SUMMARY
Various loadings were set on the central bearing and inclinometry was done each time. These measures confirm the theory that the inclinometry 'spikes' are due to critically low loading on the antenna wheels.

A technical report on the days load adjustments is available here .

The plots below show the differences between the inclinometry data associated with each loading and the appropriate 100-degrees of azimuth of the previous full inclinometry run of 990308. That run, of course, may contain some element of the spikes, but it is the differences here that will reveal the relationship to the c.b. load.

HST start	leg temps	c.b. Load	TX LX RX	TY LY RY
10:03	1.2	91.75% ?
11:52	2.4	95%
13:38	3.4	88%
15:40	5.1	91%

Note that

• The loading at the start is assumed to be that from the last adjustment on 981027 , although it may have decreased since then due to settling.
• The indicated loads are those planned and may be corrected in later versions of this report.
• The HST=15:40 data is part of the full-circle CW run later used to produce the new track model - see the next report .

Ignoring the odd TY behaviour when the load was 88%, and the changing zero-point levels, a high c.b. load (i.e. low wheel load) correlates with large spikes, as predicted ; the spikes appearing when the c.b. load is between 91% and 92%. To illustrate this further, the plot below shows the LY (difference) data at each of the loadings :

The c.b. load was left with the 91% loading, which has to be good.