Recap of EOSS-146

03/02/2012 15:50 (CDT): Finished, but additional submissions always welcome

Recovery Vehicles on Scene

by Miles Pappas


Special DF Flight Information

Flight Coordinator: Larry Cerney, 

LAUNCH DATE: September 26th, 2009 (wx delay +7)
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


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=31.27 Y=87.43
Ascent Rate: 1324 feet per minute
Descent Rate: 800 feet per minute
Altitude: 5205 feet
Predicted Landing Site
Landing Point: 38.73719� lat.  -103.80895� long.
Grid: X=44.2 Y=27.1
Altitude: 4500 feet
Flight Time: 131 Minutes
Bearing: 168.2� True
Range: 61.6 Mi.
Actual Landing Site
Landing Point: 38.86902� lat.  -103.7873� long.
Grid: X=45.3 Y=36.2
Bearing: 165.0� True
Range: 53.046 Mi.
Difference from Predicted to Actual Landing Site
Bearing: 7.3� True
Range: 9.176 Mi.

Payload Experiment Designer

  • EOSS - This is a DF training and fun flight

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

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
    • 448.450 MHz PPFMA (100 Hz Tone) (southerly tracking flights)
    • 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


EOSS-146 Balloon Payload Frequencies

DF Beacons

  • Beacons
    • 145.600 MHz
      • CW ID: AE0SS
    • 445.975 MHz
      • CW ID: W5VSI
  • APRS
    • SSID: NN0RPM-11

Flight Systems:


Balloon ManufacturerKaysam
Balloon Typelatex
Balloon Size1200 gram
Neck Load7.8 lbs.
Neck Lift10.4 lbs
Ascent Rate1324 fpm estimated
Descent Rate1000 fpm estimated
Parachute5 ft.
Peak Altitudedetermined after flight
Launch Conditionsdetermined at launch


Payload Configuration:

Internet Gateway Stations:

as seen on Findu.Com



  • K0ANI-14 - Larry Cerney, Mobile Chase
  • KB0TVJ - Russ Chadwick, at the launch site
  • N0EP-1 - Richard Beggs, Thornton, CO
  • 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

DF Buddy

The DF Buddy is a "virtual" station that will give cross bearings to the balloon during the flight thus enabling individuals to DF the payload ALONE using triangulation with the DF buddy vector information. Below are three locations where these reports may be generated from.

Location Name and DescriptionLatitudeLongitude
Kiowa, Colorado - Intersection of SR 86 & CR 45 in downtown Kiowa 39.34657 N 104.46346 W
Calhan, Colorado - Intersection of US 24 & Yoder Rd in downtown Calhan. Yoder Rd. turns into Calhan Highway further out of town 39.03605 N 104.29358 W
Rush, Colorado - Intersection of Rush Rd and  SR 94 38.84013 N 104.09213 W




Grid X

Grid Y

Punkin Center(Intersection of SR 94 and SR 71)



Test Plot (  )  


Tactical Call Signs. 







Marty, Mark

Tracking and Recovery Coordinator



Jim and George




Mike & Miles

Contestant ?




Contestant ?

EchoN0NDMLarryContentant ?




Cooperative Observer from Glenwood Springs

GolfKD0IRS, KD0IRRDave, KathyCooperative Observer
PapaK0SCC, N0LPSteve, Nick and DarylTeam Peregrine
DF BuddyIntersection of SR-86 and CR-45 in downtown Kiowa Set at Kiowa, grid 8.91, 69.14


Text Recaps



Launch Site


SamCam2 Airborne In Flight

Ascent Phase

Descent Phase

Recovery Site


recorded but not yet edited


Launch of EOSS-146

by Nick Hanks, N0LP


Time Lapse from SamCam

processed by N0KKZ






Spread Sheets

Mapping Files