TM 11-6625-2398-15-3
CHAPTER 3
OPERATING INSTRUCTIONS
Section I. OPERATOR'S CONTROLS AND CONNECTORS
3-1. Hybrid Attenuator Al, Operating Control,
(less insertion loss of the
Connectors and Cable
cables and hybrid junction)
at RF IN/OUT jack J1. May
also be used as an output
Control or cable connector
Function
connection when rf signals
ATTENUATOR control
Provides continuously variable
are applied at RF IN/OUT
AT1( variable attenuator)
control of the attenuation
jack J1 (see above).
between ATTEN OUT jack
CPLR IN jack J3
Permits connection of exter-
J4 and ATTEN 1N/RF DIFF
nal equipment or ATTENU-
jack J5 from 0 to 25dB
ATOR AT1 (via A1W3) to
ATTEN IN RF DIFF jack
Permits connection of external
the hybrid junction. When
J5
equipment to ATTENUA-
used as an input connection,
TOR AT1.
rf signals applied at this
ATTEN OUT jack J4
Permits connection of ex-
jack appear (less insertion
ternal equipment or the hy-
losses ) at RF IN/OUT jack
brid junction of the hybrid
J1. May also be used as an
attenuator to ATTENUA-
output connection when rf
TOR AT1.
signals are applied at RF
Cable W3
Permits series connection of
IN/OUT jack J1 (see above).
ATTENUATOR AT1 and
the hybrid junction by
interconnecting ATTEN OUT
3-2. Front Panel Test Adapter
A2,
Operating
jack J4 and CPLR IN jack
Control and Connector
J3
RF IN OUT JACK J1
Permits connection of exter-
nal equipment to the hybrid
Control or cable connector
Function
junction. When used as an
Plug P1
Connects front panel test
input connection, rf signals
adapter to TEST connector
applied at this jack are
1A3J1 on the front panel
equally split and appear in
of the receiver-transmitter.
attenuated from (approxi-
VIDEO switch S1
Selects various signals of the
mately 6dB down) at both
receiver-transmitter for
RF SUM jack J2 and CPLR
monitoring at VIDEO jack
IN jack J3. When used as
J1 as follows:
an output connection, rf sig-
nals applied at either RF
Position
Signal
SUM jack J2 or CPLR IN
jack J3 appear in attenu-
RETURN
+28 vdc return
ated from (approximately
(GND)
(system
6dB down) at this jack.
ground)
RF SUM jack J2
Permits connection of exter-
ISLS GATE
Isls gate input
nal equipment to the hybrid
CHAL
Challenge vi-
junction. When used as an
VIDEO
deo input
input connection, rf signals
SUM IF
Detected sum
applied at this jack appear
VIDEO
channel re
play video
3-1
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