JA34-001 Universal Radio Adapter
Installation Manual
Rev A
Page 5
Unless otherwise noted, all wiring shall be a minimum of 24 AWG, except power and ground lines, which shall be a
minimum of 22 AWG. Refer to the Interconnect drawing for additional specifications. Check that the ground
connection is clean and well secured, and that it shares no path with any electrically noisy aircraft accessories such
as blowers, turn-and-bank instruments, or similar loads.
2.4.2
Mechanical Installation
The JA34-001 can be mounted in any attitude and location with adequate space and sufficient clearance for the
connector and wiring harness. It requires no direct cooling.
2.4.3
Post Installation Checks
2.4.3.1
Voltage/Resistance checks.
Do not attach this unit until the following conditions are met:
a) Check P1 pin
1
for +28 Vdc power.
b) Check P1 pin
14
(Power Ground) for continuity to ground (less than 0.5
Ω
).
c) Check P1 pin
15
(Chassis Ground) for continuity to ground (less than 0.5
Ω
).
d) Check P1 pins
8
,
20,
21
and
23
(Output Ground) for continuity to ground (less than 0.5
Ω
).
e) Check all pins for shorts to ground or adjacent pins.
2.4.3.2
Configuration
Ensure that the JA34-001 contains the correct configuration settings. This may be done at the factory, on the
maintenance bench or in the aircraft before the power on checks are performed. Refer to section 2.5.
2.4.3.3
Power on Checks.
Power up the aircraft’s systems and confirm normal operation of all functions of the JA34-001 (see section 2.4.5).
a) Begin with only the pilot’s headset attached. Confirm radio operation for both receive and transmit. Check the
radio selection and inputs. Do not proceed until the radios are functioning correctly.
b) Unusual buzzes, hums or other background audio are symptomatic of multiple grounds, or noisy external
systems such as blowers or pumps sharing wiring with the audio system. If a transmitter fails to key or
correctly modulate it is often the result of not connecting all required grounds to the radio or external audio
system.
c) Check that all configurations settings are correct.
When all performance checks are satisfied, complete the necessary regulatory documentation before releasing the
aircraft for service. Refer to
Appendix B.
2.5
System Operation
The JA34-001 is a remote mount unit and has no user accessible controls.
2.5.1
Configuration Operation
The JA34-001 accepts commands on the Configuration connector via the configuration cable (JA99-001) and the
configuration tool (ProCs™). (See section 2.6 Adjustments and Configuration)
2.5.2
Receive Operation
The RECEIVE INPUT is level controlled and summed with the MIC INPUT (Sidetone) and routed to the RECEIVE
OUTPUT.
2.5.3
Sidetone Operation
The MIC INPUT audio is level controlled and summed with the Receive Audio and routed to the RECEIVE OUTPUT.
