Inclinometry ws done as follows:

    Datasets  El Dirn     HST     mean leg temperatures   Humidity
                          start     start   middle   end       %
  ( 20060821  89  cw      00:29      8.0      7.4    7.0      -- 
    20060822  89  cw      18:00       -        -      -       -- 
    20060824  89 ccw      04:00      8.1      7.5    7.1      -- 
    20060825  89  cw      01:00      6.7      6.4    6.2      --
    20060825  89 ccw      04:00      6.2      6.1    6.0      -- )
    20060826  89  cw      05:00      4.1      3.9    4.0      --
    20060826  89 ccw     ~08:00      4.0      4.3    4.8      --

The datafiles are given HST-derived names. Data is recorded from the 3 active inclinometers only: there is no strain gauge data, for instance.

The data are good, and of the 'low-amplitude' variety seen yesterday.

• The difference between the CW models derived from the CW data of the past two days is shown below, where the scale on the left side is in arcsec:
  
  Click on image for better view

• The CW-CCW differences are shown here:
  

  The CW-CCW differences are v.similar to those seen in 2005.
  But remember that these data are otherwise totally suspect because of the low-amplitude of the TY profile and its disimilarity to the RY profile.

Additionally, tests were made to throw light on the reality or otherwise of the low-amplitude Y-axis (antenna pitch) tilt readings. They come through DGH Channel 2 from the inclinometer in the receiver cabin, mounted under the TMU support frame. The inclinometer in use in recent years has been #2036. Last night a short (10 DGH electronics box and a further short CW run (test2). Then the inclinometer itself was replaced on its mount by #4459 and the test repeated (test3). Tonight, the inclinometer was rotated on its mount through 90 degrees so that the elevation tilt is measured by the x-axis tiltmeter and fed through the Channel 1 DGH unit (test 4 and test5). All data are of 'low amplitude' (units in mV):

This seems to eliminate the inclinometers and the DGH units as the source of the low-amplitude TY data. Inclinometer #2036 was returned to its role as the 'TMU'-inclinometer in the receiver cabin.

The 'normal' data of the 23rd still need explaining.