10/18/03 St1 13:05-13:35
St4 14:30-15:15
TRH Noise Problem Note:
Note: This noise apparently doesn't appear on the RH, only
the resistive T transducer.
St1:10/17 we moved the yaggi antenna to the West leg.
This may have reduced the noise on the Trh.
10/18 we tried for giggles putting a ground
wire from the shield tube up to the main housing
to see if that would help.
Looking at data messages on the PC, we did not
see the noise.
St4:10/18 This station had been setup with a microStrip (ie
broader beam width than yaggi) on the west leg.
We confirmed that was OK for preventing noise on
the microBaro, but it clearly had the worst noise
of all stations on the Trh.
We tried the 'funky ground wire on the shield' and
per observing the data messages on the PC, that clearly
did not fix the problem.....bummer.
We moved the antenna roughly to the SW by about 3m and
that fixed it.
Result: Improvement in shielding of TRH needed (further tests in
Boulder to help determine best method)
Greater awareness in placement of GOES antennas to avoid
problem esp. in user sensors. Thank goodness it
didn't effect the turbulent flux csat/h2o, etc.