PDS_VERSION_ID         = PDS3                                                 
RECORD_TYPE            = STREAM                                               
OBJECT                 = TEXT                                                 
  PUBLICATION_DATE     = 2015-09-26                                           
  NOTE                 = "                                                    
      TRIG_52.TXT describes the RPWS instrument configuration for the         
      High Frequency Receiver (HFR), the Waveform Receiver (WFR), the         
      Wideband Reciever (WBR), and the Dust detector algorithm when           
      using Trigger 52."                                                      
END_OBJECT           = TEXT                                                   
END                                                                           

Trigger 52 Description                                                        
                                                                              
Sequence:  S03 ...                                                            
Trigger 52 ( SKR WBR cyclic turn-on, without compression)                     
                                                                              
This trigger is designed to overlay HF Wideband Receiver data, at 325 KHz,    
on top of a direction-finding trigger, such as 80 (Antenna Calibration), or   
94 (SKR/Aurora Outside Source).  This mode is designed to provide a hirate    
mode for analyzing SKR fine structure.  This is accomplished by running the   
WBR in the "down-convert" mode, using the 25-KHz wide signal provided by the  
HFR, which is simultaneously running in millisecond at the frequency          
provided to the WBR.  Data acquisition continues for all receivers, with the  
exception of the dust detector and the HFR normal analysis mode.  In          
addition to selecting the 80-KHz band, with the HF mode selected at 325 KHz,  
this trigger turns off compression of the WBR data, and forces the snapshot   
length to 2048 samples.  These things are necessary to prevent the            
low-frequency WFR and the LFDR data acquisition from blocking WBR data        
acquisition.  Additionally, the HFR is run in millisecond mode, at 325 KHz.   
                                                                              
Receiver  Frequency Range   Sensor      Snapshot Spacing    Snapshot Length   
--------  ----------------  ----------  ------------------  ---------------   
WBR       0 - 80 KHz        HF(325KHz)  0.250 second        2048              
HFR       310-340 KHz band  EX          about 2.25 seconds  2048              
                                                                              
                                                                              
                                                                              
Other notes:                                                                  
                                                                              
This trigger produces a maximum data rate of about 139 kbps.  If the          
Telemetry Mode is S&ER-3, the data is limited to 60,928 bps.                  
                                                                              
There is a 60-second delay following the execution of this trigger, and       
preceding the start of the WBR data acquisition.  In sequences C37 and C38,   
this was only a 35-second delay.  This allows time for the HFR to finish any  
analysis which might be in progress.  There will be a gap in the HFR normal   
analysis while it is in this mode, so this trigger should only be used        
briefly.