Trigger 14 Description

Sequence: All
Trigger 14 (LF-WBR Mode)
This mode is designed to provide a Survey mode, coupled with Low Frequency Wideband (LF-WBR) measurements. The LF-WBR measurements are done using the WFR in single channel mode; the data is DCC-compressed (using the onboard data compression chip), and because of this, the gain is set to be fixed at 30 dB. Periodic 6-channel Waveform measurements are made also. The entire RPWS frequency range (1 Hz - 16 MHz) is NOT covered, because the LFR data must be deleted to provide the LF-WBR data. Langmuir Probe data is also provided at a high rate; a sweep is done every 10 seconds, and between sweeps a 128-point density measurement is done at a 20 Hz sampling rate.

Receiver	Frequency Range	Sensors	Cycle Time	Snapshot Size
MFR	25 - 12 KHz	EX, BZ	32 seconds
WFR	.05 - 2.5 KHz	EX, EW, BX, BY, BZ	341 seconds	512
HFR	3.6 KHz - 16 MHz	EX, EW	9.875 seconds
WFR	.05 - 2.5 KHz	EX	1.5 seconds	10240
LP	N/A	Langmuir Probe	10 seconds

The HFR is in CMS mode (Composite Mode Survey). No direction-finding is done. 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    1000      1                3.6-319 kHz
H1   2E   n         y         2       n    80        1     60    25   325k-1.8MHz
H2   1E   n         n         1       n    20        1     72    200  1.8M-16MHz

Bands ABC require 3.16 sec to complete, H1 requires 5.05 sec, and H2 requires 1.46 sec for a total of 9.67 sec per sweep. Data collection and output limits the snapshot time to 9.875 seconds.