Ops 11 Apr.

Another fairly light day today, as Steve left in the morning. Thanks Steve for sharing your knowledge during our overlap! 

No pressing issues in the morning data check, other than NA’s coming from the sonic at s12 and later resolving itself, so we decided to swap the Victron at s10 and visit s9 on the way. During these visits the weather was pleasant and skies mostly clear, but we ended up having localized areas of clouds and light to moderate precipitation in the afternoon. Most of the western sites measured rainfall while none of the eastern sites did. Strong winds developed in the afternoon in advance of a cold front, which dropped temperatures quite a bit by the evening. As the winds picked up they blew around some unsecured plastic tub lids at the ISFS base that Bill had to clean up. We will have to secure the site in advance of more winds forecast the next few days. 

S9: 

• Cleaned radiometer 1036-1038 (Note that fan sounds loud)
• Measured boom angle twice, once from in close and once from the road - both 316 magnetic out from the boom or 136 into the boom.
• One turnbuckle nut has loosened completely, so I retensioned the guy slightly and tightened the nut. We also added zip ties to the turnbuckles. 
• Noticed that the lightning rod is loose. We should tighten the next time we drop this tower and should be careful to not stand under the tower when it’s windy.

S10:

• Cleaned radiometer at 1120
• Measured sonic orientation at 137 magnetic into the boom
• We found that the current Victron data cable had a loose connection due to part of the port having broken off. We swapped out this one with the spare and all seems nominal. We shutdown the DSM at 1128 to replace Victron.