Description of the radar set, tactical-technical characteristics
Figure 1: Type 279 antenna: two horizontal dipoles with each a reflector behind it.
|frequency:||39 … 42 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||50 Hz|
|pulsewidth (τ):||7 … 30 µs|
|peak power:||60 or 70 kW|
|instrumented range:||65 … 95 NM|
(≙ 120 … 175 km)
|hits per scan:|
The Type 279 radar was a British naval early-warning radar developed during World War II from its prototype, the Type 79 metric early-warning set. The radar was operating in A-Band. The frequency was low, 39 to 42 MHz, depending on the version. The radar produced both a ground wave clinging to the sea (nominal range 2 to 6 NM) and an airwave, and initially, it was seen as a dual-purpose air- and surface-warning or ranging set. It reverted to air warning only with the advent of the gunnery radars, Types 282 through 285.
Type 279 initially had separate transmitting and receiving antennas that were later combined in the Type 279B to single-antenna operation. The 279B antenna proper consisted of four horizontal dipoles, each with a reflecting dipole a fifth of a wavelength behind it.