Flight Announcement for EOSS-164

Flight Coordinator: none announced

LAUNCH DATE: May 28th, 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 RMRL (103.5 Hz Tone) north track
    • 145.295 MHz (100 Hz Tone) Sterling
    • 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-164 Balloon Payload Frequencies


  • 147.555 MHz
    • CW ID: AE0SS


  • 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 18.1 lbs.
Neck Lift 21.8 lbs.
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


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

Alpha News

EOSS 164 be a heavy 3000 gm balloon.  This will be a long, flight so bring food and water as well as cash for gas!  The students will be on the run to catch up with this flight, so we will wait until they arrive.

This will be fun as Mike will be sending up the GoPro Hero to get some cool video.  Be sure to download the Payload Plan, thanks Mike Manes. 

Unless we decide to cut down early, we will head out I-76 to Exit 125 and go east on Highway 6 towards the prediction.  Stay tuned for any changes. 

We may migrate to the Sterling 145.295 � PL 100 repeater so I suggest you have it programmed into your radios.  Thanks Pappas for the research. 

Nice group for these flights!  Thanks for coming out on this holiday weekend.  I know Chris and Brian really appreciate this effort.



  • McDonalds in Ft. Morgan (Google Map)
    • Meet at 05:30
    • Head into the field at 06:00




Grid X

Grid Y

Hwy 14 & 71 West 10 30
Test Coordinates (41.25� N, 103.75� W) 6.2 73.9



Tactical Call Signs

Tactical Callsign Name Notes
Alpha WA0GEH, KC0D, KD0MSP Marty, Mark, Anthony Tracking and Recovery Coordinator
Charlie W9CN, KD0JIT Mike, Miles Trackers, Comm Coordinator
Echo KC0ZIE, KG6HXM Darren, Sam Trackers
Golf N0NDM, W0CBH Larry, Benjie Launch Coordinator, Tracker
India KB0UBZ Ben Tracker
Juliet KC0UUO, KB0YRZ, N0IX Rob, Chris, Doug Trackers and Executive Branch