PDS_VERSION_ID         = PDS3                                                 
RECORD_TYPE            = STREAM                                               
OBJECT                 = TEXT                                                 
  PUBLICATION_DATE     = 2005-11-29                                           
  NOTE                 = "                                                    
      S16_TRIG_A6.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 A6."        
END_OBJECT           = TEXT                                                   
END                                                                           
                                                                              
                                                                              
Trigger A6 Description                                                        
                                                                              
Sequence: C37                                                                 
                                                                              
Trigger A6 ( MAG BOUNDARY(max) )                                              
                                                                              
This mode assumes a background survey mode, such as 8A or 8E, is running,     
and on top of that overlays fast WFR data acquisition. In order to do this,   
the LFR data acquisition is changed from its default of toggle mode to        
Hiband-only. This provides the MFR-2 replacement data. The WFR is run         
in LoBand-only mode. The 1-10Hz LFR data can be synthesized on the ground,    
using the fast WFR data. A WFR snapshot, in its nominal 5-channel and         
2048-sample mode, is acquired every 24 seconds, giving almost continuous      
coverage.  In addition to limiting the LFR data acquisition, the data         
compression algorithm for the WFR is changed to "packed" mode, so that this   
faster data rate can be accomplished. The target bit rate is 6000 bps. During 
C37, in a short test, the measured bit rate was 5500 bps; this was using      
trigger 8A as the background trigger.                                         
                                                                              
Receiver  Frequency Range   Sensors         Time between Snapshots            
--------  ----------------  --------------  ----------------------            
MFR       25 - 12 KHz       EX, BZ          32 seconds                        
MFDR      200 - 1400 Hz     EX, BX          60 seconds                        
WFR       1 - 25 Hz         EX,EW,BX,BY,BZ  24 seconds                        
HFR       3.6 KHz - 16 MHz  EX, EW          16 seconds                        
LP        N/A               Langmuir Probe  640 seconds                       
Sounder   3.6 - 115 KHz     EX, EW          600 seconds                       
                                                                              
 The HFR is in a modified "Composite Survey" mode, which now includes         
both auto- and cross-correlations for H1.  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   1000  1              3.6-319KHz           
HF1   2E    y     y        2    n     80  1     60    25 0.325-1.825MHz       
HF2   1E    n     n        1    n     40  1    143   100 1.825-16.125MHz      
                                                                              
Bands ABC require 3.120 sec to complete, H1 requires 5.473 sec, and           
H2 requires 5.034 sec for a total of 13.626 sec per sweep.  The hfr           
cycle time is 16.000 seconds.                                                 
                                                                              
 However, the time between analyses is set to 16 seconds to reduce the        
bit rate.  Every 600 seconds the HFR normal analyses are interrupted by a     
Sounder analysis.  The Sounder operation has a duration of approximately 40   
seconds.  This Sounder analysis is defined by:                                
                                                                              
Sounder Mode: Ex AAA                                                          
1st  Sounder Frequency:   0                                                   
last Sounder Frequency:  89                                                   
T1 delay:   5 milliseconds                                                    
T2 delay:   5 milliseconds                                                    
T3 delay:  15 milliseconds                                                    
Passive Spectra:   2                                                          
Active  Spectra:   2                                                          
No. of Cycles:     1                                                          
Sounder Output A:   3 Autos                                                   
Sounder Output B:   3 AGCs