The RP-5 Izumrud radar is an update of the RP-1, installed in the first serial aircraft. It has a detection range of up to 12 Km (6.5 nm) for bomber sized contact and 9 Km (4.8 nm) for a fighter sized one.
Interestingly enough it had two antennas: one for searching and one for tracking, making it probably the first radar to have Track-While-Scan (TWS) capability.
It can autolock at ranges from 2 to 4 Km (1 to 2.2 nm) and provide targeting information to the pilot with the help of the AR-18-8 gunsight.
Like all 1st generation radars, it was prone to ground cluttering, which limited its use to altitude above 2000 m (6,600 ft) above the ground. Its best operational altitudes are above 3600m (11,800 ft) AGL.
The search antenna can track up to 10 contacts, while the tracking one is permanently set in STT (Single Target Track).
The visible cone belongs to the tracking antenna.