Comtech EF Data SDM-300L3 - Manual (Page 318)

SDM-300L3 Satellite Modem Revision 0
Specifications MN/SDM300L3.IOM
14–12
14.5.16 Modulator Power Offset
An offset to the displayed IF output power may be entered from -99.0 to +99.0 dB, in
0.1 dB steps.
14.5.17 Modulator I / Q Imbalance
• The modulator will have less than 4 ° RMS phase error.
• The modulator will have less than 0.25 dB amplitude imbalance .
14.5.18 Modulator Output Noise Floor
The Modulator Output Noise Floor shall be -130dBc/Hz (20 MHz from carrier).
14.5.19 Modulator Spectrum Rotation
The operator can select Normal or Inverted spectrum of the Modulator Output.
14.5.20 Modulator Output Return Loss
• Carrier Frequency < 1350 MHz: > 14dB at 50 Ω 950 to 1350 MHz
• Carrier Frequency > 1350 MHz: > 14dB at 50 Ω 1350 to 1750 MHz
14.5.21 L-Band ODU Reference Signal
The IDU shall provide a synthesizer reference on the center conductor of the
L-Band output connector. The signal will be 10 MHz with a stability of
± 0.02 ppm.
at 0.0 dBm, ± 3 dB.
14.5.22 L-Band ODU Control and Monitor
The IDU shall provide an FSK signal for monitor and control of the SierraCom or Herley
BUC. (Refer to Chapter 16.)
14.5.23 Modulator Transmit IF Test Modes
The following TX IF test modes are available to the operator. Spurious emissions in the
following test modes will be
≤ -30 dBc.
• CW: Outputs a single carrier at the defined frequency
• Offset: Single sideband signal with one sideband suppressed ≤ -25 dBc and carrier
suppressed ≤ -35 dBc (harmonics of modulation rate are present).
• Dual sideband: Suppressed carrier ≤ -35 dBc