On-site personnel:

Beth Bergeron (Field Camp Manager), Joe Kujawski, and Todd B. Johnson (AGO engineers), comprised the service crew for the AGO-5 return mission.

Station:

The TEG was functional upon arrival, but the Turbo batteries were dead. There was no power to the experiments, DCU, and DAU.

Reason for Revisit:

The station PSC was malfunctioning and it was suspected that the storage computers were not saving data.

Corrective Action:

The service team flew into the site and examined the PSC. All PSC circuit boards, BAGOPUM, BAGOPRO, and BAGOEXP were replaced. The system was rebooted and power was active in all experiments. All experiment and power channels were checked and determined functional. One of the STO computers was non-operational, so it was removed from the DCU. Data was collected and storage on the active STO was confirmed.
 

Stanford VLF/ELF:

In the initial servicing of AGO-5, the Stanford experiment did not have a power bus board where the three Broad Band cards were to be placed. Upon returning to the site, the service team brought a replacement power bus board to be utilized in the experiment. The board was installed and the three Broad Band boards were inserted. However, the experiment would not work with this configuration so the Broad Band boards were removed. The power bus board was left in the field but the other boards were taken back with the service team. The experiment was left operational and recording data on all of the analog channels, but does not have a Broad Band component.

Dartmouth

Dartmouth's data was examined to try and determine the source of the unusually high broadband noise seen by the experiment. A noise interference test between Dartmouth and the other experiments determined that the noise did not come from any of the other experiments or from the TEG Turbo. The only remaining possible sources of noise are the Dartmouth Experiment, the DAU, the PSC, or the DCU. It is recommended that during next year's service visit, the service team be prepared to replace all components of Dartmouth's experiment including the rack, pre-amp, and antenna. Also, a more extensive debugging of possible interference from the DAU, DCU, and PSC should be implemented.