EOSS-269, 270, 271, 272 Gateway to Space & COSGC - Recap

EOSS-269, 270, 271, 272 launched on 4/7/18 carrying CU Gateway to Space and COSGC colleges payloads.  Balloons were launched from Eaton, Colorado and all payloads were recovered 130-140 miles downrange near Vona, Colorado.

EOSS-269 reached an altitude of 97,067 ft and landed at 39.97019, -103.13995

EOSS-270 reached an altitude of 94,542 ft and landed at 39.40891, -102.8575

EOSS-271 reached an altitude of 95,828 ft and landed at 39.37105, -102.7435

EOSS-272 reached an altitude of 90,535 ft and landed at 39.27356, -102.65756

EOSS volunteer members supporting the flight can file for mileage here: Member mileage reimbursement link.   

Original Announcement: 

Updated 4/6/2018 1300:  Changed launch times and all balloons to "Lite".  First Balloon will launch at 0730.   Payload plans revised and posted below.  24 hours predictions are posted. 

Due to predictions of cloud cover over the launch site, this flight will be configured as 4 exempt flights.  See below for exempt payload plans  Click here to track these flights in real time.

***TRACKERS AND I-GATERS*** Please note that we are utilizing some new top beacon frequencies.  These are optimized with respect to simplex band plan and intermodulation based on the research of N0LP and K0SCC. Please program into your radios for this and future flights.  If you shift to the top frequencies while tracking, please turn off your beacons, and keep Alpha informed of your position with voice comms.

Predictions will begin updating approximately 10 days before the flight and will be posted here: Predicts  (Although the website indicates Class B fail, this is due to the conservatism of the prediction algorithm.  The balloon path is outside of the 30 nmi radius around DIA)




Event Date: 
Saturday, April 7, 2018 - 00:00
Flight Coordinator: 
Launch Site: 
Last Chance X=65, Y=50 test N 39.400, W 102.800, Ans: 107, 26.8

EOSS-269 Lite

This will be a flight of 4/5 CU Gateway to space payloads

Launch Time 0730 Mountain Time

Balloon Type: 
1500g Kaymont
9 ft Rocketman
144.905 MHzKC0D-1APRS/Release/DFWireless Release
144.34 MHzK0SCC-9APRSSlotted at 00 and 30

EOSS-270 Lite

This will be a flight of 4 CU gateway to space payloads

Launch Time 0750 Mountain Time

Balloon Type: 
1500g Kaymont
9ft Rocketman
145.535 MHzKC0D-15APRS/Release/DFWireless Release
144.34 MHzAE0SS-13APRS/DigiSlotted at 10 and 40

EOSS-271 Lite

This will be a flight of COSCG payloads from various colleges

Launch Time 0810 Mountain Time

Balloon Type: 
1500g Kaymont
10ft with cutter only
145.600 MHzKE0BMV-11APRS/DF/Cutter
144.34 MHzKC0D-12APRS/DigiSlotted at 20 and 50

EOSS-272 Lite

Added for an exempt flight of COSCG payloads.

Launch Time 0830 Mountain Time

Balloon Type: 
1500g Kaymont
8.5 ft Orange with Mech release and cutter
145.765 MHzKC0D-14APRS/Cutter/DF
144.34 MHzKC0D-11APRS/DigiSlotted 05 and 35

Preflight Net:

  • 449.225 MHz RMHAM Repeater (141.3 Hz Tone) 8 pm MDT preceding night
  • 146.940 MHz (103.5 HZ Tone) RMRL Repeater if the RMHAM 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), North Flights
  • 448.450 MHz PPFMA (100.0 Hz Tone), South Flights
  • 446.100 MHz Balloon 1 Field Simplex
  • 446.150 MHz Balloon 2 Field Simplex
  • 446.200 MHz Balloon 3 Field Simplex (if needed)
  • 446.275 MHz Car to Car drive out
  • 146.550 MHz Backup field simplex

Launch Site Simplex: 446.050 MHz

HF - Possible ops: 7.235 LSB

Tactical Calls: 
Tracker Tactical Calls
AlphaWAØGEH, KCØD, KEØNDWMarty, MarkXmit 10:03,Tracker Coordinators
BravoKBØYRZChris, JenXmit 10:07, Backup Alpha, Tracker
CharlieKDØSEMDaveXmit 10:12, Launch Team, Trackers
DeltaKØSCCStephenXmit 10:17, Launch Team, Trackers
EchoKCØRPSJimXmit 10:22, Tracker
FoxtrotKE7KCKTomXmit 10:27, Flight Coordinator, Tracker
GolfKØLOBJim, JanaeXmit 10:32,Tracker
HotelXmit 10:37
IndiaN6BAJeffXmit 10:42, Tracker
JulietKCØLJohnPredictions remote from Texas
KiloNØNDMLarryXmit 10:47, Launch Team. Tracker
LimaKEØNDWAnupXmit 10:52, Launch, Tracking with his team
WhiskeyKDØNRYChrisCOSGC Director, Tracker
TR Breakfast: 
TR Breakfast at 6:30, Denny's Limon, CO. Leave for recovery site 7:15, Launches start at 7:30. Wear warm clothes, Roads may be wet from Friday rain/snow. For those using TrackPoint 1.44, check the Tactical Calls for your beacon times. Example Xmit 10:03 means transmit every 10 minutes at 3 seconds pat the hour. This should keep us from doubling with each other and more importantly the balloons. See you on the net tonight. Predicted landing site is 105.7, 29.8