Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
ITEM NAME: DATA SWITCHING GROUP
TYPE: G9-266/SSA, OA-266A/SSA, OA-266B/SSA
Input Impedance
from the data switching group. Ten radar selector
Video Output Cathode Follower: 50 ohms
switches and their associated servo systems are
Trigger Output Cathode Follower: 70 ohms
mounted to the door of the cabinet.
A clutch
Output Impedance
arrangement permits the selector switches at the data
Video: 70 ohms
switching unit to be manually operated.
Trigger: 70 ohms
The equipment forms a part of a Data Distribution
Master Radar Inputs: 15; OA-266A/SSA and
Group for naval vessels.
OA-266B/SSA wired for 10.
Data on this sheet reflects the following Field
Remote PPI Outputs: 10
changes, No. 2.
Operating Power Requirements: 115v, 60
cps, 3-ph at 15 amp; 115v, 60 cps, 1-ph
at 5 amp.
RELATION TO SIMILAR EQUIPMENT
Heat Dissipation: 300w
Ambient Temperature Range: -28C to 65C.
The OA-266A/SSA and OA-266/SSA are electrically and
mechanically interchangeable except for mechanical
INSTALLATION CONSIDERATIONS
fabrication and assembly changes in a minor degree not
affecting space configuration of the unit nor major
Related Equipment:
subassemblies. The OA-266B/SSA is functionally but not
Required but not Supplied.
mechanically interchangeable with the OA-266A/SSA and OA-
(1) Amplifier Assembly AM-518/SSA,
266/ SSA and was used unofficially by the contractor.
(1) Switch Rotary SA-242/SSA1 (1)
Switch, Rotary SA-243/SSA and (1)
TECHNICAL DESCRIPTION
Switch, Rotary SA-247/SSA and (1)
Voltmeter, Electronic ME-55/SSA.
Range:
100
cps
to
10
mc
PRINCIPAL COMPONENTS AND PHYSICAL DATA
SHIPPING DATA
COMPONENT
BOXES
OVERALL DIMENSIONS
UNIT WT.
(NR.)
(Inches)
(Pounds)
Data Switching Group OA-266/SSA or
22.2 x 38.5 x 81.5
970
Data Switching Group OA-266A/SSA or
22.2 x 38.5 x 81.5
955
Data Switching Group OA-266B/SSA
22 x 39 x 80.7
1090
EQUIPMENT SUPPLIED DATA
COMPONENTS
QTY
OVERALL DIMENSIONS
UNIT WT.
(Inches)
(Pounds)
Data Switching Group OA-266/SSA or
1
14 x 28.6 x 74.2
740
Data Switching Group OA-266A/SSA or
1
14 x 28.6 x 74.2
725
Data Switching Group OA-266B/SSA
1
19 x 27.68 x 74.2
850
REFERENCE DATA AND LITERATURE
Technical Manuals:
NAVSHIPS 91639(A)
OA-266/SSA: 2
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