Flight Announcement for EOSS-184

Recap Maps | Frequencies | Flight Systems | Payload Config | I-Gates | T & R | Text Recaps | Photos | Audio | Video | Data | Charts


Flight Coordinator: Chris Krengel  with help from Jim Langsted
LAUNCH DATE: March 16th, 2013 (wx delay +1 day)
LAUNCH TIME: 10:00 am MDT (16:00 UTC)
LAUNCH SITE: Manzanola, CO (driving directions Manzanola Launch Site)

EOSS Flight Day Frequencies:

Tracking and Recovery Frequencies

Preflight Net:

Our next flight is in Manzanola and we will probably not conduct a full net prior to flight but simply make a few announcements. This is due to the fact that folks will be spread across the state

  • 147.225 MHz 8 pm MDT preceding night
  • 447.575 MHz 8 pm MT preceding night (backup)
  • 146.640 MHz will serve as a backup frequency

Tracking and Recovery Operations

Drive from Denver to Manzanola

During Recovery

  • Repeaters 
    • 449.650 MHz (100Hz tone) (input -5 MHz) La Junta
    • 449.500 MHz (123Hz tone) (input -5 MHz) Lamar
  • Field Simplex Frequencies  
    • 446.100 MHz simplex for field recovery operations for EOSS-184
    • 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.
    • 146.550 MHz Backup field simplex
  • 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.

Ground Stations Frequencies

  • Launch Site Simplex
    • 146.550 MHz
  • HF - Possible ops
    • 7.235 LSB


EOSS-184 Balloon Payload Frequencies  

  • Beacons
    • 147.555 MHz
      • CW ID: AE0SS
    • 147.420 MHz
      • ID: K0SCC-11
  • 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
  • 147.420 MHz
  • ID: K0SCC-11
  • slotted 15 and 45 after the minute
  • 445.975 MHz
  • ID: KC0UUO-11

Flight Systems: 


Balloon Manufacturer Totex
Balloon Type latex
Balloon Size 1200 g
Neck Load 12.1  Lbs.
Neck Lift 15.7  Lbs.
Ascent Rate 1329 fpm estimated
Estimated Burst Alt 87,000 ft. ASL
Descent Rate 950 fpm estimated
Parachute 5.8 ft.


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.

Breakfast in Pueblo

Breakfast will be held at Doss Aviation.

Start time 7 AM MT

Cost $3.00 per person

Tracking and Recovery Grid    


Grid X

Grid Y

Punkin Center



Grid Test   38.50� N , 103.25� W




Tactical Call Signs


Call sign





Marty, Don

Tracking Coordinators



Rob, Doug

Tracking, Recovery


K0SCC ++

Steve, Parker ++

Tracking, Recovery, plus 2



Jim and Harlan

Co-FC, Tracking, Recovery



 Chris and Aubrey

Co-FC, Tracking, Recovery

Foxtrot KB0LP Dave

Tracking, Recovery



Glenn, Edna

Tracking, Recovery, BWB



Mike, Dave

Tracking, Recovery

India KE7KCK Tom

Tracking, Recovery (New Call)