PDS_VERSION_ID         = PDS3                                                 
RECORD_TYPE            = STREAM                                               
OBJECT                 = TEXT                                                 
  PUBLICATION_DATE     = 2005-11-29                                           
  NOTE                 = "                                                    
      S13_TRIG_BE.TXT describes the RPWS instrument configuration for         
      the High Frequency Receiver (HFR), the Medium Frequency Receiver (MFR), 
      the Low Frequency Receiver (LFR), the Waveform Receiver (WFR),          
      the Wideband Receiver (WBR), the Langmuir Probe (LP), the Sounder,      
      and the onboard Dust detection algorithm when using Trigger BE."        
END_OBJECT           = TEXT                                                   
END                                                                           
                                                                              
                                                                              
Trigger BE Description                                                        
                                                                              
Sequence: C40, ...                                                            
                                                                              
Trigger BE ( Titan millisecond mode)                                          
                                                                              
This mode assumes a that either Nighttime survey 8E or SEDDF mode A0, is      
running.  The HFR runs in millisecond mode for approximately 56 seconds of    
every 64-second interval, and then performs one normal analysis using fast    
time constants. The millisecond mode frequency is changed every 64 seconds,   
stepping from 775 KHz to 1525 KHz, and finally to 3025 KHz. The WFR is run in 
the usual 5-channel mode, except that its 3rd channel, normally connected to  
BX, is now connected to the Langmuir Probe sphere, which is set to a fixed    
bias of +4V. The LP performs a sweep every 640 seconds, and between sweeps    
does a fixed bias (+4V) density mode measurement every 16 seconds.            
                                                                              
The WBR acquires data in 80-KHz mode.                                         
Sounder is disabled, and dust detection is disabled in this mode.             
The target bit rate is 100 kbps. In C40 the measured bitrate was 99 kbps.     
There was an error in the C40 test --- because the preceding mode was         
normal survey (8A) instead of the recommended 8E or A0, the HFR performed     
its normal analysis every 72 seconds instead of the planned 64 seconds.       
                                                                              
Receiver Frequency Range                  Sensors             Cycle Time      
-------- -------------------------------- ------------------- ------------    
MFR      25 - 12 KHz                      EW, BZ              32 seconds      
WFR      1 - 25 Hz                        EX,EW,LP(+4V),BY,BZ 48 seconds      
WFR      .1 - 2.5 KHz                     EX,EW,LP(+4V),BY,BZ 48 seconds      
HFR      3.6 KHz - 16 MHz                 EX, EW              64 seconds      
HFR      msec mode at 775, 1525, 3025 KHz EX                  2.5 seconds     
LP       N/A                              Probe               48 seconds      
WBR      0 - 80 KHz                       EX                  0.125 second    
                                                                              
The HFR is in a modified "Composite Survey" mode, which includes              
both auto- and cross-correlations for H1, and should be set up                
to use the faster integration constants of the "Night-time" survey            
mode, running either trigger 8E or A0 or A8 prior to this trigger.            
This mode is defined by:                                                      
                                                                              
          Correlations Channels    Integ.            Size Frequency           
Band Ant. Auto- Cross- per Band df Period  Rep Steps kHz  Start - Stop        
---- ---- ----- ------ -------- -- ------  --- ----- ---- ------------        
ABC   2E    y      y      32    n    500    1              3.6-319kHz         
H1    2E    y      y       2    n     40    1    60    25  0.325k-1.825MHz    
H2    1E    n      n       1    n     40    1    72   200  1.825M-16.225MHz   
                                                                              
Bands ABC require 1.560 sec to complete, H1 requires 2.852 sec, and           
H2 requires 2.534 sec for a total of 6.946 sec per sweep.  The hfr            
cycle time is 64.000 seconds.                                                 
                                                                              
No Sounder measurements are made in this mode. No onboard dust detection is   
done either.