- 185: Tower, Site tower, Thu 28-Oct-1999 12:26:54 CDT, New winch cable
Between 0930 and 1030 Tony, Cathy, Sean and Julie strung a new winch cable for
the main tower.
- 179: Tower, Site tower, Tue 26-Oct-1999 20:15:11 CDT, Hauling cable
Monday, 25 Oct''99, in the afternoon, the thermal imaging equipment was winched
to the 58m level of the tower. During the process the hauling cable snagged in
the winch gears and got chewed up. The wire ran through the boom pulleys and
fell to the ground wiping out the lowest thermocouple but causing no other
damage.
On Tuesday Tony and Sean inspected the boom and devised the means to thread a
new cable.
- 152: Tower, Site tower, Thu 21-Oct-1999 16:36:22 CDT, Orientation of sensor booms
Steve Semmer and Tony Delany shot the angles of the ten east-side booms
between 1500 and 1630 CD Time, Thurs, 21 Oct. The tripod was set up on
the road. The 5m tower sonic anemometers could not be accurately viewed
from that distance.
55m Sonic 275 54' 20"
50m Sonic 276 12' 50"
45m Prop 276 25' 30"
40m Sonic 276 24' 10"
35m Prop 277 11' 55"
30m Sonic 277 12' 20"
25m Prop 276 21' 15"
20m Sonic 275 48' 50"
15m Prop 277 12' 25"
10m Sonic 277 12' 30"
10/23 Cathy and Steve shot the angles of the 2 sonics on the 5 metre tower.
The bottom sonic (.5m) seemed to be unlevel as well as at an angle to the boom.
5m CSAT 276 42' 30"
.5m CSAT 278 24' 05"
- 62: Tower, Site tower, Sat 09-Oct-1999 12:17:31 CDT, raised and lowered 20m boom
From 10:45 to 11:25, the boom at 20 m was raised and lowered so that we could
switch out hot wire probes (took out #78, put in #71) at that level.
Inspection showed that #78 broke because a tower denizen spun its web across
the probe, probably incurring quite a jolt.
When the boom was lowered, it appeared that the 20m boom was angling off to
the north more than the other booms. Tightening the south guy wire did not
change that.
- 22: Tower, Site tower, Fri 24-Sep-1999 09:06:49 MDT, 55m tower guy wire tensions
55 meter tower guy wire tensions:
September 13, 1999 (just after retensioning)
Guy level Nominal NW corner SW corner SE corner NE corner
Tension
(lbs.)
18' 425-475 475 475 575 450
36' 325-375 260 160 300 350
54' 225-275 200 250 250 215
78' 575-625 690 510 675 625
102' 525-575 600 525 700 600
126' 625-675 650 675 625 625
150' 575-625 650 510 525 700
174' 725-775 750 725 775 650
186' 675-725 590 675 725 675
September 22, 1999 (weekly recheck)
NW SW SE NE
18' 425-475 450 450 425 370
36' 325-375 265 275 310 280
54' 225-275 180 190 250 200
78' 575-625 650 475 600 525
102' 525-575 550 515 650 540
126' 625-675 570 650 540 600
150' 575-625 625 530 500 670
174' 725-775 700 700 700 650
186' 675-725 520 685 735 625
differences in guy tensions at the same level and at different times could
be caused by many different factors - wind loading, slipage of guy clamps,
slipage of anchors due to wind or moisture, etc.
September 29, 1999 weekly recheck
NW SW SE NE
18' 425-475 375 400 390 290
36' 325-375 260 250 300 300
54' 225-275 200 180 230 210
78' 575-625 600 440 500 500
102' 525-575 510 540 525 615
126' 625-675 570 600 520 550
150' 575-625 580 500 495 625
174' 725-775 725 680 670 600
186' 675-725 550 600 630 625
October 8, 1999 weekly recheck by Marcel V.
NW SW SE NE
18' 425-475 490 425 400 300
36' 325-375 250 250 300 450
54' 225-275 280 175 250 200
78' 575-625 575 475 540 460
102' 525-575 525 510 500 590
126' 625-675 550 610 525 550
150' 575-625 600 500 490 625
174' 725-775 700 675 700 600
186' 675-725 500 690 700 610
October 18, 1999 weekly check by Steve S. (unit 2150)
NW SW SE NE
18' 425-475 410 400 425 290
36' 325-375 240 275 325 300
54' 225-275 200 175 240 200
78' 575-625 600 500 550 500
102' 525-575 550 575 550 575
126' 625-675 550 650 575 550
150' 575-625 575 525 500 650
174' 725-775 700 700 725 625
186' 675-725 500 700 675 600
October 26, weekly check by Tony D and Sean ? Wind from S (Unit 2150)
NW SW SE NE
18' 425-475 340 380 400 280
36' 325-375 300 270 300 330
54' 225-275 200 180 260 230
78' 575-625 540 460 520 470
102' 525-575 480 520 510 560
126' 625-675 500 600 560 510
150' 575-625 550 520 500 610
174' 725-775 660 660 710 590
186' 625-725 510 710 660 600