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 |
EX, 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 |
EX, 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 3.6-319KHz
HF1 2E y y 1 y 80 1 76 50 0.325-4.125MHz
HF2 2E y y 1 y 80 1 61 200 4.025-16.225MHz
Bands ABC require 1.690 sec to complete, H1 requires 13.059 sec, and
H2 requires 10.498 sec for a total of 25.247 sec per sweep. The hfr
cycle time is 32.000 seconds.
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.