Description of the radar set, tactical-technical characteristics
Figure 1: VRRVY
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||360 or 720 Hz|
|pulsewidth (τ):||1 or 2 µs|
|peak power:||400 kW|
|average power:||350 W|
|instrumented range:||300 km|
|hits per scan:|
|antenna rotation:||2; 4 or 6 rpm|
VRRVY (Abbr. of Viestiväline, Radio, Radar, Valvonta ja Yleis, i.e: Communication, radio, radar, surveillance and miscellaneous) is a historical radar operating in the S-Band, which could be used both as a rotating surveillance radar and as a heightfinder radar.
The reflector antenna consists of two parts, the surface of which is made of thin rods. These rods are oriented so that the radar operates as a heightfinder radar when polarized vertically and as a rotating surveillance radar when polarized horizontally. For this purpose, the radiator is rotated 90° by an electromagnet. In the heightfinding mode the antenna swivels 4 or 8 times per second by 30° in the elevation.
The prototype was built in 1955. A total of 10 of these radars were built. One of them is still existing in the Air Force Museum of Finland (62°23'15.0" N 25°40'46.8" W).