Icom IC-9700 - D-Star Operation (Basic); Unique Features of D-STAR; What Is D-STAR

9. D-STAR OPERATION (BASIC)
9-1
Unique features of D-STAR
What is D-STAR?
• Easy Cross band operation through the
repeater
• Easy call sign entry with the Repeater list or
TX/RX History
• The Call Sign Capture key
TONE
RX
→
CS
makes call
sign capture easy!
430 MHz430 MHz 1200 MHz1200 MHz
CQCQCQCQ CQCQCQCQ
Internet
Internet
• 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-know GMSK modulation method that makes very efcient use of occupied bandwidth.
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)
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 a
double the bandwidth of D-STAR.