PDS_VERSION_ID         = PDS3                                                 
RECORD_TYPE            = STREAM                                               
OBJECT                 = TEXT                                                 
  PUBLICATION_DATE     = 2005-06-01                                           
  NOTE                 = "                                                    
      C40_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                      EX, BZ              32 seconds      
WFR      1 - 25 Hz                        EX,EW,LP(+4V),BY,BZ 320 seconds     
WFR      .1 - 2.5 KHz                     EX,EW,LP(+4V),BY,BZ 320 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               640 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     16     n  1000   1              3.6-319 kHz          
H1   2E   y        y      2     n  20     1   60    25   325k-1.8MHz          
H2   1E   n        n      1     n  10     1   72    200  1.8M-16MHz           
                                                                              
Bands ABC require 3.16 sec to complete, H1 requires 1.57 sec, and H2 requires 
0.65 sec for a total of 5.62 sec per sweep. However, the time between         
analyses is set to 10 seconds to avoid interference from the LP sweep.        
                                                                              
No Sounder measurements are made in this mode. No onboard dust detection is   
done either.