Flight Announcement for EOSS-190

Flight Coordinator: Rob Wright (kc0uuo@eoss.org

LAUNCH DATE: August 3rd, 2013 (wx delay +1 day)
LAUNCH TIME 7:10 am MDT (13:10 UTC)
LAUNCH SITE: Deer Trail, CO (driving directions to Deer Trail Launch Site)  

EOSS Flight Day Frequencies:

Tracking and Recovery Frequencies

Preflight Net:

  • 147.225 MHz (107.2 HZ Tone) CRA Repeater, 8 pm MDT preceding night 
  • 146.940 MHz (103.5 HZ Tone) RMRL Repeater if the CRA machine is down
  • 146.640 MHz will serve as a backup frequency

Tracking and Recovery Operations  

  • Front Range and out east 
    • 449.450 MHz RMRL (103.5 Hz Tone) 
  • 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.

Ground Stations Frequencies

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


EOSS-190 Balloon Payload Frequencies

  • Beacons
    • 147.420 MHz
      • CW ID: K0SCC
  • APRS
    • 144.340 MHz
      • ID: KC0UUO-11
      • DIGI: EOSS
      • APRS Time Slotted Every 30 seconds at 0:00 and 0:30
    • 147.420 MHz  
      • ID K0SCC-11
      • Slotted at 15 and 45 after the minute

Flight Systems: 


Balloon Manufacturer Totex
Balloon Type latex
Balloon Size 3000 g
Neck Load 21.3  Lbs.
Neck Lift 25.6 Lbs.
Ascent Rate 1329 fpm estimated
Estimated Burst Alt 100,000 ft. ASL
Descent Rate 950 fpm estimated
Parachute 8.5 ft.


Payload Configuration: 

Payload Experiment Designer

SGC Demosats

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 Operations   


For breakfast, we can convene at/on the bagels in Deer Trail.  Post-flight we can head to Applebee�s north of I-70 and Airport road on East 40th Avenue.  We are seeking Parker�s (Food and Beverage Coordinator) approval.

16485 E 40th Circle, Aurora CO 80011
United States
(303) 371-4114


Tracking and Recovery Grid

TrackPoint Grid Reference Location

Grid X

Grid Y

Last Chance



Grid Test   N 39.450, W103.500



Tactical Call Signs



Call sign





Marty, Mark

Tracking and Recovery Coordinators



Larry, Benjie

Tracking, Recovery



Mike, John, Miles

Tracking, Recovery



Stephen, Whitney, Parker

Tracking, Recovery




Tracking, Recovery



Rob, Doug

Flight Coordinator, Tracking, Recovery



John, Eileen

Tracking, Recovery


KB0YRZ Chris Tracking, Recovery




Colorado Space Grant



Chris Koehler

Colorado Space Grant