11-6625-928-12
TM
2-4.1
Interconnecting
Box
J-4247/AR
Controls and Connectors (fig. 2-3)
Function
Switch Position
Control or Connector
When testing 115 volt 400 Hz panel lit radio, routes panel
AC
PNLLMP Switch S1
light power from connector J1 to connectors P4, P8, and
P9.
Disconnects all panel lighting to the radio set under test.
OFF
DC
When testing 0-28 volt direct current panel lit radio, routes
28 VDC primary power from connector P3 to con-
nectors P4, P8, and P9.
Enables receiver-transmitter to power itself internally.
ON
OFF
Disables primary power internally to the receiver-
transmitter.
-Ahl
Directs receiver-transmitter t o transmit/receive AM
s i g n a l s through RF connector J4 on receiver-
transmitter and FM signals through RF connector J3
on receiver-transmitter.
EM
Directs receiver-transmitter to transmit/receive both
AM and FM signals through RF connector J3 on
receiver-transmitter-
Directs receiver-transmitter control via controls o n
TAKE CONT switch S4
RT
receiver-transmitter-
Directs receiver-transmitter control via control on remote
RMT
control unit.
TN
Directs receiver-transmitter to transmit as low-level 150 Hz
SQUELCH switch S5
tone on top of normal transmit signal.
Estahlishes even parity for MIL-STD-1553 buss address
EVEN
PARITY switch S6
connector P1.
Establishes odd parity for MIL-STD-1553 buss address
ODD
connector P1.
Directs receiver-transmitter to process wideband X-mode
WB
audio signals-
NB
Direct~ r e c e i v e - t r a n m i t t e r t o process narrowhand
X-mode audio signals,
Directs remote control unit to process received audio
VOL CONT switch S8
signals out to a specified minimum level-
Directs remote control unit to process received audio
signals out to a zero minimum level.
Directs the MIL-STD-I553 receiver-transmitter to tune
EMER switch S9
to 121.5MHz for AM operation.
Allows the MIL-STD-1553 receiver-transmitter to be
controlled by normal buss address signals-
Directs the hlIL-STD-1553 receiver-transmitter to turn
to 40.5MHz for FM operation-
SPARE switch S10
Not connected
LD
MODE switch S11
Directs the MIL-STD-l553 receiver-transmitter to load a
new frequency into memory through buss address
connector PI-
NORM
Directs the
MIL-STD-1553
receiver-transmitter
to
operate via routine buss commands-
FLT
Directs the MIL-STD-1553 receiver-transmitter to operate
on the preselected channel 1 frequency-
PTT test point TP1
Provides access to monitor push-to-talk control link,
TN KEY test point TP2
P r o v i d e s access to monitor 1000 Hz transmit tone
control line,
A(-1D IN LVL ADJ test
Connects to audio signal generator to provide transmit
-
points TP28 and TP29
audio in.
CLOCK test points TP3
Provides access to monitor clock control lines.
and TP4
DATA test points TP5
Provides access to monitor Data control lines.
and TP6
--
Change 5
2-11
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