UBSEDS8 was our second launch with a 36” Qualatex Balloon. After breifly appearing to enter a float at 9.3km, this flight continued to slowly ascend, eventually reaching 11.2km. This is possibly a record for the highest flight with a Qualatex balloon.
This envelope was pre-stretched slightly more than UBSEDS6, eventually reaching an internal pressure of 4.9kPa as measured on the Omron M2.
This flight enabled APRS tracking outside of countires that disallow airbourne APRS operation. However no packets were heard, possibly due to the output power being too low. More investiagion required.
The output voltage swing from the TCXO on this board seemed particularly low, and it would not drive the MCU input. The TCXO is normally used by the MCU for symbol timing and to measure the TCXO drift against GPS, but for this flight the MCU used its internal oscillator. The frequency of the internal oscillator is only specified to ±2.5% and this error in the symbol timing prevented Contestia from decoding except at high SNRs. RTTY appeared to be unaffected.
The tracker failed about 4 hours into the flight. This didn’t appear to be related to low temperatures.
- Total distance traveled:
- Great circle distance:
- Maximum altitude:
- Countries passed through:
Thank you to all listeners who tracked this flight!