Icom IC-7800 Instruction Manual

1
PANEL DESCRIPTION

I Rear panel

EXT-DISPLAY KEY BOARD
#3 #4 #2
q ANTENNA CONNECTOR 1 [ANT 1] (p. 2-4)
w ANTENNA CONNECTOR 2 [ANT 2] (p. 2-4)
e ANTENNA CONNECTOR 3 [ANT 3] (p. 2-4)
r ANTENNA CONNECTOR 4 [ANT 4] (p. 2-4)
Accept a 50 Ω antenna with a PL-259 plug connec-
tor.
t GROUND TERMINAL [GND] (p. 2-3)
Connect this terminal to a ground to prevent electri-
cal shocks, TVI, BCI and other problems.
y CIRCUIT BREAKER
Cuts off the AC input when over-current occurs.
u RECEIVE ANTENNA B OUT [RX ANT B– OUT]
i RECEIVE ANTENNA B IN [RX ANT B– IN]
Located between the transmit/receive switching cir-
cuit and receiver's RF stage in SUB band (MAIN
band during split operation).
Connects an external unit, such as preamplifier or
RF filter, using BNC connectors, if desired.
When no external unit is connected, [RX ANT B–
OUT] and [RX ANT B– IN] must be shorted with the
supplied coaxial cable. (p. 2-2)
[RX ANT A/B]
Receiver
Transmitter
q w
ANT 1 ANT 2
S/P DIF
RS-232C REMOTE OUT IN
#1 #0 @9 @8
IN OUT
Transmit/Receive
switching circuit
e r t
ANT 3 ANT 4
REF I/O DC OUT
10MHz 15V EXT
-10dBm MAX1A METER KEYPAD KEY RELAY
@7 @6 @5 @4 @3 @2
o TRANSVERTER CONNECTOR [X-VERTER]
(p. 2-5)
External transverter input/output connector.
Activated by voltage applied to [ACC 2] pin 6, or
when the transverter function is in use. (pgs. 2-10,
4-6)
!0 RECEIVE ANTENNA A OUT [RX ANT A– OUT]
!1 RECEIVE ANTENNA A IN [RX ANT A– IN]
Located between the transmit/receive switching cir-
cuit and receiver's RF stage in MAIN band (SUB
band during split operation).
Connects an external unit, such as preamplifier or
RF filter, using BNC connectors, if desired.
When no external unit is connected, [RX ANT A–
OUT] and [RX ANT A– IN] must be shorted with the
supplied coaxial cable. (p. 2-2)
!2 MAIN POWER SWITCH [I/O] (p. 3-2)
Turns the internal power supply ON and OFF.
!3 AC POWER SOCKET [AC] (p. 2-4)
Connects the supplied AC power cable to an AC
line-voltage receptacle.
!4 EXTERNAL SPEAKER JACK MAIN [EXT-SP MAIN]
(p. 2-5)
!5 EXTERNAL SPEAKER JACK SUB [EXT-SP SUB]
(p. 2-5)
Connects an external speaker (4–8 Ω), if desired.
1-12
y u i o !0
OUT
IN X-VERTER OUT
RX ANT
B
AC
GND
B
A
ALC
ALC ADJ ACC 2 ACC 1 ACC 2 ACC 1
@1 @0 !9 !8 !7 !6
!1
IN
RX ANT
A
I
!2
!3
EXT - SP
SUB MAIN
!5 !4