Announcement of EOSS-154

Trip to GPSL

Nick Hanks GPSL2010 Information book

Several different stations will be using HF during this trip. Monitor 7.234 MHz LSB

During the drive out, during the recovery and during the drive back we will be attempting to get our convoy's APRS IDs into the internet. Here are a few callsigns to watch for. Click on them to go to APRS.FI and see their latest positions for the past 12 hours:

The balloon will be AE0SS-11

Nick will be using Twitter to keep folks up to date on our activities. Follow

Flight Coordinator: Nick Hanks, (

LAUNCH DATE:July 24th, 2010
LAUNCH TIME: 7 to 8 am
LAUNCH SITE: Hutchinson Municipal Airport

EOSS Flight Day Frequencies:

EOSS-153 Balloon Payload Frequencies

  • Beacons
    • 147.555 MHz
      • CW ID: AE0SS
  • 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

Flight Systems:


Balloon Manufacturer Totex
Balloon Type latex
Balloon Size 1200 g
Neck Load 3177 g
Neck Lift 4271 g
Ascent Rate 1320 fpm estimated
Descent Rate 1000 fpm estimated
Parachute 5 ft.
Peak Altitude determined after flight
Launch Conditions determined at launch


Payload Configuration:

Payload Experiment Designer

EOSS GPSL flight

We're off to Kansas to meet and greet with other ARHAB folks at this year's:

Great Plains Super Launch

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

Internet Gateway Stations:

The gateways will be provided in KS, but for future flights we are always looking for iGate folks.

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 

Marty Griffin will be Alpha and will make assignments in person Friday prior to the flight at our digs in Hutchinson