EOSS-290 GPSL Pella, Iowa - Recap

EOSS-290 with the KCØRPS Geiger counter module, a KCØD APRS radio beacon on a qualification flight, and KE7KCK's GoPro camera weighting a total of 2.71 pounds along with two GPS-equipped radio beacons, and a 10 ft. Rocketman parachute were launched on a 1200 gram balloon from the Pella High School athletic fields in Pella, Iowa  (N41° 23.658', W92° 53.328) at an elevation of 850 feet at 08:14:04 AM MDT on June 15, 2019.  The last packet received before balloon burst was at 9:50 AM at an altitude of 99,778 ft. after an ascent averaging 1132 ft./min.  The maximum recorded speed was 63 mph at 10:08 AM at an altitude of 44,305 ft. on descent.   The parachute and flight string touched down at 9:28 AM at N39° 33.22', W102° 36.33' and were recovered at an elevation of 4,222 ft. after a flight lasting 2 hr. and 6 min.  The horizontal touchdown speed was 3 mph and the vertical speed was 572 ft./min.  The touchdown point was about 2.1 miles north of the town of Barnes City, IA  (N41° 30.516', W92° 29.988').  The straight line distance between the launch site and touchdown point was 23.6 miles.  Videos of the launch, recovery and burst may be viewed on the EOSS YouTube channel here: EOSS on YouTube


Original Announcement: 

Great Plains Super Launch (GPSL) is an annual High Altitude Balloon Symposium.  For 2019 it  will be in Pella, IA,, June 13, 14 and 15.  Hosted by Pella Explores Near Space (PENS)EOSS usually attends for a day of tours, HAB discussions and a group launch.  Watch https://www.superlaunch.org/ for details.Jeff (N6BA) will be presenting information about the EOSS SDR Tracker. NOTE: We will be using 145.645 MHz as the tracking/beaconing frequency for this flight.  We are testing a new configuration of the radio in KCOD-15 to hopefully improve digipeating and want to test in under real flight conditions.  In addition, please note that the bottom frequency is 145.765. EOSS is not using 144.340 MHz duirng this flight.The flight prediction can be found here

Event Date: 
Saturday, June 15, 2019 - 08:00
Flight Coordinator: 
Nick N0LP
X=15, Y=50 Test: N 41.500 deg., W 92.900 deg. Answer: X=15.5, Y=80.4


Balloon Type: 
Kaymont 1200g
Rocketman 10'
144.905KC0D-1APRS/DF/ReleasePaired with release Baker
145.645KC0D-15APRS/DigiUse this frequency to Track/Beacon
145.765AE0SS-13APRSBackup "Bottom" Beacon

EOSS Preflight Eyeball Net preceding night:

The launch site will be Pella Christian High School practice fields (on the east side of the school building @ 300 Eagle Lane), 41.3936, -92.8897 (N 41 23.616, N 92 53.382)

Launch Site Frequency:

  • 446.050 MHz Simplex  
        (Note that some radios assume these are repeater frequencies and attempt to put a 5 MHz offset in the transmit frequency automatically)

Track & Recovery Operations:
        Repeaters: Pella area repeater TBD

        Simplex Frequencies:
        • 446.100 MHz EOSS Balloon Field Simplex 
        • 446.150 MHz Balloon #2 Field Simplex
        • 446.200 MHz Balloon #3 Field Simplex
        (Note that some radios assume these are repeater frequencies and attempt to put a 5 MHz offset in the transmit frequency automatically)

2M Direction Finding Frequencies:

  • 144.340
  • 144.360
  • 144.905
  • 145.535
  • 145.645
  • 145.710
  • 145.765
Tactical Calls: 
TacticalCall SignNameNotes
AlphaWAØGEH-9, KC0D, N0WPRMarty, Mark, Sharon, PaulaAlpha Team
BravoKC0LJohn, EileenBravo, Alpha Backup, Texas
CharlieK0JWB, K0NKKJohn, NancyTrackers
DeltaKC0RPS, N0LPJim, Nick, Randy
EchoN2XGL, N6BA, KE0NZVJeff, Jeff. JeffConfusing conversations in that car!
GolfN0NDM, KB0YRZ, W0CBHLarry, Chris, Jen, Benjie, RosieTracker, Basketball team
HotelKD0SEMDave, CherylTracker
IndiaKE7KCKTomTracker, EOSS President
KiloW7MJK, KG7ORBMike, NickTrackers, Pico, Wyoming
TR Breakfast: 
At Hotel prior to leaving for launch site