Specifications

3-98 888-2857-001 5/9/13
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
Platinum VAX-C Series
Figure 3-66 CTTB Modulator Status Screen 2
Fault Log Displays Fault Log.
Exciter Home Displays Exciter Home screen.
Status Displays Status screen.
Figure 3-67 Xmtr Home>Exciter Home>Status>CTTB Modulator>Next (screen 2)
Field Explanation
Output Bandwidth Displays RF Output bandwidth. Presently fixed at 8 MHz. Future options
are 7 MHz, 6 MHz or 5MHz.
Carriers Displays the number of RF carriers in the output signal. Present values
are Multi, Single, or Two Pilot. Multi = COFDM type modulation, Single
= single carrier modulation system, Two Pilot = single carrier modulation
mode with two pilots
Guard Interval Displays the guard interval time. Presently fixed at PN595 (1/6). Options
are PN945 (1/4), PN595 (slightly less than 1/6), or PN420 (1/9). This is
the length of the guard interval in symbols. The total frame length is 3780
symbols. Guard interval is the guard interval symbol length divided by
the total symbol length. Example: 945/3780 = 1/4
.
Guard Interval PN Displays options, which are variable or constant. Constant only used with
PN595, Variable is used with PN945 and PN420
Constellation Display choices are 4QAM, 16QAM, 32QAM, or 64QAM.
Figure 3-65 Xmtr Home>Exciter Home>Status>CTTB Modulator (screen 1)
Field Explanation