Flight Announcement for EOSS-177/178

 | Frequencies | Flight Systems | Payload Config | I-Gates | T & R |

Flight Coordinator: Larry Cerney, K0ANI

LAUNCH DATE: June 30th, 2012 (wx delay +1 day)

  • EOSS--177 - 06:50 am MDT (12:50 UTC)
  • EOSS--178 - 07:10 am MDT (13:10 UTC)

LAUNCH SITE: Deer Trail (driving directions)

EOSS Flight Day Frequencies:

NOTE: Fire Operations on all repeaters take precedence, defer to their activities

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

  • Repeaters 
    • 449.450 MHz (103.5 Hz Tone) RMRL
    • 147.060 (103.5 Hz Tone) Genoa Repeater (IRLP Node: 3794)
    • 447.875 (103.5 Hz Tone) Deer Trail repeater
  • Field Simplex Frequencies  
    • 446.100 MHz simplex for field recovery operations
      • 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.


  • Launch Site Simplex
    • 146.550 MHz


EOSS-177 Balloon Payload Frequencies

  • Beacons
    • 147.420 MHz
    • CW ID: K0SCC
  • 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

EOSS-178 Balloon Payload Frequencies

  • Beacons
  • 147.555 MHz
  • CW ID: W5VSI
  • APRS
  • 144.340 MHz
  • ID: KC0YA-11
  • Node: BALND2
  • APRS Time Slotted Every 30 seconds at 0:15 and 0:45
  • power up at 13 seconds past the GPS minute to properly slot telemetry
  • Backup
  • None

Flight Systems: 


Balloon Manufacturer Totex
Balloon Type latex
Balloon Size 3000 g
Neck Load 22.5 Lbs.
Neck Lift 26.9 Lbs.
Ascent Rate 1329 fpm estimated
Descent Rate 950 fpm estimated
Parachute 10 ft.



Balloon Manufacturer Totex
Balloon Type latex
Balloon Size 3000 g
Neck Load 21.7 Lbs.
Neck Lift 25.9 Lbs.
Ascent Rate 1329 fpm estimated
Descent Rate 950 fpm estimated
Parachute 8.5 ft.


Payload Configuration:

Payload Experiment Designer

Student Hands on Training (SHOT)

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  

This is a double flight on Behalf of the Space Grant SHOT II program.  Two 3000 gm balloons.

We have permission to use the 448.450 machine, however the current fire-effort takes priority.  Most of the other wide-area repeaters in Colorado Springs are being used by the incident commanders, including the Colorado Connection.  So, as an alternative, we are considering using the Deer Trail repeater on 447.875 pl 103.5 or the Genoa repeater on 147.60 + PL 103.5.  I have email messages pending to K0GS.

Breakfast for the trackers will be at the launch site at Deer Trail.

We will not allow auto travel in open fields due to possible fire issues, so bring your walking shoes.  Bring plenty of water and some extra in case we see some fires. 

Thank you all for your sacrifices this week and next.  Please advise if the following information needs to be adjusted



Location Grid X Grid Y
Last Chance 35 45
Grid Test     40.5� N x 103.5� W 39.9 97.1


Tactical Call Signs


Call sign



Alpha WA0GEH Marty Tracking and Recovery
Bravo KB0YRZ Chris Tracker
Charlie W9CN Mike and Miles Tracker
Delta KC0RPS,  N0NFW, N0SSW  Jim, George, Harlan Trackers
Echo KC0UUO, N0IX Rob, Doug President, Tracker
Foxtrot K0SCC, K0ETN Steve, Rick, Daryl  RIO, RIO,  Pilot
Golf WG0E Colin, Darryl Trackers
Hotel N0NDM Larry Launch and Grab