Next Flight

EOSS-218 CU Boulder & STEM School Flight

EOSS-218 will fly a University of Colorado Boulder HDTV signal monitoring experiment and several payloads in support of schools with programs in Science, Technology, Engineering and Math (STEM).  Stratospheric experiments from:

  • Montclair School of Academics and Enrichment
  • Douglas County STEM Academy
  • National Space Science & Technology Institute
  • Eaton Middle School
  • Estes Park Engineering Class
  • Denver School of the Arts Amateur Radio Club.  
Flight Coordinator: 
Event Date: 
Saturday, February 13, 2016 (All day)
Alt Launch Date: 
Sunday, February 14, 2016
Launch Site: 


Payload check-in: 0545

Launch time: 0700

Flight path predictions are available here. Scroll down to the flight, date, and anticipated launch site. Click on the GIF link to the right to see a prediction map. Initially the prediction is based on the average winds over 30 years (1981-2010). Starting 15 days before the flight the prediction will be based on the National Weather Service prediction models and will be updated daily. Higher confidence is given to predictions within 3 days of launch, with discussion and final determination of the launch site occurring at that time.

Balloon Type: 
Totex 3000g Latex
10 ft circumference Sphereachute
145.600 MHzKEØBMV-11APRS/Cutter/DFSecondary Beacon, Timesloted 0 and 30 seconds
144.340 MHzAEØSS-13APRS/DigipeaterPrimary Beacon, Timeslotted 15 and 45 seconds

Preflight Net:

THE PRE-FLIGHT NET OCCURS AT 8PM ON THE EVENING BEFORE THE LAUNCH. Everyone is welcome to listen and hams are encourged to check in to the net. The EOSS Launch Team and EOSS Tracking Team will exchange the details necessary for a successful flight.

  • 147.225 MHz CRA Repeater (107.2 Hz Tone) 8 pm MDT preceding night
  • 146.940 MHz (103.5 HZ Tone) RMRL Repeater if the CRA machine is down
  • 146.640 MHz (100 Hz Tone) DRL will serve as a backup frequency

Recovery Operations:

  • 449.450 MHz RMRL (103.5 Hz Tone)
  • 448.225 MHz (141.3 Hz Tone) Testing… PL verified 7/2/14
  • 446.100 MHz Field Simplex
  • 146.550 MHz Backup field simplex

Launch Site Simplex: 146.550 MHz

HF - Possible ops: 7.235 LSB

TR Breakfast: 
More Wednesday when the launch site is determined. Stay tuned - Marty
Tactical Calls: 
TacticalCall SignNameNotes
AlphaWAØGEH, KCØDMarty, MarkAlpha Trackers
BravoW9CN, KBØYRZMike, ChrisBravo Tracker Team, Backup Alpha
CharlieKCØRPSJimFlight Coordinator, Tracker
EchoKD0SEM, KE0CQQDave, RyanTracker, Saturday Only