EOSS-257, 258, & 259 CU Science Discovery & Metro State Univ

The flights have been renumbered EOSS-257, 258, and 259. The launch site has been moved to Windsor Colorado. Variable winds may force moving the launch site to Deer Trail. Please keep watching this website for updates. Predictions are now updating daily (about 1pm). Click on the link below (or here) to view the prediction information.

The website has been updated with payload plans for each balloon.

  • Two Exempt balloons supporting two one-week CU Science Discovery workshops.
  • One Exempt balloon to refly the Metro State University Sunkist and Deadeye experiments.

Predictions are located here.

Flight Coordinator: 
Event Date: 
Saturday, July 29, 2017 (All day)
Alt Launch Date: 
Sunday, July 30, 2017
Launch Site: 


Exempt balloon with CU Science Discovery payloads and a CU Student 360 degree video payload

Balloon Type: 
1500g Totex latex balloon
9 foot Rocketman High Altitude Balloon Payload Recovery Parachute
144.340 MHzAEØSS-7APRSPrimary Beacon, Timeslotted at 0:00 and 0:30
144.950 MHzKEØBMV-11APRS / DFSecondary Beacon
145.750 MHzKCØD-15APRS / DF / Cutterqualificaiton
Iridium Tracker


Exempt Balloon with CU Science Discovery payloads and the CU Science Discovery GoPro payload

Balloon Type: 
1500g Totex latex balloon
5.8 ft orange and white nylon parachute with spreader ring
144.340 MHzAEØSS-12APRSPrimary Beacon, Timeslotted at 0:10 and 0:40
147.555 MHzKCØD-11APRS / DF / CutterSecondary Beacon
144.360 MHzKCØD-11APRSqualification


Exempt balloon reflying two Metropolitan State University payloads

Balloon Type: 
1500g Totex latex balloon
8.5 ft circumference Sphereachute with cutter and fast release
144.340 MHzAEØSS-13APRS / Digi (EOSS)Primary Beacon, Timeslotted at 0:20 and 0:50
145.570 MHzKCØD-12APRS / DF / CutterSecondary Beacon

Preflight Net:

  • 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

Tactical Calls: 
TacticalCall SignNameNotes