Nat AA34-200 - 2.5.3 Internal Adjustments (AA34-300 and AA34-301 only); 2.5.3.1 8;600 Ω Audio Output Impedance Adjustment; 2.5.3.2 8;150 Ω Mic Output Impedance Adjustment

AA34 Series Universal Radio Interface
SM36 Installation and Operation Manual
Section 2 Rev: 1.01 Issue 4 Page 2-6
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.5.3 Internal Adjustments (AA34-300 and AA34-301 only)
CAUTION:
The AA34 Series Universal Radio Interface contains static sensitive devices.
Proper ESD handling procedures must be followed to prevent damage to the unit.
Sidetone Level
Adjustment
Audio
Output
Jumpe
r
C1/C2 Mic
Isolation/Direct
Switch
S1 Mic DC Bias
S2 Mic Output Blocking
RX Level
Adjustment
Mic Output Level
Adjustment
Mic Output
Jum
p
er
S1 S2
2.5.3.1 8/600 Ω Audio Output Impedance Adjustment
Remove the cover from the AA34 and locate the 8/600 Ω adjustment jumper JP2. When the jumper is
connected across pins A and B, the unit is set to operate with an 8 Ω load connected. When connected
across B and C, the unit is set to operate with a 600 Ω load connected. (The default setting is B – C).
2.5.3.2 8/150 Ω Mic Output Impedance Adjustment
Remove the cover from the AA34 and locate the 8/150 Ω adjustment jumper JP1. When the jumper is
connected across pins A and B, the unit is set to operate with an 8 Ω load connected. When connected
across B and C, the unit is set to operate with a 150 Ω load connected (The default setting is B – C).