Scientific Atlanta D9225 manual SymbolB ratelow high- display, «$ERXWFKDQJLQJWKH6\PERO5DWH

Figure7A.DownlinkBfrequencylowandhigh-resolutiondisplay Figure10A .LocalB Oscillatorfrequencylowandhigh-resolutiondisplay

For high resolution (B), pressing the left Õor right Œarrow button displays the four least significant digits (i.e., 5225). At high resolution (decimal point flashes ON and OFF), pressing the up œor down –arrow button advances the frequency up or down in 250 kHz steps (i.e., 5250, 5275, and so on). Pressing and holding down the up œor down –arrow button will increase the step size further.

L-Band frequency: (see Figure 8) For example; if a current L-Band frequency is 1502.25 MHz, changing to Alt-1 Mode (ALT LED flashes) and pressing 4 (to dis- play Lb1 or Lb2), and then pressing 7 displays the four most significant digits on

increase the step size further.

the front panel (i.e., 1502.). At low resolution (A), pressing the up œor down – arrowFigure8button.L-Bandadvancesfrequencythelowfrequencyandhigh-resolutionup or downdisplayin 1 MHz steps (i.e., 1503., 1504., and so on). Pressing and hol ing down he up œor down –arrow button will

A

For high resolution (B), pressing the left Õor right Œarrow button displays the four least significant digits (i.e., 02.25). At high resolution (decimal point flashes ON and OFF), pressing the up œor down –arrow button advances the frequency up or down in 250 kHz steps (i.e., 02.50, 02.75 and so on). Pressing and holding down the up œor down –arrow button will increase the step size further.

Local Oscillator frequency: (see Figure 10) For example; if a current Local Oscil- lator frequency is 10.750 GHz, changing to Alt-2 Mode (ALT LED is on) and then pressing￿￿ 2 displays the four most significant digits on the front panel (i.e., 10.75). At low resolution (A), pressing the up œor down –arrow button advances the frequency up or down in 10 MHz steps (i.e., 10.76, 10.77, and so on). Pressing and holding down the up œor down –arrow button will increase the step size fur- ther.

For high resolution (B), pressing the left Õor right Œarrow button displays the four least significant digits (i.e., 0.750). At high resolution (decimal point flashes ON and OFF), pressing the up œor down –arrow button advances the frequency up or down in 1 MHz steps (i.e., 0.751, 0.752, and so on). Pressing and holding down the up œor down –arrow button will increase the step size further.

Crossover frequency: Because the Crossover and LO frequency ranges are similar, refer to the above example for changing the Crossover frequency using the high and low resolution front panel display (see Figure 10).

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The example that follows is provided to help explain how the Symbol Rate setting can be changed by switching from lower to higher resolution at the front panel display. The (default) lower resolution (i.e., four most significant digits) changes the value up or down in larger steps for making coarse adjustments. When se- lected, the higher resolution (i.e., four least significant digits) changes the value up or down in smaller steps for making fine adjustments You can use the left Õor right Œarrow button to change from low to high resolution display. When dis- playing high resolution (i.e., least significant digits), the decimal point appearing after the least significant digit flashes ON and OFF repeatedly.

Symbol Rate: (see Figure 9) For example; if the current Symbol Rate is 28.3465 Msymbols/s, changing to Alt-1 Mode (ALT LED flashes) and then pressing 5 dis- plays the four most significant digits on the front panel (i.e., 28.34). At low resolu-

down the up œor do –arrow but on will increase the step size further.

tion (A), pressing the upandœor downresolution–arrow button advances the Symbol Rate up or down in 10 Kbit/s steps (i. ., 28.35, 28.36, and so on). Pressing and holding

Figure9A.SymbolB ratelow high- display