Trigger 80 Description
Sequence: C40, ...
Trigger 80 ( Direction-Finding Survey )
This mode is designed to provide a direction-finding survey mode, with standard temporal resolution and spectral resolution.
Both low-frequency and high-frequency WFR measurements are made, using "toggle" mode. Dust detection is included.
Langmuir Probe sweeps are performed every 640 seconds. The Sounder is disabled.
WFR measurements are made every 32 seconds, which provides both LFR and MFR2 replacement data
via ground processing of the WFR data. However, the snapshot length is set to 512 samples in order
to avoid interference from the HFR, which is in direction-finding mode
| Receiver |
Frequency Range |
Sensors |
Time between Snapshots |
| MFR |
25 - 12 KHz |
EW, BZ |
32 seconds |
| WFR |
1 - 25 Hz |
EX,EW,BX,BY,BZ |
64 seconds |
| WFR |
.1 - 2.5 KHz |
EX,EW,BX,BY,BZ |
64 seconds |
| HFR |
3.6 KHz - 16 MHz |
Eu,Ev,Ew |
32 seconds |
| LP |
N/A |
Langmuir Probe |
640 seconds |
The HFR is in direction-finding mode for its entire frequency
range from 3.6 KHz to 16 MHz. Thus, measurements are made on all three
monopoles EU, EV and EW.
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 8 y 250 1 3.6-319 kHz
H1 2E y y 1 y 80 1 76 50 325k-4.1MHz
H2 2E y y 1 y 80 1 61 200 4.0M-16MHz
Bands ABC require 1.69 sec to complete, H1 requires 13.06 sec, and H2 requires 10.50 sec
for a total of 25.25 sec per sweep. However, to allow time for WFR and MFR snapshots to
occur without interference, one complete sweep is done every 32 seconds. To avoid the
interference from the DF mode, the MFR uses the EW antenna.