Fsk And Afsk (Sstv) Connections - Icom iC-7850 Instruction Manual

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3
INSTALLATION AND CONNECTIONS

■ FSK and AFSK (SSTV) connections

The transceiver has a Modem function for RTTY and
PSK. However, if you want to use a PC to operate
these digital modes, it is necessary to prepare the fol-
lowing interface circuit, or use a similar 3rd party de-
vice.
Refer to the instruction manual for the device prior to
connecting it.
(1) When using the USB port
Set a USB condition on the "USB keying (RTTY)" set-
ting when operating RTTY.
(2) When using the ACC socket or the microphone connector
¡When connecting to [ACC1]
ACC1
E
D
D
C
C
E
B
A
B
(Rear panel view)
A
¡When connecting to [MIC]
D
E
F
1
7
C
2 6
8
B
3 5
4
(Front panel view)
NOTE:
You cannot operate RTTY
(FSK) operation when you
connect the circuit to the
microphone connector.
(p. 15-19)
2 k˘ 2 k˘
Shield cable
2 k˘ 2 k˘
*3
*1
E C B
4.7 k˘
*1
E C B
4.7 k˘
*1 NPN transistor *2 switching diode
(2SC1815) (1S1588)
The sections shown in squares are required
only when Baudot RTTY is used in FSK (RTTY) mode.
(Other digital mode operations such as SSTV or PSK are not required.)
[USB B] port
USB cable (Purchase separately)
Example interface circuit for digital modes
(Not provided by Icom)
10 k˘ Shield cable
10 k˘
(Trimpot)
Shield cable
10 k˘
10 k˘
(Trimpot)
Shield cable
D-Sub25
D-Sub9
*2
RTS
Pin 4 Pin 7
GND
Pin 7 Pin 5
*2
TXD
Pin 2 Pin 3
Shield cable
*3 Connect to [C] when using ACC1.
Connect to [F] when using the microphone connector.
3-8
PC
To USB port
Connection to
LINE IN or MIC
IN of PC
No connection
Connection to
SP OUT of PC
No connection
Connection to
COM port of PC
PC