Spurious Using A Spectrum Analyzer; Output Frequency; Figure 5-7. Offset Test Mode - Comtech EF Data SLM-7650 Installation And Operation Manual

SLM-7650 Satellite Modem
Maintenance
5.3.1.3

Spurious using a Spectrum Analyzer

1. Continue from the previous step and change the Spectrum Analyzer frequency span
to cover the frequency range of 0 to 500 MHz.
2. Verify there are no spurious signals above the specified level.
5.3.1.4

Output Frequency

1. Continue from the previous step and in the Configuration -Modulator menu, set the
Carrier Mode to CENTER (Figure 5-8).
2. Connect the IF output to a Frequency Counter that is referenced to the same
frequency reference that is connected to the modulator.
3. Verify that the output frequency of the modulator is within the tolerance listed in the
specification.
4. Set the Carrier Mode to Normal-Modulated.
5. Turn the TX-IF Output ON.

Figure 5-7. OFFSET Test Mode

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