Comtech EF Data SDM-650B - Manual (Page 144)

Theory of Operation SDM-650B Satellite Modem
5–20 Rev. 6
5.4.3 Directed Sweep
The directed sweep mode was designed to rapidly acquire a carrier of known frequency
offset.
If the customer knows where the carrier is going to be, the directed sweep mode can be
much faster than the fast acquisition mode. Due to the reduced speed of the lower data
rates (up to 30 seconds in fast acquisition), the customer has the option of controlling the
sweep functions.
There are four additional functions in the front panel menu that are directly related to the
directed sweep mode:
• Monitor function, SWP_FREQ, that detects the current sweep frequency.
• Three functions in the Config menu that are specifically for the directed sweep
mode:
Š Sweep Center
Š Sweep Range
Š Sweep Direction
These functions will only be displayed in the front panel menu when the fast acquisition
function has been turned ON in the Utility menu. Refer to Chapter 4 for further details of
the directed sweep functions.