User Manual

Application for Certification Page 72 of 89
Work order: 2000459 / QRTL00-368
ComSpace Corporation Model:CDVSL411SAV00 FCC ID: PCKCDVSL411SAV001
TRANSMITTER
No
.
Parameter Requirement Comments
1 Modulation Type DC/MA® 16QAM (2 level 8 phase) – Digital
Channel/Multicarrier Architecture
2 Output Power 4 Watts Pulsed Average
(Maximum)
3 Output Impedance
50 Ω
3 Harmonic Distortion -57dBc Two tone, third order products.
4 Microphone Impedance
3 kΩ
5 Microphone Input
750 Ω
Parallel of microphone input and
microphone impedance is 600 Ω
6 Frequency Stability Initial = 0.1 PPM
Temperature = 2.5 PPM
Aging = 1 PPM/yr.
Improved stability when synchronized
to the repeater. The repeater clock is
stable to ± 0.002 PPM.
7 Channel Frequency spread 18 MHz
8 Adjacent Channel Power
Ratio
60 dBc
9 Occupied Bandwidth 20 kHz An 800 MHz, 25 kHz DC/MA®
channel is divided into four sub-
channels with channel offsets of
±2400 Hz and ±7200 Hz. Each of the
individual sub-channels is about 4
kHz.
10 Transmitter Carrier Attack
Time
< 0.5 msec < 2 symbols with each symbol being
0.25 msec
RECEIVER
No
.
Parameter Requirement Comments
1 Modulation Type DC/MA® 16QAM (2 level 8 phase)
2 Sensitivity
0.45 µV (-114 dBm)
Based on 6% BER.
3 Input impedance
50 Ω
VSWR < 2.5:1
4 Intermediate
Frequency
1
st
IF 86.85 MHz
2
nd
IF 450 kHz
5 Frequency stability Initial = 0.1 PPM
Temperature = 2.5 PPM
Aging = 1 PPM/yr.
Improved stability when
synchronized to the repeater. The
repeater clock is stable to ± 0.002
PPM.
6 Channel frequency
spread
18 MHz
7 Spurious rejection >70 dB
8 Adjacent Channel
Selectivity
>70 dB Adjacent-channel FM-signal
rejection measured 25 kHz from
the receiver carrier.