JRC JHS-770S -, Instruction Manual

Page: 145 / 162

Specifications
9-3
● CH70 Watch Keeping Receiver
Receiving frequency 156.525MHz (CH70)
Receiving system Double superheterodyne
1st IF 58.1MHz
2nd IF 455kHz
Local oscillation frequency Receiving fre 58.1MHz
Local oscillation method Frequency synthesizer
Local oscillation frequency variance ±10 x 10
-6
or less
Sensitivity 1% or lower symbol error rate at 0dB μ V
Selectivity 6dB bandwidth: 12kHz or more, 70dB selectivity: 25kHz or less
De-emphasis characteristics 6dB/oct, 1dB, -3dB
Co-channel selectivity
Symbol error rate of 1% or better at a wanted signal level of 3dB μ V
and an unwanted signal level of -5dB μ V
Adjacent channel selectivity
Symbol error rate of 1% or better at a wanted signal level of 3dB μ V
and an unwanted signal level of 73dB μ V
Desensitization effect
Symbol error rate of 1% or better at a wanted signal level of 3dB μ V
and an unwanted signal level of 73dB μ V
Spurious response
Symbol error rate of 1% or better at a wanted signal level of 3dB μ V
and an unwanted signal level of 73dB μ V
Intermodulation characteristics
Symbol error rate of 1% or better at a wanted signal level of 3dB μ V
and an unwanted signal level of 68dB μ V
Blocking characteristics
Symbol error rate of 1% or better at a wanted signal level of 3dB μ V
and an unwanted signal level of 93dB μ V
Radiation 9kHz - 2GHz: 2nW or less
●
DSC/ATIS Modem
Modulation rate
1200baud ±30 ｘ 10
-6
or less
Modulation method FSK
Modulation index
DSC: 2.0 ±10% or less
ATIS: 1.0 ±10% or less
Mark frequency (Y) 1300Hz ±10Hz or less
Space frequency (B) 2100Hz ±10Hz or less
DSC protocol ITU-R Recommendation M.493-11 (Class A)
DSC operation standards ITU-R Recommendation M.541-9, M.689-2, M.821-1, M.1080-0
ATIS protocol, operation standards EN 300 698-1 V1.3.1
●
Controller
Communication speed 9600bps or 57.6kbps
Communication interface RS-485 and RS-232C
Microphone input impedance 150 Ω balanced
Standard modulation input -54dBm
Rated audio output
Internal speaker (4 Ω ): 2W or more
Handset phone (150 Ω ): 1mW or more
LCD display 3.8 inch FSTN monochrome, 320 x 240 dot, LED backlight