Trigger 3A Description
Sequence: C26
Trigger 3A (Hirate 10.5 KHz Baseband WBR)
This mode is designed to provide high frequency resolution using the 10.5 KHz WBR,
while maintaining a survey mode with standard temporal resolution and spectral resolution.
| Receiver |
Frequency Range |
Sensors |
Time between Snapshots |
| LFR |
1 - 25 Hz |
EX, BX |
32 seconds |
| MFR |
25 - 12 KHz |
EW, BZ |
32 seconds |
| WBR |
0.1 - 10.5 KHz |
EX |
0.125 to 0.375 second* |
| HFR |
3.6 KHz - 16 MHz |
EX, EW |
7.375 seconds |
* While the WBR is scheduled to acquire a 3072-sample snapshot every 1/8 second,
in reality it is dependent on the telemetry mode and upon the amount of data
compression achieved by the Data Compression Chip. Typically the telemetry mode
might be a 60 kbps data rate mode, resulting in something closer to 3/8 second
between WBR snapshots.
The HFR is in a modified "Composite Survey" mode, with the H1 frequencies
which are multiples of 50 KHz excluded to eliminate interference.
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 30 50 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 2.52 sec, and H2 requires 1.46 sec
for a total of 7.14 sec per sweep. This results in a complete sweep every 7.375 seconds.