Northern Airborne Technology 270 - Manual (Page 21)

AND SET VR3 FULLY CW (10 TURNS)
REMOVE JUMPER FOR EXTERNAL VOX THLD.
MIC SDTN
VR4
(G)
(B)
MS1 MS2
SP BIAS
CONTROL
(V)
(L)
VOX THLD
VR3
RCVR
VR2
GAIN
VR1
MIC
MS4 MS3
MLOAD
MBIAS
(8)
(G)
(K)
LOAD FUNCTION
MS5 MS6
(V/L)
NC
NC
(600)
(8)
MINI-SWITCHES
NO
J2 J1
DC COUPLE
NO
EXT. THLD
VOX
600 /GND
BIAS
600
BIAS LATCH
MS1 - RELAY CONTROL SEL.
MS2 - SPARE IN BIAS SEL.
MS2
270-40 PCB
MS1
600
KEYED 8
VOX/LATCH
MS5 - AUDIO OUT LOAD SEL.
MS6 - RELAY FUNCT. SEL.
270-40 PCB
MS6
MS5
MINI-SWITCHES
MS4 8
MS3 - MIC IN BIAS SEL.
MS3 600 /GND
J1
J1 - MIC-OUT DC-COUPLE SEL.
INSTALL JUMPER FOR DC COUPLING
REMOVE JUMPER FOR AC COUPLING
J2
JUMPER J2
270-40 PCB
MS4 - MIC OUT LOAD SEL.
JUMPER J1
MINI-SWITCHES
INSTALL JUMPER FOR INTERNAL VOX THLD. (VR3)
(600)
(B)
J2 - SPARE-IN VOX THLD SEL.
P1 - 25 PIN D-SUB CONNECTOR
RELAY K1
C 2005