CONFIGURATION AND SPECIFICATIONS
1-6
z DSC Watch Keeping Receiver.
Reception frequency Distress and safety frequencies of 2187.5 kHz and 8414.5 kHz, and
additionally on one or more of the 4207.5 kHz/ 6312.0 kHz/ 12577.0
kHz/ 16804.5 kHz
Receiving system Double superheterodyne
1st IF 40.04025 MHz
2nd IF 40.25 kHz
Frequency stability Within ±10 Hz
Sensitivity 1% or lower symbol error rate at reception input voltage of 1µV
Passband 6 dB bandwidth : 270 - 300 Hz
30 dB bandwidth : Within ±380 Hz
60 dB bandwidth : Within ±550 Hz
Spurious response Symbol error rate of 1% or better when an unwanted signal level of
31.6 mV is applied to a wanted signal level of 10 uv from an
intermediate frequency separated by 750 Hz or more through to a
frequency 3x the test frequency
Blocking/Desensitization Symbol error rate of 1% or better at a wanted signal level of 10 uV
and an unwanted signal level of 1 mV separated by 500 Hz
Conducted spurious emission Power emitted from antenna terminal is 2 nW or less.
Antenna impedance 50 unbalanced
z DSC Modem
Modulation rate
Within 100 baud ±30ｘ10
-6
Modulation method FSK (sub-carrier: 1700 Hz)
Mark frequency (Y) Transmission : Within 1615 Hz ±0.5 Hz
Reception (permissible value) : Within 1615 Hz ±20 Hz
Space frequency (B) Transmission : Within 1785 Hz ±0.5 Hz
Reception (permissible value) : Within 1785 Hz ±20 Hz
DSC protocol ITU-R recommendation M.493-11 (Class A and B)
DSC operation standards ITU-R recommendation M.541-9, M.821-1
DSC code 10-bit error detecting code
Message storage 20 messages for distress and 20 messages for others
z Antenna Tuner
Frequency range 1605.0 - 27500.0 kHz
Max. input power 1605.0 - 3999.9 kHz : 150Wpep
4000.0 - 27500.0 kHz : 200Wpep
SWR after tuning 2:1 or less
Tuning method Preset or auto-tuning
Tuning time Preset tuning: 0.5 sec, auto-tuning: max. 45 sec
Power supply 24 VDC (21.6 VDC to 31.2 VDC)
z Controller
Communication speed 57.6 kbps
Communication interface RS-485 and RS-232C, and Centronics compliant
Microphone input impedance 150 balanced
Standard modulation input -54 dBm
Audio output Internal loud speaker (8) : 5W max
External speaker impedance : 8 or more
Handset phone (150) : Rated 1mW or more
LCD display 3.8 inch FSTN monochrome, 320 x 240 dot, LED backlight
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