Trigger 52 Description
Sequence: S03 ...
Trigger 52 ( SKR WBR cyclic turn-on, without compression)
This trigger is designed to overlay HF Wideband Receiver data, at 325 KHz, on top of a direction-finding trigger,
such as 80 (Antenna Calibration), or 94 (SKR/Aurora Outside Source). This mode is designed to provide a hirate mode
for analyzing SKR fine structure. This is accomplished by running the WBR in the "down-convert" mode, using the 25-KHz
wide signal provided by the HFR, which is simultaneously running in millisecond at
the frequency provided to the WBR. Data acquisition continues for all receivers, with the exception of the dust detector
and the HFR normal analysis mode. In addition to selecting the 80-KHz band, with the HF mode
selected at 325 KHz, this trigger turns off compression of the WBR data, and forces the snapshot length
to 2048 samples. These things are necessary to prevent the low-frequency WFR and the LFDR
data acquisition from blocking WBR data acquisition. Additionally, the HFR is run in millisecond
mode, at 325 KHz.
| Receiver |
Frequency Range |
Sensor |
Time between Snapshots |
Snapshot Length |
| WBR |
0 - 80 KHz |
HF(325KHz) |
0.250 second |
2048 |
| HFR |
310-340 KHz band |
EX |
about 2.25 seconds |
2048 |
Other notes:
This trigger produces a maximum data rate of about 139 kbps. If the
Telemetry Mode is S&ER-3, the data is limited to 60,928 bps.
There is a 60-second delay following the execution of this trigger, and
preceding the start of the WBR data acquisition. In sequences C37 and C38,
this was only a 35-second delay. This allows time for the HFR to finish
any analysis which might be in progress. There will be a gap in the HFR
normal analysis while it is in this mode, so this trigger should only
be used briefly.