Flight Recap for EOSS-179

03/27/2013 13:50 (CDT): minor edits

Recap Maps | Frequencies | Flight Systems | Payload Config | I-Gates | T & R | Text Recaps | Photos | Audio | Video | Data | Charts

Flight Coordinator: Rob Wright

LAUNCH DATE: July 7th, 2012
LAUNCH TIME: 07:39 am MDT (13:39 UTC)
LAUNCH SITE: Briggsdale, CO (driving directions)

Pre-flight Prediction and Actual Tracks

E0SS-179 AE0SS-11

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 (NO DESCENT TRACK)
Prediction and Actual tracks made with Balloon Track

Maps by Google Earth

Launch Site - Crow Valley Park
Launch Point: 40.64443� lat.   -104.33895� long.
Grid: X=25.28 Y=12.36
Ascent Rate: 1329 feet per minute
Descent Rate: 950 feet per minute
Altitude: 4840 feet
Predicted Landing Site
Landing Point: 40.88484� lat.  -104.62626� long.
Grid: X=10.2 Y=29.0
Altitude: 4500 feet
Flight Time: 128 Minutes
Bearing: 317.9� True
Range: 22.4 Mi.
Actual Landing Site
Landing Point: 40.80965� lat.  -104.76524� long.
Grid: X=2.9 Y=23.8
Bearing: 297.2� True
Range: 25.052 Mi.
Difference from Predicted to Actual Landing Site
Bearing: 234.5� True
Range: 8.921 Mi.

Final Pre-Flight Prediction is available here
Prediction History is available here

EOSS Flight Day Frequencies:

Tracking and Recovery Frequencies

Preflight Net:

  • 147.225 MHz 8 pm MDT preceding night
  • 146.640 MHz will serve as a backup frequency

Tracking and Recovery Operations

  • Repeaters 
    • 449.450 MHz (103.5 Hz Tone) RMRL
  • Field Simplex Frequencies  
    • 446.100 MHz simplex for field recovery operations
    • 446.150 MHz simplex for field recovery operations (Backup)
    • Note: Some radios insist on incorrectly placing a negative 5 MHz offset when selecting frequencies from the simplex portion of the 70 CM band. Check your radio and if this is the case. Consider programming in this simplex frequency to a memory channel as some radios have demonstrated the annoying habit of re-inserting the offset if you momentarily shift to a repeater then return to the simplex freq. Check the operation of your radio on this simplex freq to be ready for however your radio behaves.
    • 146.550 MHz Backup field simplex
  • 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.


  • Launch Site Simplex
    • 146.550 MHz


EOSS-179 Balloon Payload Frequencies

  • Beacons
    • 147.420 MHz
    • CW ID: K0SCC
  • 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
  • 147.420 MHz
  • ID: K0SCC-11


Flight Systems: 


Balloon Manufacturer Totex
Balloon Type latex
Balloon Size 3000 g
Neck Load 18.6 Lbs.
Neck Lift 22.4 Lbs.
Ascent Rate 1329 fpm estimated
Descent Rate 950 fpm estimated
Parachute 10 ft.


Payload Configuration:

Payload Experiment Designer

Pre-Collegiate Development Program - A new program offered by University of Colorado at Boulder to generate interest and enthusiasm in Middle and High School students in their pursuit of a college education and degree. This should be an exciting and fun outing for them and EOSS personnel as well.

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 (listed alphabetically)

EOSS-179, AE0SS-11

  • AE0SS - Nick Hanks at the Ground Station
  • K0ANI - Larry Cerney, Denver, CO
  • KB0TVJ-4 - Russ Chadwick, Boulder, CO
  • N0EB-1 - Richard Beggs, Thornton, CO
  • N0IX-12 - Doug Gentges, Mobile iGate
  • N0PSJ - Christopher Holmes, Arvada, CO
  • N0YXV-1 - Stanley Coleman, Grand Island, NE

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.

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 (webmaster@eoss.org) 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 findu.com 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  

We will NOT be going to Ft. Morgan for breakfast as the predictions have moved west.  So the breakfast will meet at Johnson�s Corner:

  • Johnson�s Corner at Intersection of I-25 and Exit 254
  • Meet at 5:45
  • Leave by 6:15  for recovery ops  

Tentatively we will travel north on I-25 to Exit 293, CR 126, 
CR 126 east to Highway 85,
Highway 85 south to CR 122,
East on CR 122 and disperse along the road length, 5-10 miles



Location Grid X Grid Y
West Intersection Highway 14 & 71 60 10
Grid Test      41.25� N,  104.25� W 30.3 54


Tactical Call Signs

Tactical Callsign Name Notes
Alpha WA0GEH, KC0D Marty and Mark Tracking and Recovery
Bravo KC0UUO, N0IX Rob, Doug Flight Coordinator
Charlie W9CN Mike and Miles Trackers
Delta K0SCC Stephen and Parker Trackers
Echo N0NDM Larry Launch and Grab
Foxtrot AC0RY and KD0PRJ Brian and Benjamin with  Bernadette and Lindsay in other vehicles Colorado Space Grant
Golf K5JFD John Texas Tracker

Text Recaps


Launch Site


Recovery Operations


not recorded










EOSS-179 AE0SS-11


 Spread Sheets

Mapping Files