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Real-Time I/Q Baseband Generator User’s and Programming Guide
3-93
ESG Family Signal Generators
Softkey Reference
Options UN8 and 202
F
Filter
Press this softkey to access menus where you can:
• Select a filter type
• Restore the default filter
• Define a unique FIR filter
• Adjust filter alpha (for Nyquist or Root Nyquist filters)
• Adjust bandwidth time product (for Gaussian filters)
• Optimize the filter for the best EVM or ACP
Softkey Locations
Custom:
Mode
>
Custom
>
Filter
Other Formats:
Mode
>
TDMA
>
desired format
>
Modify Standard
>
Filter
Filter Alpha
Press this softkey to make the FIR filter’s alpha parameter in either the
Filter menu or the Load Default FIR menu the active function.
In the Filter Menu
In this menu, the
Filter Alpha
softkey changes the alpha parameter of
the selected Root Nyquist or Nyquist filter. To enter a new value, rotate
the front-panel knob until the desired value is displayed, use the up
and down arrow keys, or enter the value using the numeric keypad and
press the
Enter
terminator softkey.
This key appears only after choosing a Root Nyquist or Nyquist filter. If
a Gaussian filter is in use, you will see
Filter BbT
. If any other filter is in
use, this key is replaced with a grayed-out key labeled
Filter Factor N/A
.
Range: 0.000 through 1.000
Default Values
Custom, NADC, TETRA: 0.350
Other Formats: 0.500
Softkey Locations
Custom:
Mode
>
Custom
>
Filter
>
Select
>
Root Nyquist
(or
Nyquist)
>
Filter Alpha
Other Formats:
Mode
>
TDMA
>
desired format
>
Modify Standard
>
Filter
>
Select
>
Root Nyquist
(or
Nyquist
) >
Filter Alpha
In the Load Default FIR Menu
In this menu, the
Filter Alpha
softkey changes the alpha parameter of
the Root Nyquist or Nyquist filter coefficients loaded into the FIR table
editor. After entering the alpha value, press
Generate
to modify the filter
coefficients in the table editor.
Содержание ESG series
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