Nat AA34-200 - 2.5.2 Internal Adjustments (AA34-200 only); 2.5.2.1 30;200 mV Mic Output Level Adjustment; 2.5.2.2 RX Gain Adjustment; 2.5.2.3 RX Output Impedance Adjustment

AA34 Series Universal Radio Interface
SM36 Installation and Operation Manual
Section 2 Rev: 1.01 Issue 4 Page 2-5
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.5.2 Internal Adjustments (AA34-200 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.
D E
C1/C2: Mi
c
Isolation/ Direc
t
Switch
S1: Mi
c
DC Bias
S2: Mic Outpu
t
Blocking
Capacito
r
RX High Gain
Jumpe
r
RX Output Impedance Jumper
(normally soldered F-G)
Sid
etone
L
eve
l
Adjustment
Mic Output Level
Adjustment
A
-B-C Mic
Output Jumper
RX Level
A
djustment
OPEN
S1 S2
C1
C2
2.5.2.1 30/200 mV Mic Output Level Adjustment
Remove the cover from the AA34-200 and locate the Mic Output jumper. When the jumper is connected
across pins A and B, the unit level is set at 200 mV. When connected across B and C, the unit level is set
to 30 mV. (The default setting is A – B).
2.5.2.2 RX Gain Adjustment
Remove the cover from the AA34-200 and locate the RX Gain jumper. When the jumper is connected
across pins D and E, the unit is set to operate at high gain. When not connected, the unit is set to
operate at low gain (default setting).
2.5.2.3 RX Output Impedance Adjustment
Remove the cover from the AA34-200 and locate the RX Output Impedance jumper. The factory default
is 600 Ω (jumper soldered across F and G). If connected across G and H, the unit is set to 150 Ω.