Trigger 8A Description

Sequence: C27, C30, C31, etc.
Trigger 8A ( Survey Mode, All Regions )
This mode is designed to provide a survey mode, with standard temporal resolution and spectral resolution. Both low-frequency and high-frequency WFR measurements are made, using a "toggle" mode, although a fixed gain (maximum) rather than an auto gain mode is required until a future software update. Dust detection is included. Langmuir Probe sweeps are performed every 640 seconds. A Sounder measurement replaces the HFR analyses every 640 seconds.

Receiver Frequency Range Sensors Time between Snapshots
LFR 1 - 25 Hz EX, BX 32 seconds
MFR 25 - 12 KHz EX, BZ 32 seconds
WFR 1 - 25 Hz EX,EW,BX,BY,BZ 320 seconds
WFR .1 - 2.5 KHz EX,EW,BX,BY,BZ 320 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 640 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        16       n    1000      1                3.6-319 kHz
H1   2E   y         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 5.47 sec, and H2 requires 1.46 sec for a total of 10.09 sec per sweep. However, the time between analyses is set to 16 seconds to reduce the bit rate, and also to synchronize with the 640-second sounder operations. Every 640 seconds the HFR normal analyses are replaced by a Sounder analysis. The Sounder operation has a duration of approximately 40 seconds. This Sounder analysis is defined by:
  sounder mode:   EZ AAA
  1st  sounder freq:      0
  last sounder freq:     89
  T1 delay:        10 msec
  T2 delay:        25 msec
  T3 delay:        25 msec
  passive spectra:      2
  active  spectra:      2
  # of cycles:       1
  sounder output A:      3 autos
  sounder output B:      3  AGCs