PDS_VERSION_ID         = PDS3                                                 
RECORD_TYPE            = STREAM                                               
OBJECT                 = TEXT                                                 
  PUBLICATION_DATE     = 2005-05-31                                           
  NOTE                 = "                                                    
      C32_TRIG_92.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 92."        
END_OBJECT           = TEXT                                                   
END                                                                           
                                                                              
                                                                              
Trigger 92 Description                                                        
                                                                              
Sequence: C27                                                                 
                                                                              
Trigger 92 ( Aurora/SKR Mode, inside source region )                          
                                                                              
This mode is designed to provide a survey mode with DF-2 (direction-finding   
with 2 antennas), and additionally provide high frequency & time resolution   
for a narrow band in the SKR frequency region to resolve fine structure.      
                                                                              
Both low and high frequency WFR measurements are made. In high-frequency      
mode, there are 512 samples taken for the EX and EW antennas. These           
channels are also analyzed onboard using the LFDR FFT software, and the       
LFDR data is provided in addition to the waveform data. In low-frequency      
mode, 5-channel 2048-sample WFR measurements are made every 32 seconds.       
                                                                              
Langmuir Probe sweeps are performed every 32 seconds; density measurements    
are made at a 100-Hz sampling rate to match the Low-Frequency WFR             
measurements.  A simple up-going ramp sweep is performed; with a future       
software update, this will become a down-going voltage ramp.                  
                                                                              
A Sounder measurement is scheduled every 5 minutes.                           
                                                                              
Receiver  Frequency Range   Sensors         Time between Snapshots            
--------  ----------------  --------------  ----------------------            
LFR       0.1 - 2.5 KHz     EX, EW          160 seconds                       
MFR       25 - 12 KHz       EX, BZ          32 seconds                        
WFR(LF)   1 - 25 Hz         EX,EW,BX,BY,BZ  32 seconds                        
WFR(HF)   0.1 - 2.5 KHz     EX,EW           160 seconds                       
HFR       3.6 KHz - 16 MHz  EX, EW          11.875 seconds                    
LP        N/A               Langmuir Probe  32 seconds                        
Sounder   3.6 - 115 KHz     EX, EW          300 seconds                       
                                                                              
The HFR is in SKR mode, with freeze mode for H1. The freeze frequency         
is by default 325 KHz, but this can be tweaked.                               
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  125    1              3.6-319 kHz          
H1   2E   y        y      8     n  20     100 1     0    325k                 
H2   2E   y        y      1     n  20     1   315   50   325kHz-16MHz         
                                                                              
Bands ABC require 0.395 sec to complete, H1 requires 2.74 sec, and H2         
requires 8.25 sec for a total of  11.39 sec per sweep. However, the time      
between analyses is 11.875 seconds.  Every 300 seconds the HFR normal         
analyses are replaced by a Sounder analysis.  The Sounder operation has a     
duration of approximately 40 seconds.  This Sounder analysis is defined by:   
                                                                              
  sounder mode:   EZ AAA                                                      
  1st  sounder freq:      0                                                   
  last sounder freq:     89                                                   
  T1 delay:        10 msec                                                    
  T2 delay:        25 msec                                                    
  T3 delay:        25 msec                                                    
  passive spectra:      2                                                     
  active  spectra:      2                                                     
  # of cycles:       1                                                        
  sounder output A:      3 autos                                              
  sounder output B:      3  AGCs