17
11) Image interference ratio: more than 70dB
12) Intermediate frequency interference ratio: more than 80dB
13) SPURIOUS RESPONSE: more than 70dB
In case of DSC, NBDP when a wanted signal of 10
㎶
and a 31.6
㎷
unwanted
signal(excluding the range within 750Hz of the wanted signal) whose range of IF it's
three times that of the wanted signal, the symbol error rate is less than 1 x 10-2.
14) Selectivity suppression: With a wanted signal of 10
㎶
and an unwanted signal that is
effect than 3kHz from the wanted signal, an unwanted signal input voltage of 10m
suppresses the wanted scanning output to 3db.In case of DSC, NBDP with a wanted
signal of 10
㎶
and 1
㎷
unwanted signal 500hz from the wanted signal, the character
error rate is less than 1 x 10
-2
.
15) Secondary emission: The power emitted from antenna terminal is less than 4000
㎼
.
16) Nominal input load: 50 ohm unbalanced
3-4
DSC (DIGITAL SELECTIVE CALL) W/K RECEIVER
1) Type of emission: F1B.
2) Frequency: 2187.5, 4207.5, 6312, 8414.5, 12577, 16804.5 kHz
3) Frequency stability: w
ithin ± 10Hz
4) Scanning reception of above frequencies is continued up to 2sec for each frequency
and stop only when detects a 100 baud dot pattern.
5) Receiving sensitivity: character error rate is less than 1 x 10
-2
at receiver input voltage
1
㎶
.
6) 1 signal selectivity: 6dB Bandwidth 270 ~ 300Hz
30dB Bandwidth within
± 380Hz
60dB Bandwidth within
± 550Hz
7) Nominal input load: 50 ohm unbalanced
8) DSC Receiving character display: Maximum 256 characters (numbers and letters)
9) SPURIOUS RESPONSE:
With a wanted signal of 10
㎶
and 31.6
㎷
zero modulated interference signal which
excludes the range within 750hz of the wanted signal, the character error rate is less than
1 x 10
-2
.
10) The power emitted from antenna terminal is less than 4000
㎼
.
3-5
MF/HF CONTROL
