Flight Recap for EOSS-189

07/16/2013 11:47 (CDT): Added PCDC Video

Submit photos and data to:

URL: ftp.eoss.org
username: photos@eoss.org
password: photos

For details on how to use FTP and general information about sending in materials see:

Mileage Compensation Form

This flight may be a compensated event so fill out the form for your reimbursement

Flight Coordinator: Thomas Londrigan - KE7KCK

LAUNCH DATE: June 27th, 2013 (wx delay +1 day)
LAUNCH TIME EOSS-187: 7:10 am MDT (13:10 UTC)
LAUNCH SITE: Deer Trail, CO (driving directions to Deer Trail Launch Site)  

Pre-flight Prediction and Actual Tracks

note: GPS Lock at final approach and touchdown problematic.

E0SS-189 KC0YA-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 - Deer Trail
Launch Point: 39.61137� lat.   -104.04255� long.
Grid: X=21.38 Y=62.43
Ascent Rate: 1329 feet per minute
Descent Rate: 950 feet per minute
Altitude: 5205 feet
Predicted Landing Site
Landing Point: 39.26147� lat.  -104.11767� long.
Grid: X=17.5 Y=38.3
Altitude: 5000 feet
Flight Time: 136 Minutes
Bearing: 189.4� True
Range: 24.5 Mi.
Actual Landing Site
Landing Point: 39.30214� lat.  -104.24595� long.
Grid: X=10.6 Y=41.1
Bearing: 207.0� True
Range: 23.948 Mi.
Difference from Predicted to Actual Landing Site
Bearing: 292.3� True
Range: 7.406 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 (107.2 HZ Tone) CRA Repeater, 8 pm MDT preceding night 
  • 146.940 MHz (103.5 HZ Tone) RMRL Repeater if the CRA machine is down
  • 146.640 MHz will serve as a backup frequency

Tracking and Recovery Operations  

  • Front Range and out east 
    • 448.450 MHz PPFMA (100 Hz Tone) 
  • Field Simplex Frequencies   
    • 446.100 MHz simplex for field recovery operations
    • 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.

Ground Stations Frequencies

  • Launch Site Simplex
    • 146.550 MHz
  • HF - Possible ops
    • 7.235 LSB


EOSS-189 Balloon Payload Frequencies  


  • 147.420 MHz
    • CW ID: K0SCC-11


  • 144.340 MHz
    • ID: KC0YA-11
    • DIGI: EOSS
    • Node: BALND2
    • APRS Time Slotted Every 30 seconds at 0:15 and 0:45
      • power up at 13 seconds past the GPS minute to properly slot telemetry
    • Telemetry once a minute
    • Sample Data
  • 147.420 MHz 
  • ID: K0SCC-11
  • slotted 15 and 45 after the minute


Flight Systems: 


Balloon Manufacturer Totex
Balloon Type latex
Balloon Size 3000 g
Neck Load 15.4  Lbs.
Neck Lift 18.7  Lbs.
Ascent Rate 1329 fpm estimated
Estimated Burst Alt 105,000 ft. ASL
Descent Rate 950 fpm estimated
Parachute 10 ft.


Payload Configuration: 

Payload Experiment Designer

PCDC = Pre-Collegiate Development Program

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-189, KC0YA-11

  • K0JSC-3 - Jeffrey Carrier, Ca�on City
  • KB0TVJ  - Russ Chadwick, Launch Site
  • KD0MBL - Heal Tew, Pueblo, CO
  • N0PSJ - Christopher Holmes, Arvada, CO
  • W9CN - Mike Pappas, Mobile?

EOSS-189, K0SCC-11

  • AE0SS - Nick Hanks, Launch Site
  • K0SCC - Stephen Meer, Mobile
  • KB0TVJ-4  - Russ Chadwick, Launch Site
  • KC0D - Mark Patton, Centennial, CO
  • KD0MBL - Heal Tew, Pueblo, CO
  • N0IX-12 - Doug Gentges, Mobile Igate

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 Operations  


Breakfast will be at Patty Anns Caf� on the West side of Kiowa.  They open at 6:00 and are expecting us.

Google Map of the Eatery

A Yelp Review


Tracking and Recovery Grid

TrackPoint Grid Reference Location

Grid X

Grid Y

Punkin Center



Grid Test   N 39.500, W103.500



Tactical Call Signs


Call sign





Marty, Mike Morgan

Tracking and Recovery Coordinator, Pella Dude




Tracking, Recovery



Mike, John, Miles

Tracking, Recovery




Co-Flight Coordinator, Tracking, Recovery




Co-Flight Coordinator, Tracking, Recovery



Rob, Doug, Alan

Tracking, Recovery




Tracking, Recovery




Tracking, Recovery



Dave, Cheryl

Tracking, Recovery



Stephen, Whitney

Tracking, Recovery




Colorado Space Grant



Chris Koehler

Colorado Space Grant


Text Recaps


now hosted at Flickr


recorded but not edited or uploaded





Recap maps will be available upon receipt of the KPC3 Log

EOSS-189 KC0YA-11


 Spread Sheets

Mapping Files


EOSS-189 K0SCC-11