Advanced Connections; Fsk And Afsk Connections - Icom IC-705 Advanced Manual

18� ADVANCED CONNECTIONS

FSK and AFSK connections

The transceiver has a mode key for RTTY. You can use a PC and an application software to operate
RTTY using a USB cable. See the interface circuit diagram below for details.
Refer to the software application's instruction manual for setup details.
( Icom does not guarantee the performance of the application software, PC, network device, or network
settings.)
When using the microUSB port
PC
TIP:
• To operate RTTY through your PC's USB port, set the following item.
» SET > Connectors > USB SEND/Keying
• Download the USB driver and the installation guide from the Icom website.
https://www�icomjapan�com/support/
When using the [SP] jack, [MIC] jack, and [SEND/ALC] jack
A B
3.5 mm (1/8 inch)
Connecting to [SP]
CD
2.5 mm
Connecting to [MIC]
E F
3.5 mm (1/8 inch)
Connecting to ［SEND/ALC］
TIP: We recommend using the SEND terminal on the [SEND] jack to change receiving and transmitting.
If you use the PTT terminal on the [MIC] jack, the data may be cut off.
To a USB port
A
Shield cable
B
C
Shield cable
D
E
F ★1
E C B
4.7kΩ
★1: NPN transistor
(2SC1815)
USB cable
To the [microUSB] port
Interface circuit example for digital modes (User supplied)
2kΩ：2kΩ 10kΩ
Shield cable
10kΩ
(Trimpot)
Shield cable
2kΩ：2kΩ
10kΩ
10kΩ
(Trimpot)
Shield cable
D-Sub25
★2
RTS
Pin 4
GND
Pin 7
★2: Switching diode
(1S1588)
18-1
Connect to
LINE IN or
MIC IN
No connection
Connect to
SP OUT
No connection
D-Sub9
Pin 7
Pin 5
Connect to
COM port
PC