Jabiru J450 Constructors Manual
Post-Paint>Fuselage>Install electrical wiring
Tuesday, April 6, 2010
236 of 343
Connect the VHF antenna cable
The VHF coaxial antenna cable was installed in the
Pre-Paint>Fuselage>Fit control cables
and lines
task and connected to the VHF antenna in the
Pre-Paint>Fuselage>Empennage>
Fit vertical tail fin
task. Trim the cable off level with the top of the firewall and fit the BNC
connector that is supplied with the wiring kit (fitting instructions are included).
Fit the transponder encoder, antenna and cable
Start by mounting the encoder unit to the
firewall with the connecting plugs end
facing downwards – the encoder unit
attaches to a base (both shown at right)
with a thumbscrew so the base can be
mounted to the firewall with 3 stainless
steel self-tapping screws and then the box
is fitted into it. Make sure that the
encoder will mount above the throttle
shaft and not foul the back of any
instruments when the panel is fitted.
The static line up from the console will
need to be branched with a “T” piece to
connect to the encoder before connecting to the other static instruments.
Fit the supplied wiring harness plug to the encoder unit, tighten the plug retaining screws by
hand and leave the other end free for later connection to the transponder unit when the
instrument panel is fitted.
Mount the transponder antenna under the fuselage (shown fitted below right)– you will need
to drill a 22mm hole through the floor of the aircraft on the centerline 415mm back from the
base of the firewall. The antenna must be mounted facing down with the ground plane (the
large round plate) fitted against the fuselage and held in place with the antenna flange. Smear
the top of the ground plane with white silicone sealer before fitting to seal it to the fuselage.
The retaining nut and washer can then be
fitted from inside the fuselage – you will
have to work inside the front section of
the console for this step.
Tighten the retaining nut firmly: do not
over-tighten, then wipe away any excess
silicone sealer that may have squeezed
out from around the ground plane.
Connect the supplied coaxial antenna cable to the back of the antenna and route the cable out
of the console and up the firewall for later connection to the transponder unit when the
instrument panel is fitted. Route the coaxial cable so that all bends are gentle and take care to
avoid crushing the coaxial cable in any way.
This completes the
Post-Paint>Fuselage>Install electrical wiring
task.