AN/ARR-52A

AN/ARR-52A sonobuoy receiver

Technical data

The AN/ARR-52A is a sonobuoy receiver with 16 (ARR-52) or 32 channels (ARR-52A) working in the FM 162/173MHz range.
It was used by the French Navy in the Atlantic 1 long-range maritime patrol aircraft.

Last control for this unit dated January 1974. It started to work at first power-on but needed an adjustment on the first LO unit.
Measured sensivity is 10µV for a 25kHz Wide FM signal on 162.250Mhz without the AM2375/AM2376 preamplifier stages.

P7 ARINC connector

P7 Pin	Signal
1	Audio Output
2	Audio Ground
4	Bank select (Grounded to alternate)
17	Selector Ground
25	Selector +28V DC - Code ' 1'
26	Selector +28V DC - Code '10'
27	Selector +28V DC - Code '12'
28	Selector +28V DC - Code '14'
29	Selector +28V DC - Code '16'
31	Power +18V DC
32	Power Ground

Selector code

Fx	P25	P26	P27	P28	P29
F 1	0	+28V	+28V	+28V	+28V
F 2	0	0	0	+28V	+28V
F 3	0	0	+28V	+28V	+28V
F 4	+28V	0	0	0	+28V
F 5	+28V	0	0	+28V	+28V
F 6	+28V	0	0	0	0
F 7	+28V	+28V	0	0	+28V
F 8	+28V	+28V	0	0	0
F 9	0	+28V	+28V	0	0
F10	+28V	0	+28V	0	0
F11	0	0	+28V	+28V	0
F12	0	0	0	+28V	0
F13	0	+28V	0	+28V	+28V
F14	0	+28V	0	0	+28V
F15	0	+28V	+28V	0	+28V
F16	+28V	+28V	+28V	0	+28V

Pictures

Externals views

Modules slots

Modules extracted

Filters

Module 1 - Side A	Module 1 - Side B

Module 2 - Side A	Module 2 - Side B

Module 3	Module 4

Module 5	Module 5

Module 5

Preamplifier AM2375

Inside Top	Inside Bottom

7077 Triode Detail

Channel Selector working

Block Diagram

Last revision: 2020/06/20