Rev B
Page 1
JA39-022 Headset Adapter - 230 Ω Mic - 230 Ω Phones
SECTION 1 - DESCRIPTION
1.1
System Overview
The JA39
-022 Headset Adapter -
230 Ohm Mic
-
230 Ohm Phones allows a
PELTOR
™
headset to be used with a
high impedance aviation audio controller. The
JA39-
022 operates using the microphone bias supply of the audio
controller and requires no other external power. The phones audio from the audio controller is routed directly to the
headset phones without impedance matching.
1.2
Features Overview
The JA3
9-
022 unit features an industry standard aviation headset pin
-
out for the plug.
The JA39
-
022 unit features the
PELTOR
™
standard headset pin
-
out for the jack.
The JA39
-022 plugs in-
line with the headset cord.
The JA39
-
022 uses a metalized enclosure to shield the circuitry from Radio Frequency Interference.
1.3
Inputs and Outputs
Refer to the
JA39-022 connector maps f
or the mating connector designators and
pin
assignments for the
input and output signals.
1.3.1
Inputs
Name
Qty Type
MIC INPUT ±
2
Audio signal
PHONES INPUT
2
Audio signal
1.3.2
Outputs
Name
Qty
Type
MIC OU
T
PUT HI/LO
2
Audio signal
PHONES OU
TPUT ±
2
Audio signal
1.3.3
Mic Bias Voltage Supply
The Microphone Output accepts a DC MIC INPUT bias voltage supply from the Audio Controller.
1.3.4
Input and Output Polarities
The JA39
-
022 is designed to operate regardless of the input and output polarities of the attached audio controller and
headset.
