Icom IC-7800 Instruction Manual

1-12

■ Rear panel

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)

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.

Receiver

Transmitter

IN

[RX ANT A/B]

OUT

Transmit/Receive

switching circuit

1

PANEL DESCRIPTION

MAIN

SUB

ACC 1

ACC 2

ACC 1

ACC 2

ALC

ADJ

ALC

RELAY

KEY

EXT

KEYPAD

METER

DC OUT

15V

MAX1A

REF I/O

10MHz

-10dBm

IN

OUT

REMOTE

RS-232C

KEY BOARD

EXT-DISPLAY

A

B

S/P DIF

EXT-SP

ANT 1

ANT 2

ANT 3

ANT 4

GND

AC

I

X-VERTER

A

IN

RX ANT

B

RX ANT

OUT

IN

OUT

q

w

e

r

u

i

o

!0

!1

!4

!5

!7

!9

!6

!8

@0

@1

@2

@3

@4

@5

@6

@7

@8

@9

#0

#1

#2

#3

#4

!2

!3

t

y