Recap of EOSS-153

03/02/2012 15:50 (CDT): Photos from W5VSI and WA0GEH added.

by Marty Griffin, WA0GEH

Upward Bound students with their successfully recovered payloads.

Flight Coordinator: Rob Wright (

LAUNCH DATE:July 10th, 2010 (wx delay +1 day)
LAUNCH TIME: 07:10 MDT (13:10 UTC)
LAUNCH SITE: Deer Trail, Colorado (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


Looking Southwest
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 - Deer Trail
Launch Point: 39.61137� lat.   -104.04255� long.
Grid: X=-13.86 Y=31.07
Ascent Rate: 1328 feet per minute
Descent Rate: 950 feet per minute
Altitude: 5205 feet
Predicted Landing Site
Landing Point: 39.46133� lat.  -102.9848� long.
Grid: X=42.5 Y=20.7
Altitude: 4500 feet
Flight Time: 127 Minutes
Bearing: 100.1� True
Range: 57.3 Mi.
Actual Landing Site
Landing Point: 39.50023� lat.  -103.42245� long.
Grid: X=19.2 Y=23.4
Bearing: 102.9� True
Range: 33.894 Mi.
Difference from Predicted to Actual Landing Site
Bearing: 276.7� True
Range: 23.478 Mi.

EOSS Flight Day Frequencies:

Tracking and Recovery Frequencies

  • Preflight Net:
    • 147.225 MHz 8 pm local time the evening preceding the flight
      • 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) Primary Recovery Ops
    • 448.450 MHz PPFMA (100.0 Hz Tone) Backup Recovery Ops
    • 147.060 MHz (103.5 Hz Tone)
      • Genoa repeater
    • 146.895 MHz (PL 103.5 Hz Tone)
      • Flagler
    • 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.
    • 7.228 MHz HF a possibility

EOSS-153 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

Flight Systems:


Balloon Manufacturer Totex
Balloon Type latex
Balloon Size 3000 gram
Neck Load 25.9 lbs.
Neck Lift 30.8 lbs
Ascent Rate 1329 fpm estimated
Descent Rate 950 fpm estimated
Parachute 10 ft.
Peak Altitude determined after flight
Launch Conditions determined at launch


Payload Configuration:

Payload Experiment Designer

CU SGC flights for Upward Bound

Internet Gateway Stations:

as seen on Findu.Com

EOSS-153, AE0SS-11

  • K0ANI - Larry Cerney, Denver, CO
  • KB0TVJ - Russ Chadwick, at the launch site
  • KB0TVJ-4 - Russ Chadwick, Boulder, CO
  • KC0D-3 - Mark Patton, Foxfield, CO
  • KC0VJE - Louis Perley, Nunn, CO
  • N0IX-12 - Doug Gentges, Tracker/iGate
  • N0PSJ - Christopher Holmes, Arvada, 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 29 i-gates.

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 

Quick Links are a new method being used to connect payloads together on the flight string. SEE THIS PAGE on instructions on how to properly open them upon recovery enabling easy transport of shorter lengths of the payload train.





Grid X

Grid Y

Last Chance



Test case  40� 30'  N,  103� 45' W




Tactical Call Signs







Marty, John Dinneen

Tracking and Recovery Coordinator







Mike, Miles




Steve, and Parker

Tracker with AIO/DIO



Darren, Sam








Larry and Benjie

Balloon Meister and Trackers

Golf N0IX, KC0UUO Doug and Rob Tracker and President




Flight Travel Coordinator




EOSS Liaison and Student Caravan Guide


Text Recaps



Launch Site

Recovery Site


recorded but not yet edited




EOSS-153, AE0SS-11


Spread Sheets

Mapping Files