GMA
340 Installation Manual
Pag
e B
-9 (Pag
e B-
10 b
lan
k)
190-
001
49
-01
Rev L
Figure B4. J1 INTERCONNECT WIRING DIAGRAM
EXT AMBER LAMP (M)
MKR ANT
MKR ANT RETURN
MASQ INH
NC
COM 1
Transceiver
COM 2
COM 3
NAV 1 Radio
DME Radio
J1
MIDDLE MKR SENS
GND LUG
PTT
25
26
9
10
11
12
27
28
13
14
15
30
23
24
3
4
5
6
17
18
19
20
21
22
7
8
31
32
44
43
35
34
33
41
40
42
36
37
38
39
1
2
16
29
(up
to
4
jacks,
wired
in
parallel)
1.
UN
LES
S
O
T
H
E
RWISE
IND
IC
ATE
D,
AL
L
S
HIEL
DS
MUS
T
BE
T
E
RMINA
TED
AT
T
H
E
GMA
3
4
0
E
N
D
ONL
Y
.
2.
AL
L
W
IR
E
SIZE
S
HOUL
D
B
E
A
WG
24
OR
LA
RGER
,
T
EF
LO
N
IN
SUL
AT
E
D
,
E
X
C
EPT
FO
R
T
HE
F
O
LL
OWING:
J
2
P
INS
8
,
9.
10
,
1
1
(A
W
G
2
2,
T
E
FL
ON
IN
SUL
ATE
D
)
J2
PINS
4
3,
4
4
(AWG
22,
T
EFL
O
N
INSU
L
ATED)
3.
SOME
COMMUNICATION
T
R
ANSCEIVERS
REQUIRE
T
H
EIR
SPEAKER
OU
T
P
U
T
TO
BE
LOADED
F
OR
PROPER
OPERAT
ION.
THE
G
MA
340
PROVIDES
IN
T
E
RNAL
DUMMY
LOADS
FOR
T
HIS
PURPOSE.
CO
NNE
CT
ON
LY
IF
REQ
UIRED
.
R
E
F
E
R
T
O
T
R
AN
SCE
IVER
DO
CUME
NTA
T
ION
.
4.
CONNECT
LIGH
T
ING
BUS
AS
SHOWN
IN
T
H
E
F
OLLOWING
TABLE:
5.
AL
L
H
EAD
SET,
M
IC
ROP
HONE
,
A
ND
MU
SIC
PH
ONE
P
L
U
G
S
MUS
T
B
E
E
L
E
C
T
RICA
LL
Y
IS
O
L
A
T
E
D
FRO
M
GR
OUN
D.
T
HIS
MA
Y
R
EQU
IR
E
T
H
E
USE
OF
IN
SUL
ATIN
G
W
AS
HE
RS
WHE
N
MOU
N
T
IN
G
T
H
E
PHO
N
E
PLUGS.
A
DDITIONALLY,
T
H
E
S
PEAKER
RE
T
U
RN
MUST
B
E
ISOLA
T
E
D
F
R
O
M
G
ROUND.
6.
PA
MUT
E
IS
A
N
O
U
T
PU
T
F
ROM
T
HE
GMA
340
T
H
A
T
IS
PULLED
LOW
WHEN
A
C
T
IVE.
IT
IS
USED
TO
T
R
IGGER
T
H
E
MUTE
FUNC
T
ION
ON
AN
EXT
E
RNAL
PA
SYST
EM
.
7.
NORMALLY,
A
NY
ICS
(INT
E
RCOM)
AC
TIVI
T
Y
W
ILL
CAUSE
T
H
E
M
USIC
1
S
OURCE
TO
BE
MU
T
E
D.
IF
TH
IS
IS
N
O
T
D
E
S
IR
E
D
,
T
H
E
N
J2
PI
N
1
3
M
U
S
T
B
E
C
ONN
E
CT
ED
T
O
J
2
PIN
1
4
,
EIT
H
E
R
P
ER
M
A
N
E
N
T
L
Y
,
O
R
V
IA
A
S
WIT
CH.
8.
J2
PIN
1
7
(8
OHM
S
E
L
E
C
T
*)
IS
ONL
Y
FOR
US
E
IN
INS
T
A
LLA
T
IO
N
S
W
HE
RE
AN
8
O
HM
CAB
IN
SP
EAK
ER
IS
INST
ALLED.
THE
FUNCTION
ALLOWS
T
H
E
S
AME
POWER
TO
BE
DELIVERED
T
O
AN
8
OHM
SPEAKER
AS
WOU
LD
NO
RMA
LLY
BE
DEL
IVER
ED
T
O
A
4
OHM
S
PEA
KE
R.
IF
A
N
8
O
H
M
S
PEA
KE
R
IS
U
SED
AND
T
H
E
SPEAKER
VOLUME
IS
ACCEPT
ABLE,
T
H
EN
T
H
IS
PIN
S
HOULD
BE
LEFT
OPEN.
IF
AN
8
O
HM
CABIN
SPEAKER
IS
USED,
BUT
MORE
S
PEAKER
V
OLUME
IS
DESIRED,
T
H
EN
J2
PIN
17
MUST
B
E
TIED
T
O
GR
OUN
D
A
ND
T
H
E
SPE
AK
ER
VOL
UME
SHO
ULD
B
E
R
EAD
JU
STED
.
D
O
N
OT
GROU
ND
J2
PIN
1
7
IN
A
4
OHM
CABIN
SPEAKER
INST
ALLAT
ION.
9.
J2
PIN
1
9
(T
ONE
E
N
ABL
E*)
C
A
N
B
E
L
E
F
T
OPE
N
O
R
T
IED
T
O
G
ROU
ND.
IF
T
IED
TO
GROU
ND,
T
H
EN
A
SH
ORT
A
UDIBL
E
T
O
N
E
W
ILL
BE
HE
ARD
IN
T
H
E
PILOT
A
N
D
C
OPILO
T
H
E
A
D
S
E
T
S
EAC
H
T
IME
A
B
U
T
TO
N
IS
PRE
SS
ED.
IF
L
EF
T
O
P
EN,
N
O
TO
NE
IS
H
E
A
RD.
10.
USE
COAX
M
EET
ING
T
HE
APPLICABLE
AVIATION
R
EGULA
T
ION
FOR
T
HE
MARKER
BEACON
AN
T
E
NNA
CA
BL
E.
W
H
EN
ROU
TING
T
H
E
M
A
R
K
E
R
B
EA
CON
A
N
T
ENN
A
CA
BL
E,
AV
OID
S
H
ARP
C
O
R
NER
S
A
N
D
RO
UT
E
A
W
A
Y
F
RO
M
H
IGH
C
U
R
REN
T
WIR
ING
AND
ANY
T
RAN
SMITT
ER
A
N
T
E
NNA
C
ABL
ES
.
11
.
P
INS
3
1
AN
D
3
2
O
F
J
1
A
RE
UN
SWITCHE
D,
UNM
UTED
INP
UTS.
P
INS
4
3
AN
D
4
4
O
F
J
1
ARE
U
N
S
WIT
C
HED
INPUT
S.
1
2
.
J
2
P
IN
S
1
0
A
N
D
1
1
SH
OU
LD
BE
CONN
EC
T
E
D
D
IR
ECT
L
Y
T
O
T
HE
AIR
F
R
AME
U
SIN
G
MIN
IMU
M
W
IR
E
LE
N
G
T
H
.
340,
340H
Transceiver
NAV 2 Radio
ADF Radio
NOTES P
E
RTAINING TO J1
A
ND J2
VOL
TA
GE
L
O
W SI
DE
OF
BU
S
28
V LIGH
TING
J2
P
IN
7
14
V LIGH
TING
J2
P
INS 6 A
ND 7
J2 PINS 5
A
ND 6
J2
PIN 5
HIGH
S
IDE
OF B
U
S
Transceiver
Altitude Warning Audio
Telephone Audio
EXT Indicator
FLT CTRL System
Marker Beacon Antenna
See note 14
EXT BLUE LAMP (O)
EXT WHITE LAMP (A)
P
ASS
HEADSET RETURN
P
ASS
HEADSET R
P
ASS
HEADSET L
PILOT MIC KEY
PILOT MIC RETURN
PILOT MIC IN
TEL RINGER RETURN
TEL RINGER IN
ALT WRN RETURN
ALT WRN IN
ADF RETURN
ADF IN
DME RETURN
DME IN
NAV 1 RETURN
NAV 1 IN
NAV 2 RETURN
NAV 2 IN
COM 3 MIC
COM 3 KEY
COM 1 SPKR LOAD
COM 1 SPKR LOAD RETURN
COM 2 SPKR LOAD RETURN
COM 3 RETURN
COM 3 IN
COM 2 MIC
COM 2 KEY
COM 2 RETURN
COM 2 IN
COM 1 MIC
COM 1 KEY
COM 1 RETURN
COM 1 IN
COM 2 SPKR LOAD
COM 3 SPKR LOAD
COM 3 SPKR LOAD RETURN
See note 3
See note 3
See note 3
