Re: BASE 110 Flight Summary



This is Carl WA4ADG. When operating a Geiger counter or any high voltage device in a reduced atmospheric pressure there is a rang of pressure where the air breaks down and conducts heavily. This often is misinterpreted as an increase in radiation when in reality it is noise.

The cure is to coat everything with insulation such as silicone,  to prevent corona discharge. I fight this at work all of the time.





From: [] On Behalf Of BASE_DePauw
Sent: Tuesday, June 28, 2022 3:42 PM
Subject: [GPSL] BASE 110 Flight Summary


BASE 110 flight was very close to predictions, except for the burst altitude.  The predicted burst was 27 km (88 kft) and the ascent reached 30 km(100 kft).  Landing was in corn on the Shelby-Johnson County, IN line ,west of Fairland, which was between 1.2 meter and 1.5 meters (4-5 ft tall).  To retrieve the payload, we had to cross the rows for 70 meters(230 ft).


The secondary radio, W9YJ-12 did not operate.  We will be investigating the failure.


The Geiger array did pass through the Pfotzer maximum, although there was some extra noise from one tube.  Time for a wiring recheck.  The Parallax altimeter, pressure, and temperature board drew quite a bit of current.  This problem will need to be corrected before our longer duration flights.


Thanks for your support,

Howard, KC9QBN




Howard L. Brooks
Professor of Physics and Astronomy
241 Julian Science and Mathematics Center
DePauw University
2 E. Hanna Street
Greencastle, IN 46135

(765) 658-4653

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