August 1997

**Table 5.1:** GBES Tracking Pass Summary for August 1997
		no	% lost			Attended	Unattended
pass	% good	op.	total	hardware	software	% recovered	% recoverable	exp	notes
9708011932	99.00		1			>50			pointing, 20' el offset
9708022104	86.30		13		13	86			ACU problem, late onto source
9708041600	0.00		100					V017d	No satellite signal
9708050016	98.47							V017d	HALCA Ku antenna unwrap
9708051711	97.36		2	2		97		V047t	formatter and ACU problems
9708061942	99.85							VTP01
9708081504	99.29								HALCA behind water tower legs
9708082129	88.51		11	11				V030p	azimuth jumps
9708091739	93.93		6						weak HALCA signal at beginning
9708100130	99.22	X
9708101904	0.00	X	100	100			>50		Decoder hardware problem
9708112133	72.40		27	27		72			Decoder hardware problem
9708131500	87.68		12						HALCA vanished for 20 minutes
9708132128	91.82		8					VT817	HALCA not there first 20 min
9708141729	99.88
9708151744	88.53		11						HALCA signal off GB early
9708162103	97.20								HALCA Ku antenna unwrap
9708181514	99.35								Azimuth jumps
9708191701	99.64								Azimuth jumps
9708202126	99.70
9708220243	99.93
9708221428	99.76
9708222037	95.80							V034b1	HALCA Ku antenna unwrap
9708231547	83.01		16		16	73			ACU stopped
9708241824	99.82	X
9708252205	99.79
9708271512	99.86
9708281633	99.93
9708291933	99.48							VT822	Azimuth jumps
9708302239	99.63							VS07g
9708311322	98.99	X

There was a total of 31 tracking passes in August of 1997 with 4 of these being unattended tracking passes. There were 5 tracking passes that lost data due to problems with HALCA or the schedule file (SRT file). Of the 27 attended tracking passes 22 collected the maximum amount of valid data possible. Software problems resulted in the loss of data on 2 attended tracking passes while hardware problems resulted in the loss of data on 2 of the attended tracking passes. The operators were able to increase the amount of valid data collected in 4 of the 5 passes were data was lost due to hardware or software problems. Of the unattended tracking passes 3 of 4 obtained the maximum amount of valid data. The unattended tracking pass that lost data lost 100% of its data. If an operator had been present for this pass (9708101904) then most of the data could have been salvaged. Also, this unattended tracking pass delayed the detection of the hardware problem by one day which could have prevented the loss of 27% of the data on the next pass.

Of the 9 recording passes, 7 collected the maximum amount of good data while the other two recording passes lost 2% and 11% of the data during the pass.

$\bullet$ Operators helped increase amount of good data in 4 of 5 ``bad'' attended passes.

$\bullet$ Operators would have increased amount of good data in 1 of 1 ``bad'' unattended passes.