Figure 10-1. Conceptual Block Diagram - Comtech EF Data CDM-625 Installation And Operation Manual

Advanced satellite modem (18 kbps – 25 mbps)

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CDM-625 Advanced Satellite Modem

DoubleTalk Carrier-in-Carrier Option

This performance is achieved through advanced signal processing algorithms that provide

superior cancellation while tracking and compensating for the following common link

impairments:

1) Time varying delay: In addition to the static delays of the electronics and the round-trip

delay associated with propagation to the satellite and back, there is a time-varying

component due to movement of the satellite. The CnC module tracks and compensates

for this variation.

2) Frequency offset and drift: Common sources are satellite Doppler shift, up and down

converter frequency uncertainties, and other drift associated with the electronics in the

CDM-625 itself. The CnC module tracks and compensates for this frequency offset and

3) Atmospheric effects: Fading and scintillation can affect amplitude, phase, and spectral

composition of the signal and the degree to which it correlates with the original signal.

The CnC module tracks and compensates for these atmospheric related impairments.

Figure 10-1. Conceptual Block Diagram

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