EOSS-374 Gateway to Space

KCØRPS's picture
Submitted by KCØRPS on Sat, 04/12/2025 - 16:56

The flight is postponed until Saturday April 26, 2025.

Updated EOSS participation links, please rereginster if you can participate on April 26th.  Register here to indicate your participation: https://forms.office.com/r/7A4Q0mvp6v . The summary spreadsheet is shown here: EOSS Flight Day  _April 26th, 2025.xlsx . If you are signed in to your EOSS Teams account (xxx@eoss.org) then you should see the spreadsheet sync with the submitted forms. If not you will have to wait until someone else sync's it, then your entry should show.

  • 04-15-2025 Updated EOSS participation links posted
  • 04-15-2025 Payload Plans Rev C posted
  • 04-12-2025 Payload Plans Rev B posted
  • 04-10-2025 Payload Plans Rev A posted

This is one 3000g balloon, or two 1500g balloons carrying student-built payloads for CU Boulder's Gateway to Space program. Launch time will be 6:45am MDT from Deer Trail Colorado. Directions to the Deer Trail Launch site are shown here.

Predictions are shown at www.eoss.org/predict. Scroll to the correct date and launch site.

If the cloud cover exceeds 5/10ths, the Heavy balloon will be split into two Lite balloons as follows:

Flight Coordinator: 
KC0RPS
Event Date: 
Saturday, April 19, 2025 - 00:00 to 23:45
Alt Launch Date: 
Saturday, April 26, 2025
Launch Site: 
Deer Trail
Flights: 

EOSS-374 Heavy

Balloon Type: 
Totex 3000g Latex
Parachute: 
12 ft Rocketman with Remote Release Baker
Beacons: 
Beacons
FrequencyCallsignTypeNotes
144.905 MHzKCØD-1Remote Release/DFTOP, Secondary Beacon
145.535 MHzAE0SS-4Voyager, APRS/DFFlight Qualification
145.645 MHzAEØSS-1Atlantis, APRS/DFFlight Qualification
144.340 MHzAEØSS-3Enterprise, APRS/Digi "AEØSS"BOTTOM beacon, timeslotted :20 & :50
Payload Plan: 
PDF icon EOSS-374 Heavy Rev C.pdf
FrequencyList: 

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:
        Repeaters:
        • 449.450 MHz (-5 MHz Offset, 103.5 Hz Tone) RMRL repeater

Skyhub repeaters linked to the primary FM repeater (449.450 MHz):

    • Limon (Cedar Point) - 447.650(-) MHz, 103.5 Hz
    • Hugo - 447.150(-) MHz, 103.5 Hz
    • Firstview - 447.600(-) 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
Live Flight Tracking: 

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