PLA OTH surface wave radar network for the Taiwan strait

PLA OTH-SW radar network site locations

Site 1: (from top down)
TX site: Wenzhou, Zhejiang, 2 transmitters, 2x Log Periodic Antenna Arrays (LPAA).
RX site: 1x Monopole antenna array.

Site 2:
TX site: Fuzhou, Fujian, 2 transmitters, 2x Log Periodic Antennas (LPA, single antenna).
              This is the only transmitter antenna configuration in the radar network, only one LPA
              is used per one transmitter.
RX site: 1x Monopole antenna array.

Site 3:
TX site: Zhangpu, Fujian, 2 transmitters, 2x Log Periodic Antenna Arrays (LPAA).
RX site: 1x Monopole antenna array.

Site 4:
TX site: Guangdong, 2 transmitters, 2x Log Periodic Antenna Arrays (LPAA).
RX site: 1x Monopole antenna array.
Construction took place in 2014 to relocate the Control and RX sites that are close to a nearby developing industrial park.

PLA OTH-SW radar network and its 300 km coverage

The radar detection range shown below is based on Russian Podsolnukh–E OTH-SW radar specifications (300 km for Aircraft carrier type surface targets).



Transmitter beaming direction is determined by measuring TX LPAA pointing direction at each TX site and except for site 2 with only 1 transmitting direction (60 degrees coverage sector shown), the coverage for rest of the sites are a comination of 2x adjacent 60-degree sectors (120 degrees) which result from the use of 2 independant LPAA at the transmitter site as shown below.

According to radio frequency observation, the colocated transmitters can be operated simultaneously, and the networks normally operate below 10 MHz.

Normally, all the Chinese OTH-SW radars will be up at the same time using different frequencies, and their OTH-B radars will be operating simultaneously.

Source:
            OTH-SW site locations: China's OTH Network / Sean O'Connor
            http://geimint.blogspot.tw/2010/05/chinas-oth-network.html