Recap of EOSS-131

03/02/2012 15:50 (CDT): Removed Prep Template (finished)

Flight Coordinator: Nick Hanks, N0LP ( I'll forward your email to Nick

LAUNCH DATE: August 2nd, 2008
LAUNCH TIME: 07:43 CDT (12:43 UTC)

Pre-flight Prediction and Actual Track

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

Looking WNW


Looking SE

Launch Site - gpsl2008 1
Launch Point: 39.24828� lat.   -94.40845� long.
Grid: X=42.79 Y=20.57
Ascent Rate: 1000 feet per minute
Descent Rate: 950 feet per minute
Altitude: 900 feet
Predicted Landing Site
Landing Point: 38.66274� lat.  -94.05261� long.
Grid: X=62.3 Y=-19.9
Altitude: 900 feet
Flight Time: 139 Minutes
Bearing: 154.6� True
Range: 44.7 Mi.
Actual Landing Site
Landing Point: 38.84922� lat.  -94.24883� long.
Grid: X=51.6 Y=7.0
Bearing: 162.7� True
Range: 28.853 Mi.
Difference from Predicted to Actual Landing Site
Bearing: 320.7� True
Range: 16.658 Mi.

No Prediction History

EOSS Flight Day Frequencies:

EOSS-131 Balloon Frequencies

  • Beacons
    • 145.600 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
  • 147.555 MHz
  • ATV
  • 426.250 MHz AM
  • ID: AE0SS
  • GPS Overlay
  • Cross Band Repeater
  • 445.975 MHz Uplink
  • 147.555 MHz Downlink
  • ID: W0WYX CW and Robot

Flight Systems:


Balloon Manufacturer Kaysam
Balloon Type latex
Balloon Size 1200 gram
Neck Load 11.9 lbs.
Free Lift % 25%
Ascent Rate 1190 fpm avg. to burst
Descent Rate 1213 fpm avg. below 10K feet
Parachute 5 ft
Peak Altitude 88,759.52 ft. ASL
Launch Conditions calm


Payload Configuration:

Tracking and Recovery Info: 


Location X Y
Fairfield Inn (39.23999 N, -94.460695 W) 40 20
Touchdown (see Prediction Page)


Tactical Callsigns


Call sign






Tracking and Recovery Coordinator








didn't make it







Marcia and Benjie












Rob and KJ

India K0SCC Steve, Daryl and Nick  

Internet Gateway Stations:

as seen on Findu.Com

For AE0SS-11

  • AB0XK - Robert Roe, Russell, KS
  • KC0UUO - Rob Wright, GPSL attendee (mobile igate)


  • WK0Q-1 - Allen Gates, Gilman City, MO

Special thanks go out to Robert, AB0XK a regular igater for GPSL events and to Allen. I really didn't expect to find any packets on Findu for W0WYX as it was on a frequency all by itself. But apparently Allen discovered it and igated the landing sequence. That was fantastic. Thanks! Backup like that can really help find stuff when you get a few local APRS failures. Thankfully we didn't need it but it is always appreciated and a welcome addition to the flight. Robert, I'm betting you were on the xband trying to get to us. The tracking effort (all our personell) for some reason decided to move to a repeater, actually it wasn't for some reason, it was the ability to reduce the number of radios needed for operations from three to two. Repeaters only require one band/radio the xband requires two bands. So we were remiss about operating through the xband. Sorry about that. Next year we're going to Lawerence and I'm hoping we can bring along a person who can act as a ground station and monitor everything, record it all and operate the xband. We'll see if we can scare up that individual.

Anyway, thanks to the folks who igated us from non standard APRS frequencies. Appreciated!

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.


GPSL 2008


Saturday Night Dinner

  • by Marty Griffin, WA0GEH

Launch Site

  • by Rick von Glahn, N0KKZ
  • by Sharon Griffin
  • by KJ Wright


  • by Sam-Cam

Recovery Area

  • by Rick von Glahn, N0KKZ
  • by Sharon Griffin
  • by KJ Wright


no audio for this flight


CLICK HERE to go to YouTube page for this video

Video by Marcia DeBell, KC0SOW and Rick von Glahn, N0KKZ

If you go directly to YouTube to view this there is now a link just below the window in which the video appears allowing you to select "watch this video in high quality". This is a much better version of the video and if you have the bandwidth worth the extra step.


ATV Received by KB0YRZ

An excellent capture of the ATV. While rough in spots, check out the landing. You can see the Pappas team (Mike and Miles) watching from beside their car as the payload drops into a tree.





Spread Sheets

Mapping Files


  • by Rick von Glahn, N0KKZ (later)