Icom IC-905 - Unique features of D-STAR; What is D-STAR?

10
D-STAR OPERATION (BASIC)
10-2
Unique features of D-STAR
• Easy Cross band operation through a repeater • Easy call sign entry with the Repeater list or TX/
RX History
• The Call Sign Capture key makes call sign
capture easy!
IMPORTANT! Before starting D-STAR, the following steps are required�
STEP 1
Enter your call sign (MY) into the transceiver� (p� 10-4)
STEP 2
Register your call sign (MY) to a gateway repeater� (p� 10-5)
STEP 3
Enter your D-STAR equipment into your registration form� (p� 10-5)
► You have completed the steps!!
What is D-STAR?
• D-STAR is a digital protocol standard developed by the Japan Amateur Radio League (JARL)� The system
includes the DV mode for Digital Voice and the DD mode for Digital Data communications�
• D-STAR supports a comprehensive repeater system linked through the Internet, enabling you to make QSOs
with stations near or far from your location�
• D-STAR supports the DV mode at 4�8 kbps� Your call sign data, and either a short message, or GPS data can be
transmitted simultaneously with your voice signal�
Advanced Amateur radio technology of D-STAR
The DV mode has a bandwidth of only 6 kHz, compared to 16 kHz for the analog FM mode, with 5 kHz deviation�
D-STAR utilizes the well-known GMSK modulation method that makes very e󰀩cient use of occupied bandwidth.
D-STAR occupies 10 kHz� The sound quality is
good, even though the bandwidth is narrow�
The regular FM mode occupies 20 kHz that is
double the bandwidth of D-STAR�
Frequency Frequency
fo
6 kHz6 kHz
fo
16 kHz16 kHz
10 kHz10 kHz
20 kHz20 kHz
10 kHz10 kHz10 kHz10 kHz
20 kHz20 kHz
10 kHz10 kHz 10 kHz10 kHz10 kHz10 kHz
20 kHz20 kHz
10 kHz10 kHz 10 kHz10 kHz
20 kHz20 kHz
D-STAR (F7W) FM (F3E)
430MHz430MHz 1200MHz1200MHz
CQCQCQCQ CQCQCQCQ
INTERNET
INTERNET