EOSS-354 NDIA Flight

One 1500g balloon (EXEMPT) carrying student payloads sponsored by the Rocky Mountain Chapter of the National Defense Industrial Association - Planned launch time 0800 MDT.  The payloads will consist of 250 student experiments inside 3 Payload boxes.  These experiments are from schools in Colorado, Wyoming, Texas Louisiana, Virginia and Mississippi. 

Flight Coordinator: 
John Dinneen KCØL & Jim Langstead KCØRPS
Event Date: 
Saturday, March 16, 2024 - 08:00 to 23:45
Alt Launch Date: 
Sunday, March 17, 2024
Launch Site: 


Balloon Type: 
Kaymont 1500 gram Latex
12 foot Rocketman with Remote Release Charlie
144.340AEØSS-12APRS/Digi EOSSATime Slotted @ 0:27 & 0:57
144.905KCØD-3Remote release/DF

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


TR Breakfast: 
Tactical Calls: 
TacticalCall SignNameNotes
Live Flight Tracking: 

To view live flight tracking, navigate to https://track.eoss.org