Japanese Navy Type 3 Mark 1 Model 3 Radar Receiver

This VHF receiver is part of the Japanese Navy Type 3 Mark 1 Model 3 Radar Set (No.13 Radar Set), and was made by the Navy YOKOSUKA arsenal in September 1944.

This set is a semi-fixed anti-aircraft surveillance radar for ground troops, introduced in 1943. This radar was small and lightweight so it was very easy to deploy. It was used not only on the ground, but on almost all vessels from aircraft carriers to submarines. As a result, more than 2,000 units of the No. 13 radar set were produced . This was one of the most successful anti-aircraft warning radars in the Japanese Navy.

There is a compete Navy Model 3 Mark 1 Type 3 Radar set at the Yokohama Radio Museum.

No. 13 Radar Set Specifications

Purpose of use: Anti-aircraft surveillance

Installation: Land, ship, submarine

Effective distance: Formation aircraft 100 Km or more, single aircraft 50 Km or more

Frequency: 150 MHz

Repeat frequency: 500 Hz

Pulse width: 10 μs

Transmission peak output: 10 Kw

Antenna: Combined transmission and reception, Half-wave dipole horizontal 2 element 4 stack, with reflector

Transmitter: Oscillator tube T-311 x2 (P.P.)

Modulation method: Pulse modulation, modulation tube T-307

Receiver: Superheterodyne (11 tubes), RF 2 stage (UN-954 x2), mixing (UN-954), local oscillator (UN-955), IF 5 stage (RH-2 x5), detector (RH-2 ), LF amplifier (RH-2)

IF frequency: 14.5 MHz

Bandwidth: ± 100 KHz Total gain is 120 db or more

Signal display: A scope

Measurement method: Maximum sensitivity method

Distance measurement accuracy: 2-3 Km

Angle measurement accuracy: 10 °

Power supply: Single-phase 110 / 220 VAC power supply

Weight: 110 kg

Manufacture: TOSHIBA , ANRITSU