Announcement of EOSS-146

Special DF Flight Information

Flight Coordinator: Larry Cerney, 

LAUNCH DATE: September 26th, 2009 (wx delay +7)
LAUNCH TIME: 07:10 MDT (13:10 UTC) 
LAUNCH SITE: Deer Trail, Colorado (directions)

Payload Experiment Designer

  • EOSS - This is a DF training and fun flight

Experimenters are welcome to submit websites for linking or overviews which I will post on a page on the EOSS website.

EOSS Flight Day Frequencies:

Tracking and Recovery Frequencies

  • Preflight Net:
    • 147.225 MHz 8 pm local time the evening preceding the flight
      • 145.160 MHz simulcast in the Springs
    • 146.640 MHz will serve as a backup frequency
  • Tracking and Recovery Operations
    • 448.450 MHz PPFMA (100 Hz Tone) (southerly tracking flights)
    • 146.550 MHz simplex (same simplex for field and launch ops)
    • 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.
    • 7.228 MHz HF


EOSS-146 Balloon Payload Frequencies

DF Beacons

  • Beacons
    • 145.600 MHz
      • CW ID: AE0SS
    • 445.975 MHz
      • CW ID: W5VSI

Flight Systems:


Balloon Manufacturer Kaysam
Balloon Type latex
Balloon Size 1200 gram
Neck Load 7.8 lbs.
Neck Lift 10.4 lbs
Ascent Rate 1324 fpm estimated
Descent Rate 1000 fpm estimated
Parachute 5 ft.
Peak Altitude determined after flight
Launch Conditions determined at launch


Payload Configuration:

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


  • not set


DF Buddy

The DF Buddy is a "virtual" station that will give cross bearings to the balloon during the flight thus enabling individuals to DF the payload ALONE using triangulation with the DF buddy vector information. Below are three locations where these reports may be generated from.

Location Name and Description Latitude Longitude
Kiowa, Colorado - Intersection of SR 86 & CR 45 in downtown Kiowa  39.34657 N  104.46346 W
Calhan, Colorado - Intersection of US 24 & Yoder Rd in downtown Calhan. Yoder Rd. turns into Calhan Highway further out of town  39.03605 N  104.29358 W
Rush, Colorado - Intersection of Rush Rd and  SR 94  38.84013 N  104.09213 W




Grid X

Grid Y

Punkin Center (Intersection of SR 94 and SR 71)



Test Plot (  )    


Tactical Call Signs. 







Marty, Mark

Tracking and Recovery Coordinator



Jim and George




Mike & Miles

Contestant ?




Contestant ?

Echo N0NDM Larry Contentant ?




Cooperative Observer from Glenwood Springs

Golf KD0IRS, KD0IRR Dave, Kathy Cooperative Observer
Papa K0SCC, N0LP Steve, Nick and Daryl Team Peregrine
DF Buddy Intersection of SR-86 and CR-45 in downtown Kiowa   Set at Kiowa, grid 8.91, 69.14