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126
SPECIFICA
TIONS
●
Transmitter Unit
Antenna output power
25W +20%, –50% 0.1 – 1W (reduced output)
Oscillation method
Frequency synthesizer
Modulation method
Frequency modulation
Maximum frequency deviation
Within
±
5kHz
Occupied bandwidth
Within
±
16kHz
Microphone input impedance
600
Ω
balanced
Standard modulation input
–53dBm
Pre emphasis characteristics
6dB/oct +1dB, –3dB
Overall distortion
10% or better
Signal-to-noise ratio
40dB or more
Spurious emission
2.5
µ
W or less
DSC modulation rate
1200 baud
±
30X10
-6
DSC modulation method
FSK
DSC modulation index
2
±
10%
Mark signal frequency (Y)
1300Hz
±
10Hz
Space signal frequency (B)
2100Hz
±
10Hz
●
Receiver Unit
Receiving system
Double superheterodyne
1st IF
21.4MHz
2nd IF
455kHz
Local oscillation frequency
Reception frequency – 21.4MHz
Local oscillation method
Frequency synthesizer
Sensitivity
2
µ
V or better (20dB NQ)
Sensitivity (DSC)
Symbol error rate at 1
µ
V is 1% or better.
Squelch sensitivity
1
µ
V or better
Selectivity
6dB bandwidth: 12kHz or more
70dB selectivity: 25kHz or less
Spurious response
80dB or more (20dB NQ)
Spurious response (DSC)
Symbol error rate is 1% or less at a wanted signal level of 3dB
µ
and
an unwanted signal level of 73dB
µ
.
Blocking
90dB
µ
or more (
±
1–10MHz), 80dB
µ
or more (20dB NQ)
Blocking (DSC)
Symbol error rate is 1% or better at a wanted signal level of 3dB
µ
and an unwanted signal level of 73dB
µ
.
Intermodulation
70dB
µ
or more (20dB NQ)
Intermodulation (DSC)
Symbol error rate is 1% or better at wanted signal level of 3dB
µ
and
an unwanted signal level of 68dB
µ
.
Overall distortion
10% or better
Signal-to-noise ratio
40dB or more
Rated audio output
2W (4
Ω
)
External speaker output level
0dBm (600
Ω
, unbalanced)
De emphasis characteristics
6dB/oct, +1dB, –3dB
Radiation
4000
µµ
W or less
DSC message files
For distress messages: 20
For other messages: 10
8.1 Main Unit (JHS-32B)
Содержание JHS-32B
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Страница 34: ...26 EQUIPMENT OVERVIEW 3 NKG 52 Printer 1 4 Dimensions Wall Mount Type Flush Mount Type...
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Страница 39: ...1 2 3 4 5 6 7 8 9 10 31 EQUIPMENT OVERVIEW 1 6 Main Unit Block Diagram 1 6 Main Unit Block Diagram...
Страница 42: ...34 EQUIPMENT OVERVIEW Terminal section 1 7 Parts Layout Diagram of Main Unit JHS 32B...
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