Description of the radar set, tactical-technical characteristics
Figure 1: AN/APQ-39 (XA-3), left the transmitter, right the receiver
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||683 Hz|
|pulsewidth (τ):||0.8 µs|
|peak power:||9 kW|
|average power:||5 W|
|hits per scan:|
The AN/APQ-39 was an operating in Ka-Band cloud detector radar that was used as weather & navigational radar in the Boeing B-52D Stratofortress.
The radar was developed between 1953 and 1958 as airborne radar. The test version AN/APQ-39(XA-3) was converted to separate transmit and receive antennas due to high losses in the duplexer. It continued to be operated in stationary mode until 1968.
Sources and ressorces:
- Wilk, K. E., “Evaluation of the AN/APQ-39(XA-3) cloud detector radar”, Final Report, Contract AF19(604)-1395. 39 pp. Mar.1955 - Mar.1958. (online PDF)
- Kaplan, S. M., “Development of Airborne Cloud Base and Top Indicator - AN/APQ-39”, General Electric Co., Electro Mechanical Division, Schenectady, N. Y.