of drag. The warhead size is reduced by 250 kg. 650kg from Zalzal 3's 900kg.
If Iran uses those upgrades for the Naze'at 10 based SAM and reduce it's warhead size to 130kg(Which is roughly the same as S-300's missile warheads) it would probably have a range of about 75-80km. Again less than Newest S-300PMU variants which have a range of more than 200km.
But Iran can use newer Fateh-110's engine directly. With a great decrease of warhead weight (From 650 to 150) and a completely new missile body design, It can achieve a range of 150-180km. Near S-300PMU's 200km. But with a much larger missile (more than 30% larger).
Radars are another problem. Iran is working on a Phased Array radar for Mowj-2 frigate. Also pictures of an unspecified Phased Array radar are seen during an exhibition.
Also, HAWK's old radar seeker (which uses dish antenna) is changed with a new modern looking one.
http://i39.tinypic.com/2hyxzeu.jpg
http://upload.wikimedia.org/wikipedia/commons/0/02/MIM-23_radar_seeker_DSCN4273.JPG
Seems that Iran has been developing such radars since 2007. I found this janes article about it:
Iran develops phased array radar - Jane's Defence Weekly
And they specified that the development of a Phased Array radar with 6400 elements is done about a year ago. This number matches the number of elements seen on the radar in the exhibition.
I wrote an article about Iran's capability in making a long-range air-defense system similar to S-300 in action in another website. Unfortunately it is written in Persian and I can't translate it because of my poor knowledge of English which may cause major misunderstandings.So, Google translate may help you better than me.
Military.ir, The First Military Reference Site In Iran |