Comtech EF Data SDM-300L User Manual
Page 17
Introduction
SDM-300L Satellite Modem
1–6
Rev.
2
Table 1-3. General Specifications (Continued)
Modulation Specification
Parameter
70/140 MHz
L-Band Option
Output Frequency
50 to 90 and 100 to 180 MHz
in 1 Hz steps
950 to 1750 MHz
in 100 Hz steps
Output Power
+5 to –20 dBm in 0.1 dB steps
0 to –30 dBm in 0.5 dB steps,
with
±
2.5 dB accuracy
Output Stability
±
0.5 dB
±
0.5 dB
Output Spurious in 4 kHz Band
(measured with modulated carrier)
< -50 dBc, 20 to 500 MHz
> 64 kbit/s
< -45 dBc, 20 to 500MHz
≤
64 kbit/s
< –50 dBc, 55 to 2000 MHz
Output Phase Noise
< -66 dBc/Hz at 100Hz
< -76 dBc/Hz at 1 kHz
< -86 dBc/Hz at 10 kHz
< -96 dBc/Hz at 100 kHz
< -96 dBc/Hz at 1 MHz
< -63 dBc/Hz at 100 Hz
< -73 dBc/Hz at 1 kHz
< -83 dBc/Hz at 10 MHz
< -93 dBc/Hz at 100 kHz
Output Impedance, Return Loss
75
Ω
≥
20 dB
50
Ω
≥
15 dB
Output Spectrum
IESS-308/-309, EFD Closed
IESS-308/-309, EFD Closed
Data Clock Source
Internal or External
Internal or External
Internal Stability
±
10 ppm
±
0.02 ppm
Output Connector
BNC, Female
Type N, Female
Outdoor Reference (center conductor of
IF Output connector)
Not Applicable
On or Off
10 MHz
±
0.02 ppm at
0
±
3 dBm
Outdoor Unit (ODU) DC Voltage
(From IF output connector)
Not Applicable
On or Off (with optional ODU
voltage)
Demodulation Specification
Input Frequency
950 to 1750 MHz in 100 Hz steps
Minimum Input Power (Desired
Carrier)
+10 log (symbol rate) – 135 dBm
AGC Range
50 dB above minimum input level
Composite to Desired Carrier
+40 dBc,
≥
64 ksym/s
+50 dBc, < 64 ksym/s
Maximum Composite Level
–5 dBm
Input Impedance, Return Loss
75
Ω
≥
10 dB
Input Connector
Type N, Female
Carrier Acquisition Range
±
75 kHz in 1 Hz steps
Acquisition Time
<1 second at 64 kbit/s 1/2 rate
Sweep Reacquisition
0 to 999 seconds, in 1 second steps
Buffer Clock
Internal, External, Transmit, Recovered RX
LNB Voltage
On or Off
+13 and +18 VDC per DiSEqC 4.2 and + 24VDC at 500 mA
maximum
LNB Reference (Center Conductor or
IF Input Connector)
On or Off
10 MHz
±
0.02 ppm at – 6 to +0 dBm