Bandwidth Filter Adjustment

Test Goal

Set the band width filter for each pulse width.

Test Equipment

KVM connected

Test Procedure

1. Enter the TTY setups through dspx.
2. Issue the Ps command and view the results on the display scope.
3. Toggle the space bar to show both the spectrum of the burst pulse and the spectrum of the bandwidth filter response.
4. Use the Z/z command to zoom the burst spectrum plot to approximately match the height of the bandwidth filter response (which have a smoother shape than the burst pulse).
5. Use the Ww/Nn commands to adjust the width of the bandwidth filter plot to be slightly narrower than the burst pulse. Then use the w/n commands to fine tune the filter width such that the DC–Gain: is either ZERO or less than -66 dB.
6. Repeat for each pulse width that is used (use the Mt command to change pulse width) and record:

   Pulse width #	FIRLength	Bandwidth	DC Gain
   0	________ μsec	________ MHz	________ dBm
   1	________ μsec	________ MHz	________ dBm
   2	________ μsec	________ MHz	________ dBm
   3	________ μsec	________ MHz	________ dBm

Checklist