Next Flight

STEM School and Academy Spartan ARC Flight EOSS-202


This flight is sponsored and coordinated by the Douglas County STEM high school.

The plan is for seven payloads:

  • Three payloads from the Douglas County STEM School and Academy
    • STEM 1 - STEM School and Academy has a Barometer and 4 or 5 different battery chemistries to test their discharge characteristics as a function of altitude.  It detects liftoff from altitude change and then starts logging the data. The purpose of the payload is to teach elementary and high school students at the STEM Academy the principals, of system engineering, including electronics, hardware and software.
    • STEM 2 - STEM School and Academy’s advanced team payload contains a sensor board designed to record acceleration, rotation, magnetic orientation, relative air pressure and GPS coordinates including altitude. The board writes all of the data to an on board Micro SD card. Along with the sensor board is a small "key chain" camera recording video at 1080p. All systems are powered with lithium polymer batteries which are capable of temperature ranges of 32 degrees Fahrenheit to 150 degrees Fahrenheit.
    • STEM 3 - Colorado Early College of Douglas County - Altitude-independent Responsive and Intelligent Static Environment (ARISE). ARISE will contain a small enclosure that will maintain a controlled, static environment throughout the flight. It will maintain certain environmental conditions without regard to the altitude, such as (but not necessarily constrained to) temperature, tilt, and pressure. Inside of the enclosure will be a small camera to observe the inside of the enclosure, and several physical systems to show the success or failure of the environmental control system, such as a thermometer, a small balloon, and a weighted spring. Pressure, temperature and tilt data would be logged alongside the video from the camera. The primary goal for ARISE is to stretch the limits of how lightweight such a system can get.
  • One from the Boulder Young Amateurs
    • The Boulder Amateur Radio Club Jr’s (BARC Jr’s #1) will be creating single sensor experiments catered to younger students involved with the flight. 
  • One from the Pueblo West Amateur Radio club
    •   "Is there sound in space?"  Altitude obviously affects sound propagation as the atmosphere depletes. SOUND PROPAGATION (At High Altitudes).  Record sound beeps at intervals as the balloon climbs.  The recorder enters the time digitally and the time and altitude are known by trackers.  A beep generator makes tones which do not change, and as the propagation gets poorer this is recorded.  Later we can put it on an oscilloscope to make measurements at each altitude.  SYSTEM SPECS:  1) ultralight weight components (maximum 300 gm)  2) self-powered payload 3) duration of function 90 minutes minimum, to get to full height;  would like to get recordings both rising and coming down 4) must be a pure sound so it can be analyzed for changes for altitude 5) need physical separation between beeper and recorder.
  • Two New Mexico STEM program
    • NM 1 - The payloads from Albuquerque Public School STEM students are involved with New Mexico Space Studies. This payload is a Cube-Sat. The flight computer system which records data and integrates all sensors and electronics including a radiological sensor, CO2 sensor, and Ozone sensor, which runs off of solar panels to a battery, using a Arduino board which times stamps input from sensors with location and time.
    • NM 2 - Delta Flight Frame. This payload includes a Go-Pro camera set up to record the entire mission.

Flight Prediction (click this link, then scroll down to EOSS 202)

Flight Coordinator: 
Jim Langsted KCØRPS
Event Date: 
Saturday, October 25, 2014 (All day)
Alt Launch Date: 
Sunday, October 26, 2014
Launch Site: 


Balloon Type: 
1600g Latex
8.5 ft with fast release
147.555 MHzAEØSSCW/cutdown beaconfor direction finding
147.420 MHzKCØUUO-11APRS beaconsecondary beacon
144.340 MHzAEØSS-11APRS beaconprimary beacon and digipeater

Preflight Net:

  • 147.225 MHz CRA Repeater (107.2 Hz Tone) 8 pm MDT preceding night
  • 146.940 MHz (103.5 HZ Tone) RMRL Repeater if the CRA machine is down
  • 146.640 MHz (100 Hz Tone) DRL will serve as a backup frequency

Recovery Operations:

  • 449.450 MHz RMRL (103.5 Hz Tone)
  • 448.225 MHz (141.3 Hz Tone) Testing… PL verified 7/2/14
  • 446.100 MHz Field Simplex
  • 146.550 MHz Backup field simplex

Launch Site Simplex: 146.550 MHz

HF - Possible ops: 7.235 LSB

Tactical Calls: 
TacticalCall SignNameNotes