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AN/APQ-39

Description of the radar set, tactical-technical characteristics

Figure 1: AN/APQ-39 (XA-3), left the transmitter, right the receiver

Figure 1: AN/APQ-39 (XA-3), left the transmitter, right the receiver

Specifications
frequency: 34.5 GHz
(Ka-Band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 683 Hz
pulsewidth (τ): 0.8 µs
receive time:
dead time:
peak power: 9 kW
average power: 5 W
instrumented range:
range resolution:
accuracy:
beamwidth: 0.6°
hits per scan:
antenna rotation:
MTBCF:
MTTR:

AN/APQ-39

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:

  1. 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)
  2. Kaplan, S. M., “Development of Airborne Cloud Base and Top Indicator - AN/APQ-39”, General Electric Co., Electro Mechanical Division, Schenectady, N. Y.