EOSS-344 Ball Aerospace BIRST Flight - Recap

A slngle 3000g balloon was launched at 0700 on July 22, 2023 from Genoa, CO carrying two payloads developed by the Ball Aerospace BIRST program. The balloon reached an altitude of 103,247 feet and was released at that point to minimize post-burst chaos. The balloon landed approximatly 30 miles to the south near Aroyo, Colorado.

Link for member mileage reimbursement

Original Announcement: 
  • 07-10-2023Payload Plans Rev B posted
  • 07-12-2023Payload Plans Rev C posted
  • 07-19-2023Payload Plans Rev D posted
  • 07-20-2023TOP beacon corrected in Beacon Table below
  • 07-21-2023We are GO for launch at 0700 on Saturday from Genoa, CO

One 3000g balloon carrying payloads developed by the Ball Aeorspace intern program.

The launch is planned from Genoa, CO. This link shows maps to the launch site. The launch site is subject to the predicted path of the ballon and may have to change. Please watch this website for any necessary changes. 

The precicted flight path is shown here (scan for the flight date of 7-22-2023 and select the GIF (or other files) for the anticipated launch site). The slightly different flight path predictions for lite balloons (see below) are shown as EOSS-744 and EOSS-745. Use the links in the upper right corner of the prediction page to find these predictions.

If the cloud cover (greater than 5/10ths) prevents flying a non-exempt balloon, two 1500g balloons will be flown, configured as follows:

Event Date: 
Saturday, July 22, 2023 - 00:00 to 23:45
Flight Coordinator: 
Launch Site: 


One 3000g balloon

Balloon Type: 
Totex 3000g Latex
12 ft Rocketman with Remote Release Adam
144.905 MHzKC0D-2Remote Release / DFSecondary Beacon
144.340 MHzAE0SS-13APRS/Digi EOSSXPrimary Beacon Timeslotted 0:07 & 0:37
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

Skyhub Link Repeaters:

  • Limon (Cedar Point) - 447.650(-) MHz, 103.5 Hz
  • Hugo - 447.150(-) MHz, 103.5 Hz
  • Firstview - 447.600(-) MHz, 103.5 Hz
  • Akron - 447.425(-) MHz, 103.5 Hz
  • Stratton - 146.895(-) MHz, 103.5 Hz

        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
AlphaWAØGEH, KCØDMarty, Mark
CharlieKCØRPS, WØNFWJim, George
TR Breakfast: 
I Hop in Limon, 6:45