PDS_VERSION_ID         = PDS3                                                 
RECORD_TYPE            = STREAM                                               
OBJECT                 = TEXT                                                 
  PUBLICATION_DATE     = 2005-05-31                                           
  NOTE                 = "                                                    
      C32_TRIG_2A.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 2A."        
END_OBJECT           = TEXT                                                   
END                                                                           
                                                                              
                                                                              
Trigger 2A Description                                                        
                                                                              
Sequence: C30, C31                                                            
Trigger 2A (Interplanetary Cruise mode with very low bitrate)                 
                                                                              
     This mode is designed to provide an extremely low bit-rate Survey with   
low temporal and spectral resolution for periods during cruise when the       
telemetry allocation is not sufficient to perform the 200-bps Trigger-28      
mode. The bitrate for this mode is 130 to 140 bps, and is achieved by         
reducing the HFR duty cycle to every 64 seconds. Other than this              
modification, this mode is identical to Trigger-28.                           
                                                                              
No Wideband or Waveform measurements are made. The entire RPWS frequency      
range (1 Hz - 16 MHz) is covered. Starting in C29, the 3-axis                 
direction-finding mode was removed from the HFR and instead, the sensor was   
changed to the dipole to increase sensitivity in an effort to detect Saturn   
emissions.                                                                    
                                                                              
Receiver      Frequency Range       Sensors       Time between Snapshots      
--------      ----------------      -------       ----------------------      
  LFR          1 - 25 Hz            EX, BX        32 seconds                  
  MFR         25 - 12 KHz           EX, BZ        32 seconds                  
  HFR       3.6 KHz - 16 MHz        EX, EW        64 seconds                  
  LP               N/A              LP            8128 seconds                
                                                                              
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      1     n  160    1   18    100  325k-2.0MHz          
H2   2E   y        y      1     n  80     1   71    200  2.0M-16MHz           
                                                                              
Bands ABC require 3.16 sec to complete, H1 requires 3.16 sec, and H2 requires 
6.00 sec for a total of 12.32 sec per sweep. However, to keep the bit rate    
down the HFR only performs one complete sweep every 64 seconds.               
                                                                              
Starting in C26, dust detection using the EZ sensor was added, and            
also periodic Langmuir Probe sweeps every 8128 seconds.