Flight Announcement for EOSS-167

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

LAUNCH DATE: July 30th, 2011 (wx delay +1 day)
LAUNCH TIME: 08:10 am MDT (14:10 UTC)
LAUNCH SITE: State Wildlife Area, Ramah, CO (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
    • 448.450 MHz (100 Hz Tone) PPFMA Machine
    • Field Simplex Frequencies
      • 446.050 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-167 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 2000 g
Neck Load 13.2 lbs.
Neck Lift 16.7 lbs.
Ascent Rate 1329 fpm estimated
Descent Rate 950 fpm estimated
Parachute 5.8 ft.
Peak Altitude 93,000 ft. ASL estimated
Launch Conditions determined at launch


Payload Configuration:

Payload Experiment Designer


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  




Grid X

Grid Y

Punkin Center Rd (SR 94 and SR 71) 30 30
Test Coordinates    39.25� N  x   -103.75� 'W 27.4 57.3



Tactical Call Signs

Tactical Callsign Name Notes
Alpha WA0GEH, KC0D, N0WPR Marty, Mark, Paula and Sharon Tracking and Recovery Coordinator
Bravo N0MPM, KD4STH Mike and Paul Trackers, Comm Coordinator
Charlie N0NDM Larry Launch Coordinator Trackers
Delta KB0YRZ Chris Trackers
Echo W0CBH Benjie and Rosie Trackers
Foxtrot KC0UUO Rob and KJ Flight Coordinator and President
Golf KC0RPS Jim Trackers
Hotel N0IX Doug Trackers
India KB0DKT, KB0OKA Glenn and Edna Trackers
Juliet W9CN, KD4JIT Mike and Miles Trackers
Kilo K0SCC Steve Trackers