MM49 - 2020-10-12

Tracker Details

Tracker Type: WSPR

Model: PicoTrackerWSPR1Rev5

Configuration:

trackerId[4] : MM49

wsprCallsignId[2] : Q4

gpsLockTimeoutMs : 150000 2:30

lhAltFtThreshold : 20000

hAlt.wakeAndEvaluateMs : 2700000 45:00

lAlt.wakeAndEvaluateMs : 180000 3:00

lAlt.stickyMs : 36000000 10:00:00

crystalCorrectionFactor : -400

systemClockOffsetMs : 7

Launch Parameters

Balloon and Payload

Single 52" TR9 sphere
22.6 gram payload
6.0 grams free lift

Predictions

General Thoughts / Observations

The previous test flight (MM48) acted oddly by rising then descending, then rising again. I could not pin a cause for that, so I took a shot by adding more free lift, this time 6 grams. After a perfect launch, it rose to 6,500 feet, only to descend and repeat the up & down pattern that MM48 did.

I tested the material to see if it was gaining weight from humidity, that is not the case. The cause is still unknown at this time.

Thoughts for next time

More work needs to be done to understand the failure cause.