SWR-503 (HFSWR)

The SWR-503, also known as HFSWR, is an Over-The-Horizon Surface Wave (OTH SW) early warning radar system operating in the HF band (3-5 MHz). It provides simultaneous, all-weather surveillance of ocean-going vessels and aircraft within a 200 nautical mile (370 km) Exclusive Economic Zone (EEZ). The system employs a co-located transmit and receive architecture, utilizing a 7-element logarithmic-periodic monopole transmit antenna with 8 dB gain and a 120-degree half-power beamwidth to floodlight the surveillance area with a phase-coded pulse sequence. Directional information is derived from a 16-monopole doublet linear receive antenna array, with elements spaced 33 meters apart, through phased array techniques and digital beam synthesis. Manufactured by Raytheon E-Systems (specifically Raytheon Canada Ltd for some deployments), SWR-503 systems have been operational on Canada's East Coast since 1999 and on the Romanian Black Sea coast (Cap Midia) since 2009.

radartutorial.eu: https://www.radartutorial.eu/19.kartei/01.oth/karte011.en.html