I tried another test on T.2m.a to see if we could find the noise source.
THe 50Y probe was changed. The noise still exists. This test took place
between 12:00 and 13:30 local time.

I was working on the TRH sensors at Aspen between 1:30 and 3:30 on 9/24.
During this time I moved the 6 meter TRH back up to 6 meters.
TESTS:
  There was 3 tests I conducted on the 2m TRH. The first was to disconnect
the TRH from the data system completely and see if noise was still existing
on the temperature channel. The results showed a small amount of variation,
approximately .02 C. It was not obvious if this was a noise problem of just
random changes in the atmosphere. The second test was too put a fixed voltage
reference in on the temperature channel. In this case the output signal was
solid with no changes.
 The third test was with the reference signal as input with the TRH
communicating with marigold. Based on Splus plots the noise was not present.
As a fourth test we will change the 50Y probe. Unfortunately I do not have
an extra probe. Will try in the next day or two.

I've just noticed that all of the outputs from the 30m TRH have an alternate sample oscillation -- in T of about 0.5C now.  This has been the case since the
beginning of the aspen data set (I just spot-checked 8/27, 8/20, 8/2 data),
though the amplitude varies.

For testing, I just reduced the number of channels to 2 ("CHNL 0 1" command to
the TRH) and still see the oscillation, though only with a 0.1 C amplitude.
I've returned it back to 4 channels.

Undoubtedly, this is due to the Tsfc being connected -- even when it isn't being
converted.  Should we switch this Tsfc to the CR10 box?

8/20/04 ~14:00 local

Fan at 2m was checked.  Seemed reasonable but
'surging' a little.  Swapped it out with a new one.

Also found a tiny bid of cobweb at inlet to sensor
that may be factor.
Filter seems slightly dirty but OK.

8/20/04 ~15:00 local

Fan at 1m was missing it's blade...ie of no value.
Installed fan removed from pine 2m which appears
to work well enough.

About 0400 on jul 23 (Friday), TRH.1m.w started producing huge values.
I just rserial'd and did a "MR" reset, which brought the data back in line.

Things I just did:
- cleaned krypton at 2m (forgot to bring the climbing harness, so couldn't go
higher)
- moved TRH.1m up closer to 1m (now still about 5cm below the sonic)
- bolted down the AC breakoutbox (I didn't have the hardware before)
- removed the power and mote for mote #23, that has been having problems

The TRH at the 2m height is reading high temperatures.