July 1998

 

Table 27.1: GBES Tracking Pass Summary for July 1998

		no	% lost			Attended	Unattended
pass	% good	op.	total	hardware	software	% recovered	% recoverable	exp	notes
9807021055	99.48								phase jumps
9807070816	97.39		2	2		70		V103d	tape lost vacuum twice
9807080313	99.62							VS10t
9807081253	32.27	X	67						HALCA signal lost
9807090431	99.64	X
9807110903	60.49	X	39	39			39		ant. osc. (bad tach in motor)
9807111512	0.00								HALCA not commanded
9807120203	99.84	X*					100
9807150831	99.73								testing new decoder
9807160709	99.42
9807170207	97.99		2		2	97		V101b	s2 software bug, lost  15m recording data
9807180323	97.85		2						HALCA signal late
9807180942	98.49		1			98		V037a2	phase jump; HALCA signal late
9807210711	99.50
9807221000	99.80
9807230323	98.15	X	1						HALCA signal late
9807230510	99.81								phase jump
9807240436	99.62
9807260630	96.06		3	3		96		V116a1	Demodulator problems
9807270120	99.73							V116a2	phase jumps
9807280234	99.69							V116a5
9807290353	89.09		9	9		50		V064b2	tape lost vaccuum; HALCA Ku ant. unwrap
9807291422	99.32
9807300514	96.14							V083c2	HALCA Ku antenna unwrap
9807310024	99.93							VS03z

There was a total of 25 tracking passes in July of 1998 with 5 of these being unattended tracking passes. Of the 20 attended tracking passes 16 collected the maximum amount of valid data possible. Of the 5 unattended tracking passes only 2 collected the maximum amount of good data. There were 5 tracking passes that lost data due to problems on HALCA or HALCA pointing to the GBES late.

Of the 10 recording passes, 6 collected the maximum amount of good data while the other recording passes lost 9% & 2% of the data due to tape vaccuum problems, 2% of the data due to an s2 controling software bug and 3% of the data due to demodulator problems.

The antenna motor oscillations during the 9807110903 unattended tracking pass would have resulted in the loss of data from the next tracking pass if the next tracking pass was not effected by the HALCA APS not being commanded to look at the GBES.

$\bullet$ 16 of 20 attended passes had max good data.

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

$\bullet$ 2 of 5 unattended passes had max good data.

$\bullet$ Operators would have increased amount of good data in 2 of 3 ``bad'' unattended passes.

$\bullet$ A total of 0.71 tracking passes lost data due to problems with HALCA.

$\bullet$ A total of 0.02 tracking passes lost data due to software problems.

$\bullet$ A total of 0.53 tracking passes lost data due to hardware problems.

$\bullet$ 6 of 10 recording passes were completely successful.

$\bullet$ A total of 0.17 recording passes lost data.