Recap of EOSS-156

03/02/2012 15:50 (CDT): Recap maps and data posted

Flight Coordinator: Russ Chadwick (

LAUNCH DATE: Oct 16th, 2010
LAUNCH TIME: 7:10 am MST (13:10 UTC)
LAUNCH SITE: Windsor, Colorado (Click Here for directions)

Pre-flight Prediction and Actual Tracks


Blue = Actual Track
Green = Predicted Ascent Phase
Red = Predicted Descent Phase

Map made with MapPoint
Prediction made with Balloon Track


Green Track = Ascent
Red Track = Descent
Prediction and Actual tracks made with Balloon Track

Maps by Google Earth

Map Files available in the Data Section below

Launch Site - Windsor
Launch Point: 40.47367� lat.   -104.96233� long.
Grid: X=-17.42 Y=15.57
Ascent Rate: 1328 feet per minute
Descent Rate: 950 feet per minute
Altitude: 4931 feet
Predicted Landing Site
Landing Point: 40.47488� lat.  -104.02532� long.
Grid: X=31.8 Y=15.7
Altitude: 4500 feet
Flight Time: 110 Minutes
Bearing: 89.6� True
Range: 49.2 Mi.
Actual Landing Site
Landing Point: 40.42297� lat.  -104.2418� long.
Grid: X=20.4 Y=12.1
Bearing: 95.1� True
Range: 38.02 Mi.
Difference from Predicted to Actual Landing Site
Bearing: 252.6� True
Range: 11.927 Mi.

EOSS Flight Day Frequencies:

Tracking and Recovery Frequencies

  • Preflight Net:
    • 147.225 MHz 8 pm MDT preceding Saturday night
      • 145.160 MHz simulcast in the Springs
    • 146.640 MHz will serve as a backup frequency
  • Tracking and Recovery Operations
    • 449.450 MHz RMRL (103.5 Hz Tone)
    • 146.550 MHz simplex (same simplex for field and launch ops)
    • Repeater Coverage Pages - Listings of all repeaters available in the expected flight areas.
    • There may be FRS operations see THIS PAGE for a list of channel numbers and their associated UHF Frequencies.

EOSS-156 Balloon Payload Frequencies

  • Beacons
    • 147.555 MHz
      • CW ID: AE0SS
  • APRS
    • 144.340 MHz
      • ID: AE�SS-11
      • DIGI: EOSS
      • Node: BALNOD
      • APRS Time Slotted Every 30 seconds at 0:00 and 0:30
        • power up at 58 seconds past the GPS minute to properly slot telemetry
      • Telemetry once a minute
      • Sample Data

Video Might Be available, check

Flight Systems:  


Balloon ManufacturerTotex
Balloon Typelatex
Balloon Size3000 g
Neck Load11.575 Kg
Neck Lift13.754 g
Ascent Rate1329 fpm estimated
Descent Rate950 fpm estimated
Parachute10 ft.
Peak Altitudedetermined after flight
Launch Conditionsdetermined at launch


Payload Configuration:  

Payload Experiment Designer

NOAA AirCore and associated sensors

Experimenters are welcome to submit websites for linking or overviews which I will post on a page on the EOSS website.

Internet Gateway Stations:

as seen on Findu.Com

EOSS-156, AE0SS-11

  • KB0TVJ-4 - Russ Chadwick, Ground Station
  • KB0TVJ - Russ Chadwick, Boulder, CO
  • KC0D-3 - Mark Patton, Foxfield, CO
  • N0EB-1 - Richard Beggs, Thornton, CO
  • N0IX-12 - Doug Gentgas, Tracking and Recovery team mobile i-Gate
  • N0ZUQ-1 - Clifford Mikkelson, Windsor, CO

EOSS wishes to express our sincere appreciation to the stations above who iGated the balloon APRS telemetry onto the internet. Did you know I publish predictions for i-gates? I keep a list of everyone who has ever i-gated an EOSS balloon flight. You're all in the list so if you're wondering when the balloon will pop up over your horizon, check out this page for future flights.  Currently predictions are being made for 30 i-gates.

Welcome to Clifford, N0ZUQ from Windsor and Doug, N0IX from where ever the balloon is to the i-gate team. Clifford, I've added your FCC DB home location to the iGate prediction database. You will appear there from now on.

We are relying heavily on real time position information available on the net to allow the FAA controllers to have up to the minute location data to assist them in air traffic control.

Redundant stations for the balloon iGating provide excellent coverage. If you are able to iGate we invite you to join the Internet Gateway Team. Contact me ( to be put in touch with the coordinator. By joining the team, you are giving peace of mind to the iGate coordinator for that flight. He knows you'll be there and he can rely on you.

Naturally, anyone can iGate data onto the net and even if you aren't a member of the team we will welcome your contribution to the internet based tracking effort. If you callsign appears on the log, you'll be shown as a contributing station as those above are.

Having more than one station covering each APRS beacon means that should a station drop out momentarily, the others can often maintain the data flow.

Thanks again guys! The FAA (and EOSS) are very grateful for your assistance in this endeavor.

Future I-Gaters:

Check out the EOSS I-Gate page for information on how to participate and why we need you.

Current I-Gate Stations:

Guys, the prediction program used to determine the track of the balloon prior to flight can now output a prediction for the Rise, Closest Approach or maximum elevation, and Set of the balloon for each of your stations. I have posted a prediction page for stations that I have been able to discover geographic coordinates. See the I-Gate prediction page for an example. The page will not be updated daily, however, it will be updated the evening prior to flight for I-gate planning purposes.

I have often been asked by iGaters when they should expect to either start receiving signals (AOS) or expect to see those signals disappear (LOS). This prediction page should answer all those questions for you.

Tracking and Recovery


  • Johnson's Corner (I-25 at exit 254 on the east side of the highway)
  • Arrive: 05:45 to 06:00
  • Depart: 06:30

If you want breakfast, trackers will meet at Johnson�s Corner (I-24 Exit 254, east side) between 05:45 and 06:00.  Plan to leave for the launch site at 6:30.  Otherwise trackers can meet at the launch site or in the predicted landing area.  Mark and I will bypass breakfast and go directly to the predicted landing area.



LocationGrid XGrid Y
Hwy 14 & 71 West5025
Test Location  41� 15' N,  103� 15 W72.169.0


Tactical Call Signs

AlphaWA0GEH, KC0DMarty, MarkTracking and Recovery Coordinator
BravoKB0YRZChrisTracker, Tracking Recovery Coordinator
DeltaN0IXDougTracker, EOSS.TV
GolfN0NDM & W0CBHLarry & BenjieLaunch Coordinator
KiloKC0VJELouisTracker, Sunday Only

Text Recaps



Launch Site

Recovery Site




EOSS-156 Filling

by Nick Hanks, N0LP


EOSS-156 Launch

by Nick Hanks, N0LP



EOSS-155, AE0SS-11


 Spread Sheets

Mapping Files