ICOM IC-703 Manuale Utente

8

1

PANEL DESCRIPTION

DDATA socket

DACC socket

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Rear panel view

q brown i gray

w red

o white

e orange !0 black

r yellow !1 pink

t green !2 light

blue

y blue

u purple !3 light

green

1

8 V

Regulated 8 V output.

Output voltage

: 8 V ±0.3 V

Output current

: Less than 10 mA

2

GND

Connects to ground.

———

Input/output pin. 

(HF/50 MHz only)

Ground level

: –0.5 V to 0.8 V

3

HSEND Goes to ground when transmitting.

Output current

: Less than 20 mA

When grounded, transmits.

Input current (Tx)

: Less than 200 mA

4

BDT

Data line for the optional AT-180.

———

5

BAND

Band voltage output.

Output voltage

: 0 to 8.0 V

(Varies with amateur band)

6

ALC

ALC voltage input.

Control voltage

: –4 V to 0 V

Input impedance

: More than 10 k

Ω

7

NC

———

———

8

13.8 V 13.8 V output when power is ON.

Output current

: Max. 1 A

9

TKEY Key line for the optional AT-180.

———

“High” level

: More than 2.4 V

10

FSKK Controls RTTY keying

“Low” level

: Less than 0.6 V

Output current

: Less than 2 mA

11

MOD

Modulator input.

Input impedance

: 10 k

Ω

Connects to a modulator.

Input level

: Approx. 100 mV rms

AF detector output.

Output impedance : 4.7 k

Ω

12

AF

Fixed, regardless of [AF] position in

Output level

: 100–300 mV rms

default settings.

13

SQLS

Squelch output.

SQL open

: Less than 0.3 V/5 mA

Goes to ground when squelch opens.

SQL closed

: More than 6.0 V/100 µA

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Rear panel view

1

DATA IN

Input terminal for data transmit. (1200 bps: AFSK/9600 bps: G3RUH, GMSK)

2

GND

Common ground for DATA IN, DATA OUT and AF OUT.

3

PTT P

PTT terminal for packet operation. Connect ground to transmit data.

4

DATA OUT Data out terminal for 9600 bps operation only.

5

AF OUT

Data out terminal for 1200 bps operation only.

Squelch out terminal. Becomes ground level when the transceiver receives a signal
which opens the squelch.

6

SQ

• To avoid unnecessary TNC transmission, connect squelch to the TNC to inhibit trans-

mission when receiving signals.

• Keep audio output at a normal level, otherwise a “SQ” signal will not be output.

Color refers to the cable strands of the supplied cable.

ACC 1

ACC 2

q FSKK

t AF

w GND

y SQLS

e HSEND u 13.8 V
r MOD

i ALC

q 8 V

t ALC

w GND

y VSEND

e HSEND u 13.8 V
r BAND

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5

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Connect to ACC socket

• When connecting the ACC conversion cable (OPC-599)