Flight Announcement for EOSS-165

Flight Coordinator: Rob Wright (kc0uuo@eoss.org)

LAUNCH DATE: June 11th, 2011 (wx delay +1 day)
LAUNCH TIME: 07:10 am MDT (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 night
    • 146.640 MHz will serve as a backup frequency
  • Tracking and Recovery Operations
    • 449.450 MHz (103.5 Hz Tone) north track RMRL
    • 146.775 MHz (114.8 Hz Tone) Cheyenne
    • 147.165 MHz (114.8 Hz Tone) Albin
    • Field Simplex Frequencies
      • 446.100 MHz simplex
      • 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.
  • 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-165 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 http://www.eoss.tv

Various Online Live Tracking Pages

Flight Systems: 


Balloon Manufacturer Totex
Balloon Type latex
Balloon Size 3000 g
Neck Load 24.3 lbs.
Neck Lift 28.9 lbs.
Ascent Rate 1329 fpm estimated
Descent Rate 950 fpm estimated
Parachute 10 ft.
Peak Altitude 95,000 ft. ASL estimated
Launch Conditions determined at launch

note: If we switch the balloon size, the burst will come down to 83,000 ft. ASL


Balloon Manufacturer Totex
Balloon Type latex
Balloon Size 2000 g
Neck Load 23.7 lbs.
Neck Lift 29.3 lbs.
Ascent Rate 1329 fpm estimated
Descent Rate 950 fpm estimated
Parachute 10 ft.
Peak Altitude 83,000 ft. ASL estimated
Launch Conditions determined at launch


Payload Configuration: 

Payload Experiment Designer

CU SGC, SHOT Workshop

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 (Google Map)
    • 2842 SE Frontage Road, Johnstown, CO  80534
    • Meet at 05:00
    • Head into the field at 06:00




Grid X

Grid Y

Hwy 14 & 71 West 50 15
Test Coordinates 40� 45'  -103� 15' 72.3 24.6



Tactical Call Signs

Tactical Callsign Name Notes
Alpha KC0UUO, N0IX Rob and Doug Tracking and Recovery Coordinator
Bravo KB0UBZ Ben Tracker
Charlie KC0RPS, W0NFW Jim and George Trackers
Delta K0SCC, WB0DKT Steve, Glenn and Parker Tracker
Echo W9CN, KD0JIT Mike, Miles Trackers, Comm Coordinator
Foxtrot WA9WWS, KD0MSP Don, Anthony Trackers
Golf N0NDM, W0CBH Larry, Benjie Launch Coordinator, Tracker
Hotel KB0LP Dave Tracker
India KC0ZIE, KG6HXM Darren, Sam Trackers

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