Announcement of EOSS-122/123

LAUNCH DATE: October 27, 2007

  • EOSS-122 - 07:30 am MDT (13:30 UTC) AirCore
  • EOSS-123 - 08:15 am MDT (14:15 UTC) Bacteriological Sampler

LAUNCH SITE: Windsor, CO (directions)

Pre-Flight Information

On Air Nets

Check into the weekly EOSS net every Tuesday evening, except the 2nd Tuesday of the month when we hold our face to face meetings.

  • Tuesdays at 8 PM (20:00) Local time
    • 147.225 MHz 107.2 Hz tone CRA Repeater (Denver)
    • 145.460 MHz 107.2 Hz tone CRA Repeater (Boulder) manual link required (link may be unavailable)
    • 145.160 MHz 107.2 Hz tone CRA Repeater (Colorado Springs) full time link active
    • 146.640 MHz backup DRL Repeater (Denver only)

Pre-Flight Coordination Net

The evening prior to flight we hold a coordination net at 20:00 Local Time to assign the grid information and tactical callsigns. Any last minute information, launch time changes, launch location changes, maybe even a cancellation will be announced on this net.

  • Preflight Net:
    • 147.225 MHz 8 pm MDT preceding Saturday night
      • 145.160 MHz simulcast in the Springs
    • 146.640 MHz will serve as a backup frequency

Tracking and Recovery Team
Flight Day Breakfast

  • Ft. Morgan McDonalds
  • 6 am start
  • Depart to begin recovery ops at 6:45 am

EOSS Flight Day Frequencies:

Global Frequencies

EOSS-122 Balloon Frequencies

  • Beacon
  • APRS
    • 144.340 MHz
      • ID: AE�SS-11
      • DIGI: EOSS
      • Node: BALNOD
      • APRS Time Slotted Every 30 seconds at 0:00 and 0:30
      • Telemetry once a minute
        • power up at 58 seconds past the GPS minute to properly slot telemetry
      • Sample Data

EOSS-123 Balloon Frequencies

  • Beacon
    • 445.975 MHz
      • ID: K�ANI in CW
  • APRS
    • 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
  • 445.975 MHz
  • ID: K�ANI-11


Radio Coverage:

Green, you should be able to work the payload systems.

Red, is the border of the received signal. Red appears jittery because it is depicted topographically. Thus, the red dots on the eastern half of the map but well within the maximum distance show hilly terrain behind (east) which reception is not possible.

This is a generic 95,000 ft ASL coverage map for flights that depart from the vicinity of our launch site. Flight day coverage may vary depending on upper air winds.

Flight Systems:


Balloon Manufacturer Kaysam
Balloon Type latex
Balloon Size 3000 gram
Payload 24.2 lbs.
Free Lift % calculated at fill
Ascent Rate 1100 fpm estimated
Descent Rate 950 fpm estimated
Parachute 10 ft
Peak Altitude determined after flight
Launch Conditions determined at launch



Balloon Manufacturer Kaysam
Balloon Type latex
Balloon Size 3000 gram
Payload 25.9 lbs.
Free Lift % calculated at fill
Ascent Rate 1100 fpm estimated
Descent Rate 950 fpm estimated
Parachute 10 ft
Peak Altitude determined after flight
Launch Conditions determined at launch


Payload Configuration:

Tracking and Recovery Info:

Data for 10/27/07


Location X Y
Rt 71 & 14 (West Intersection) 10 60
Touchdown (see Prediction Page)


Tactical Callsigns

Tactical Callsign Name Notes
Alpha WA0GEH and N0AUS Marty and Al Tracking and Recovery Coordinator
Bravo KC0RPS and W0NFW Jim and George  
Charlie KC0VJE Louis  
Delta WB0DKT, KC0ZIE, KC6HXM, WB6DKF Glenn,  Darren, Sam, Loren and Heather  
Echo KC0UUO Rob and Bob  
Foxtrot KB0QQW Chris and Caleb, Jeannine  
Golf KB0YRZ Chris  
Hotel N0NDM and W0CBH Larry and Benjie  
India AE0SS Nick Ground Station
  K0ANI Larry  


Internet Gateway Stations:

Future I-Gaters:

EOSS is always in need of I-Gate stations. Check out the EOSS I-Gate page for information on how to participate and why we need you.

Current I-Gate Station:

If you are present at your iGate during the flight try and monitor the tracking and recovery frequency. The ground station likes to check the frequency prior to launch to find out if any stations are out there ready to igate the traffic onto the net for the FAA to monitor.

The prediction program used to determine the track of the balloon prior to flight can now output a prediction for the Rise, Closest Approach, 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.

Your Log Files

Our technical committee members would also request you open a log file and record all the packets you hear and forward onto APRS-IS. Whenever there is a technical failure of a package it is always helpful to have the most complete dataset possible to attempt to determine the cause of failure and possible fixes. After a flight send your data files to me (webmaster) and I will distribute them to the appropriate payload builders. They appreciate these logs even if all goes fine during a flight.

Experimental Systems

We're flying two experiments

EOSS-122 - NOAA AirCore� Atmospheric Sampler

Recovery Crews - There is a valve at the end of this tube with a lever. If the lever is aligned or parallel with the tube, it is open. If it is perpendicular or crosswise to the tube it is closed. The first recovery crew person to approach the AirCore should immediately close the valve sealing the air sample inside.  Immediately report that you have sealed the experiment to station ALPHA, net control. This is valuable data for the experiment.

14 lbs of AirCore� from a previous flight


If you are interested visit: - for a global overview of the Global Monitoring Division of NOAA. - for the overview of Carbon Cycle in the atmosphere and ... - for current trends.

NOAA, updates detailing any changes to the experiment are most welcome as are links to NOAA pages covering this elegant device.

See our previous flight announcement for additional details about this system.

EOSS-123 - Atmospheric Bacteriological Sampler

No detailed information at this time

note: customers are welcome to submit detailed synopses of their flights or web links to their own web sites.