EOSS-342 Denver Area High Schools - Recap

  • One 1500g balloon [EOSS-342] was launched from Wiggins High School at 06:56 am MDT on Saturday June 3, 2023.
  • The balloon carried 2 DSST HS payloads, 1 Wheat Ridge HS payload and the EOSS GoPro Max Camera.
  • EOSS-342 rose to an altitude of 101,427 feet where the balloon burst. 
  • The payload string then landed about 2.5 miles northof Eaton, CO in Ault, CO at 0842 MDT at Latitude 40.5657, Longitude -104.7224, Altitude 4,902 ft [300 yards north of  CR-80 just east of US-85].
  • Mileage link for club members  https://forms.gle/qJjy47iTHF5ywDPJ6
Original Announcement: 

This flight is for Students of the Denver Public School's Denver School of Science & Technology, Northfield High School, and Jeffco Public School's Wheat Ridge High School.

The flight is sponsored by the American Institute of Aeronautics and Astronautics - Rocky Mountain Section (AAIA-RMS). 

MIleage link for club members is here.


Event Date: 
Saturday, June 3, 2023 - 00:00 to 23:45
Flight Coordinator: 
John Dinneen KCØL
Launch Site: 
Windsor X 30: Y 60 Grid Test: N 40.000 • W 104.000: X 80.8 Y 27.8

EOSS-342 Denver Area High Schools

The payloads will be 5 CubeSats and a GoPro Max Camera.Flight predictions link here ............Landing prediction is 6 mi E of Nunn(NS CR-100 & EW CR-41)  (X 45.6 Y 76.4) 

Balloon Type: 
Kaymont 1500g
Rocketman 10 ft.
144.340AE0SS-12APRS/Digi EOSSATimeslot at 0.27 & 0.57
144.905KC0D-14DF, Remote Release Adam
Payload Plan: 

EOSS Preflight Net @ 7 PM Mountain Time the preceding night:

The preflight net is hosted on the Fun Machine linked system https://www.we0fun.com/  

EchoLink *CANONCTY* conference and on the TGIF DMR Network Node: 1997 Talkgroup 815

Denver area Frequencies: 

    • 449.225 MHz (-5 MHz Offset, 141.3 Hz CTCSS) Mt Thorodin
    • 448.150 MHz (-5 MHz Offset, 141.3 Hz CTCSS) DIA
    • 449.975 Mhz (-5 MHz Offset, 100 Hz CTCSS) Westcreek
    • 447.525 MHz (-5 MHz Offset, 146.2 Hz CTCSS) Devils Head   

Back up Pre Flight Net Frequincies

        • 146.940 MHz (-600 KHz Offset, 103.5 Hz CTCSS) Rocky Mountain Radio League (RMRL) Repeater if the RMHAM machine is down
        • 146.640 MHz (-600 KHz Offset, 100.0 Hz CTCSS) Denver Radio League (DRL) Repeater will serve as a backup to the backup repeater 

Flight Day:
Launch Site:
        • 446.050 MHz Simplex  
        (Note that some radios assume these are repeater frequencies and attempt to put a 5 MHz offset in the transmit frequency automatically)

Track & Recovery Operations:
        • 449.450 MHz (-5 MHz Offset, 103.5 Hz Tone) RMRL repeater

        Simplex Frequencies:
        • 446.100 MHz Balloon #1 Field Simplex 
        • 446.150 MHz Balloon #2 Field Simplex
        • 446.200 MHz Balloon #3 Field Simplex
        • 446.275 MHz Car to Car drive out Simplex
        (Note that some radios assume these are repeater frequencies and attempt to put a 5 MHz offset in the transmit frequency automatically)

Digital Mobile Radio (DMR):

The decision as to which talkgroup use will be made by the EOSS RF Coordinator on a per flight basis.

  • Rocky Mountain Wide Network – Talk Group 700 - Rocky Mountain Ham Radio has approval to the use "Wide" for flight operations.
  • Central Colorado Regional Network – Talk Group 720 - On occasion, EOSS may use the Central Colorado Regional Network (Talk Group 720).

        Legacy 2M Simplex Frequency (not generally used due to desense/interference issues with the 2M APRS packets)
        • 146.550 MHz Simplex

2M Direction Finding Frequencies:

  • 144.340
  • 144.360
  • 144.905
  • 145.535
  • 145.645
  • 145.710
  • 145.765


Tactical Calls: 
TacticalCall SignNameNotes
AlphaW9CNMikeSaturday only
BravoWAØGEH, KCØLMarty, John (Flight Coordinator)
ClarlieNØRPF, KØBRARob, Doug
EchoKCØRPSJimSunday only
FoxtrotWBØDKT, KB6OKAGlen, Edna
Ground StationN2XGL, K5JK, NoCallJeff, Tom, Randy