Modulator Power Offset; Modulator I / Q Imbalance; Modulator Output Noise Floor; Modulator Spectrum Rotation - Comtech EF Data SNM-1001L Installation And Operation Manual

SNM-1001L Satellite Modem
Specifications
A.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.
A.5.17

Modulator I / Q Imbalance

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A.5.18

Modulator Output Noise Floor

The Modulator Output Noise Floor shall be -130dBc/Hz (20 MHz from carrier).
A.5.19

Modulator Spectrum Rotation

The operator can select Normal or Inverted spectrum of the Modulator Output.
A.5.20

Modulator Output Return Loss

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•
A.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.
A.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.)
A.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.
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•
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The modulator will have less than 4° RMS phase error.
The modulator will have less than 0.25 dB amplitude imbalance
Carrier Frequency < 1350 MHz: > 14dB at 50Ω 950 to 1350 MHz
Carrier Frequency > 1350 MHz: > 14dB at 50Ω 1350 to 1750 MHz
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
A–10
Revision 1
MN/SNM1001L.IOM
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