Receiver - ComSpace Odyssey 2000 Instruction Manual

Instruction Manual
No. Parameter
1 Modulation Type
2 Output Power
3 Output Impedance
3 Harmonic Distortion
4 Microphone Impedance
5 Microphone Input
6 Frequency Stability
7 Channel Frequency spread
8 Adjacent Channel Power Ratio
9 Occupied Bandwidth
10 Transmitter Carrier Attack Time
No. Parameter
1 Modulation Type
2 Sensitivity
3 Input impedance
4 Intermediate Frequency
5 Frequency stability
6 Channel frequency
spread
7 Spurious rejection
8 Adjacent Channel
Selectivity
9 Receiver IM Margin
10 Image rejection
11 Rated Audio output
TRANSMITTER
Requirement
DC/MA®
4 Watts Pulsed Average
(Maximum)
50 Ω
-57dBc
3 kΩ
750 Ω
Initial = 0.1 PPM
Temperature = 2.5 PPM
Aging = 1 PPM/yr.
18 MHz
60 dBc
20 kHz
< 0.5 msec

RECEIVER

Requirement
DC/MA®
0.45 µV (-114 dBm)
50 Ω
VSWR < 2.5:1
st
1 IF 86.85 MHz
nd
2 IF 450 kHz
Initial = 0.1 PPM
Temperature = 2.5 PPM
Aging = 1 PPM/yr.
18 MHz
>70 dB
>70 dB
>70 dB
>70 dB
0.5 W RMS into 8 Ω (internal)
3.5 W RMS into 8 Ω (external)
Page 9 of 25
Comments
16QAM (2 level 8 phase) – Digital
Channel/Multicarrier Architecture
Two tone, third order products.
Parallel of microphone input and
microphone impedance is 600 Ω
Improved stability when synchronized to
the repeater. The repeater clock is stable
to ± 0.002 PPM.
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.
< 2 symbols with each symbol being 0.25
msec
Comments
16QAM (2 level 8 phase)
Based on 6% BER.
Improved stability when synchronized
to the repeater. The repeater clock is
stable to ± 0.002 PPM.
Adjacent-channel FM-signal rejection
measured 25 kHz from the receiver
carrier.
Intermodulation of the receiver. Based
on cellular alternate channel definition
with F at 50 kHz and F
1
from test channel.
At < 5% @ 1kHz THD
at 100 kHz
2