Icom IC-9700 Instruction Manual advanced - Page 89

D-STAR OPERATION (BASIC), Unique features of D-STAR, What is D-STAR?

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9. D-STAR OPERATION (BASIC) Unique features of D-STAR •• Easy Cross band operation through the repeater •• The Call Sign Capture key TONE RX→CS makes call sign capture easy! 430 MHz CQCQ Internet 1200 MHz CQCQ •• Easy call sign entry with the Repeater list or TX/RX History 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-know GMSK modulation method that makes very efficient use of occupied bandwidth. D-STAR (F7W) FM (F3E) 10 kHz fo 6 kHz Frequency 10 kHz 10 kHz 10 kHz 10 kHz fo 16 kHz 10 kHz 10 kHz Frequency 10 kHz 20 kHz 20 kHz D-STAR occupies 10 kHz. The sound quality is good even though the bandwidth is narrow. 20 kHz 20 kHz The regular FM mode occupies 20 kHz that is a double the bandwidth of D-STAR. 9-1

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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 MHz
430 MHz
1200 MHz
1200 MHz
CQCQ
CQCQ
CQCQ
CQCQ
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 efficient use of occupied bandwidth.
Frequency
Frequency
fo
6 kHz
6 kHz
fo
16 kHz
16 kHz
10 kHz
10 kHz
20 kHz
20 kHz
10 kHz
10 kHz
10 kHz
10 kHz
20 kHz
20 kHz
10 kHz
10 kHz
10 kHz
10 kHz
10 kHz
10 kHz
20 kHz
20 kHz
10 kHz
10 kHz
10 kHz
10 kHz
20 kHz
20 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.