TX56/56A and TX57/57A Installation Manual
5 April 2022
01776-00-01
Issue AD
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Trig Avionics
Page 25
these are more reliable than soldered connections, and are easier to assemble
in-situ in an aircraft, where soldering is impractical. They also allow
individual wires to be removed and replaced in a receptacle without replacing
the whole connector.
The socket contacts used in the Com connector conform to MIL part number
M39029/63-368, and are suitable for wire gauges from 20 to 24 AWG. The
socket contacts used in the Nav connector conform to MIL part number
M39029/57-354 and are suitable for wire gauges from 22 to 28 AWG.
These contacts are widely used in avionics installation, and there are many
tools available on the market that will reliably crimp them to the wiring.
Because the contacts are a MIL standard, there is also a MIL standard for the
crimp tool, although other proprietary solutions are available.
The MIL reference for the basic style of hand tool is M22520/2-01. This style
of tool can crimp many different contact types, and relies on interchangeable
"positioners" to hold the actual contact in use. The MIL reference for the
positioner that you need for the Com connector socket contacts we supply is
M22520/2-08. The MIL reference for the positioner that you need for the Nav
connector socket contacts we supply is M22520/2-06.
Any tool that complies with these references can be used to crimp these
contacts. One of the most popular vendors of these small hand tools is Daniels
Manufacturing Corporation (see www.dmctools.com). Their AFM8 hand tool
complies with M22520/2-01, their K13-1 positioner is M22520/2-08
compliant, and their K41 positioner is M22520/2-06 compliant, so this
combination will crimp all the supplied connectors.
Once crimped, the contacts should be slotted into the rear of the connector
shell. Push the contact in until the retaining tab clicks into place. Tug gently
to confirm the contact is locked in place.
5.4.5
Power and Ground Wiring
The peak current consumption of the TX56 Com radio on transmit exceeds the
current capability of a single pin on the 25 way connector. Both power inputs
must be wired, and at least two ground returns must be wired. This is
particularly important when the Nav/Com is mounted on a non-conducting
surface, such as a composite structure. Use 20 AWG wire for the power
connection wires.
Содержание TX56
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