PDS_VERSION_ID         = PDS3                                                 
RECORD_TYPE            = STREAM                                               
OBJECT                 = TEXT                                                 
  PUBLICATION_DATE     = 2012-09-27                                           
  NOTE                 = "                                                    
      TRIG_A8.TXT describes the RPWS instrument configuration for the         
      High Frequency Receiver (HFR), the Medium Frequency Receiver            
      (MFR), the Waveform Receiver (WFR), the Langmiur Probe (LP), and        
      the Sounder when using Trigger A8."                                     
END_OBJECT           = TEXT                                                   
END                                                                           

Trigger A8 Description                                                        
                                                                              
Sequence:  S05,...                                                            
Trigger A8 ( RNGSAT, Rings & Satellite Regions )                              
This mode assumes a background survey mode, such as 8A or A0, is running,     
and on top of that overlays fast WFR data acquisition.  In order to do this,  
the LFDR data acquisition is stopped (it 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.  The WFR is run in toggle     
mode, so these snapshots alternate between 25 Hz mode and 2.5 KHz mode.  In   
addition to stopping the LFDR 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 5800 bps.  During C35, in   
a short test, the measured bit rate was 5700 bps; this was using trigger 8A   
as the background trigger.                                                    
                                                                              
Receiver  Frequency Range   Sensors         Snapshot Spacing                  
--------  ----------------  --------------  ----------------                  
MFR       25 - 12 KHz       EX, BZ          32 seconds                        
WFR       1 - 25 Hz         EX,EW,BX,BY,BZ  48 seconds                        
WFR       .1 - 2.5 KHz      EX,EW,BX,BY,BZ  48 seconds                        
HFR       3.6 KHz - 16 MHz  EX, EW          8 seconds                         
LP        N/A               Langmuir Probe  48 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    500  1              3.6-319KHz           
HF1   2E    y     y        2    n     40  1     60    25 0.325-1.825MHz       
HF2   1E    n     n        1    n     40  1     72   200 1.825-16.225MHz      
                                                                              
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 8.000 seconds.                                                  
                                                                              
                                                                              
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