EQUIPMENT MANUAL 251-16-1
251/251-16-1
Page 6
3.0 INSTALLATION PROCEDURES, WIRING DIAGRAM, AND LIMITATIONS
3.1 PHYSICAL
Installation dimensions are shown on the Model 251 outline on Figure 1. The amplifier should be
mounted to a metal surface and it is necessary to ground the case to the metal aircraft structure.
The case is finished with an electrically conductive film so it is not necessary to remove the film for
electrical bonding.
The Model 251 may be mounted in any position. No shock or vibration isolators are required.
3.2 ELECTRICAL
Connections to the Model 251 are made through three "D" subminiature connectors. The mating
connectors are manufactured by Positronics Industries, Inc. and the part numbers for the
complete connector assemblies are:
Connector
Positronics Part No.
P40 (25 pin) SD25F10JVLO
P50 (37 pin) SD37F10JVLO
P60 (9 pin) SD9F10JVLO
Numerical pin identifications are shown in this section. The wiring diagram is shown on Figure 2.
Shielded wire must be used where indicated on the diagrams. AWG 22-24 size wire should be
used for all connections except those to the input power, power ground, and speaker amplifier
outputs where AWG 20 size should be used. Multiple power, ground, and speaker output pins are
provided to allow parallel connection of wiring. This reduces voltage drops (losses) across the
wiring and provides the best audio performance.
The control switches shown will switch low current loads and should have a DC rating of 28 VDC.
Typical switches for this application include Alco MTA series.
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