Announcement of EOSS-156

Flight Coordinator: Russ Chadwick (

LAUNCH DATE: Oct 16th, 2010
LAUNCH TIME: 7:10 am MST (13:10 UTC)
LAUNCH SITE: Windsor, Colorado (Click Here for directions)

EOSS Flight Day Frequencies:

Tracking and Recovery Frequencies

  • 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 Operations
    • 449.450 MHz RMRL (103.5 Hz Tone)
    • 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.

EOSS-156 Balloon Payload Frequencies

  • Beacons
    • 147.555 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

Video Might Be available, check

Flight Systems:  


Balloon Manufacturer Totex
Balloon Type latex
Balloon Size 3000 g
Neck Load 11.575 Kg
Neck Lift 13.754 g
Ascent Rate 1329 fpm estimated
Descent Rate 950 fpm estimated
Parachute 10 ft.
Peak Altitude determined after flight
Launch Conditions determined at launch


Payload Configuration:  

Payload Experiment Designer

NOAA AirCore and associated sensors

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

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.

Tracking and Recovery


  • Johnson's Corner (I-25 at exit 254 on the east side of the highway)
  • Arrive: 05:45 to 06:00
  • Depart: 06:30

If you want breakfast, trackers will meet at Johnson�s Corner (I-24 Exit 254, east side) between 05:45 and 06:00.  Plan to leave for the launch site at 6:30.  Otherwise trackers can meet at the launch site or in the predicted landing area.  Mark and I will bypass breakfast and go directly to the predicted landing area.



Location Grid X Grid Y
Hwy 14 & 71 West 50 25
Test Location  41� 15' N,  103� 15 W 72.1 69.0


Tactical Call Signs

Tactical Callsign Name Notes
Alpha WA0GEH, KC0D Marty, Mark Tracking and Recovery Coordinator
Bravo KB0YRZ Chris Tracker, Tracking Recovery Coordinator
Charlie W9CN Mike Trackers
Delta N0IX Doug Tracker, EOSS.TV
Echo KC0RPS Jim Tracker
Foxtrot KB0LP Dave Tracker
Golf N0NDM & W0CBH Larry & Benjie Launch Coordinator
Hotel WA9WWS Don Tracker
Kilo KC0VJE Louis Tracker, Sunday Only