PDS_VERSION_ID         = PDS3                                                 
RECORD_TYPE            = STREAM                                               
OBJECT                 = TEXT                                                 
  PUBLICATION_DATE     = 2009-12-17                                           
  NOTE                 = "                                                    
      TRIG_54.TXT describes the RPWS instrument configuration for the         
      High Frequency Receiver (HFR), the Wideband Reciever (WBR), and         
      the Dust detector algorithm when using Trigger 54."                     
END_OBJECT           = TEXT                                                   
END                                                                           

Trigger 54 Description                                                        
                                                                              
Sequence:  C37, C38, ...                                                      
Trigger 54 ( SKR WBR cyclic turn-off)                                         
                                                                              
This trigger is designed to terminate Wideband Receiver data acquisition,     
which was nominally started by the SKR WBR cyclic trigger (52).  Data         
acquisition continues for all other receivers, dust detection is resumed,     
and the HFR analysis mode is re-enabled.                                      
                                                                              
Receiver  Frequency Range   Sensors     Snapshot Spacing                      
--------  ----------------  ----------  ----------------                      
HFR       3.6 KHz - 16 MHz  EU, EV, EW  32 seconds                            
                                                                              
                                                                              
                                                                              
Other notes:                                                                  
                                                                              
Since the assumed HFR mode is a direction-finding mode, such as Trigger 80    
or 94, the time between snapshots for the HFR is restored to 32 seconds.      
This may be a problem if the background trigger had a different value for     
this, as is the case for the normal survey triggers, such as 8A, 8E, and A0.  
                                                                              
Another HFR parameter which is restored is the H1 start frequency, which is   
restored to 325 KHz.  This is usually not a problem, since that is the value  
for most HFR operating modes.