July 1999

 

Table 51.1: GBES Tracking Pass Summary for July 1999

		no	% lost			Attended	Unattended
pass	% good	op.	total	hardware	software	% recovered	% recoverable	exp	notes
9907011609	99.87
9907021731	99.87
9907031551	99.70
9907041709	99.68								phase glitch
9907051356	99.70
9907061434	98.80								HALCA Ku antenna wire-wrap
9907071755	99.85
9907081853	99.88
9907091414	99.75
9907091831	99.20								Decoder clock not setting correctly
9907101236	99.52								Rack V overheated, costas unstable for short time
9907111602	99.80								Rack V overheated, costas unstable for short time
9907121755	88.34		11	11					Downconverter problem?
9907131937	99.70
9907141403	99.82
9907141812	99.37							W112n	phase glitches
9907151951	99.53							W112p	HALCA 1 min late
9907161757	0.00								HALCA not commanded
9907162136	99.57							W112y	clock jump (T-storm), phase glitch
9907171628	93.69		6	6					Peltier failed again, antenna stopped tracking
9907181138	99.78								big phase jump
9907191104	97.24		2	2					HALCA signal late, demodulator problem
9907191230	98.71		1	1					many, many glitches - demodulator problem
9907191826	73.47		26	26				VS03x	demodulator problem
9907201259	0.00		100	100					demodulator problem
9907201954	99.92							W112o
9907211338	99.19								lots of clock setting events - demodulator/decoder problem?
9907212207	98.58		1	1					demodulator/decoder problem?
9907221455	95.68		4	4					demodulator/decoder problem?
9907221706	99.84
9907230052	99.67
9907231131	99.21							W035n	big phase glitch
9907231834	77.78		22	22					Peltier failed, electronics overheated
9907241249	99.32							W035o	HALCA singal 1 minute late
9907241737	93.92		6	6					Peltier failed, electronics overheated
9907251229	99.86
9907251920	99.90
9907261345	99.70
9907271500	98.07		1						HALCA signal late
9907281617	99.45							W015b2	HALCA signal late
9907291913	99.45								HALCA signal late
9907301232	83.89		16	16					Vertex heated up - resulted in bad peakup solution due to poor link stability
9907311348	95.45		4	4					Vertex overheated

There was a total of 43 tracking passes in July of 1999 with none of these being an unattended tracking pass. Of the 43 attended tracking passes 31 collected the maximum amount of valid data possible. The vertex overheating due to the Peltier heater/cooler failing or being insufficient along with unseating an IC connector in the demodulator resulted in the loss of data for 12 tracking passes. Five tracking passes lost data due to the link from HALCA not showing up on time.

Of the 8 recording passes, 7 collected the maximum amount of good data.

$\bullet$ 31 of 43 attended passes had max good data.

$\bullet$ Operators helped increase amount of good data in 0 of 12 ``bad'' attended passes.

$\bullet$ A total of 1.99 tracking passes lost data due to hardware problems.

$\bullet$ 7 of 8 recording passes were completely successful.

$\bullet$ 7 of 8 recording passes were at least 80% successful.

$\bullet$ A total of 0.26 recording passes lost data.