AIAA-RMS sponsored launch for the Denver Schools of Science and Technology (DSST) and Wheat Ridge HS

Submitted by Doug NØMM on Sat, 05/03/2025 - 16:31

The Rocky Mountain Section of the American Institute of Aeronautics and Astronautics (AIAA-RMS) is sponsoring this launch day for the Denver Schools of Science and Technology (DSST) and Wheatridge High School, which will include two balloons: a 3000g latex balloon and a 1500g latex balloon. If weather conditions demand, we will launch three 1500 g latex balloons.

The balloons will carry CubeSats containing a variety of student experiments to altitudes approaching 100,000 feet. In addition to Wheatridge High School, three DSST high school campuses are represented in this launch: DSST Montview, DSST Cedar, and DSST Conservatory Green.  

 

Launch Time: First balloon: 06:45 MDT (12:45 UTC) Second: 7:05 a.m. MDT (13:05 UTC), and Third: 7:25 a.m. MDT (13:25 UDT)

Launch location: Limon Softball Fields, 50597 Colorado Highway 71 (about 3.5 miles south of Limon, CO) 

Flight Path Prediction: eoss.org/predict. Locate the flight number (e.g., EOSS-376) and scroll to the launch location (e.g., Limon). Choose 'GIF' for a map image of the predicted path.:

Live Tracking of Flight: track.eoss.org 

For EOSS Members

The EOSS participation form is available here: https://forms.office.com/r/dvFGCTnrXv. The summary spreadsheet is available here: EOSS Flight Day  May 10th, 2025.xlsx and will be available to you (sync'd to the submitted forms) if you are signed in to your EOSS Teams account.

Flight Coordinator: 
Doug Leber NØMM
Event Date: 
Saturday, May 10, 2025 - 00:00 to 23:45
Alt Launch Date: 
Sunday, May 11, 2025
Launch Site: 
Limon Softball Fields
Flights: 

EOSS-376 Lite

Balloon Type: 
Kaymont 1500g Latex
Parachute: 
12 Ft Rocketman. Release Baker
Beacons: 
FrequencyCallsignTypeNotes
145.535KC0D-1Remote Release/DFTOP
144.340AE0SS-3APRS/. DIGI LiteBOTTOM Alias "AEØSS" Time slot 0:20 and 0:50
Payload Plan: 
PDF icon EOSS-376 Lite Rev C.pdf

EOSS-377 Heavy

Balloon Type: 
Kaymont 3000g Latex
Parachute: 
12 ft Rocketman with release Baker
Beacons: 
FrequencyCallsignTypeNotes
144.905KC0D-2Remote Release/DFTOP
144.340AE0SS-2APRS/DIGIAlias "DISC" Time slots: 0:08 and 0:38
Payload Plan: 
File EOSS-377 Heavy Rev C.docx

EOSS-377 Lite

Alternate payload plan for 1500g balloon

Balloon Type: 
1500g Kaymont Latex
Parachute: 
12 ft Rocketman with Remote Release Adam
Beacons: 
FrequencyCallsignTypeNotes
145.905KCOD-2 APRS/DFTOP
144.340AEOSS-2APRS/DIGIBOTTOM time slots: 0:08 and 0:38 ALIAS: "DISC"
Payload Plan: 
PDF icon EOSS-377 Lite Rev C.pdf

EOSS-378 Lite

Alternate payload plan for 1/2 of the payload of EOSS-377 Heavy 

Balloon Type: 
1500g Kaymont Latex
Parachute: 
12 ft Rocketman with Remote Release Charlie
Beacons: 
FrequencyCallsignTypeNotes
144.710KC0D-3APRS/ DF/Remote ReleaseTOP
144.340AE0SS-4APRS/DigiBOTTOM Time slots: 0:13 and 0:43 Alias: "VOYA"
Payload Plan: 
PDF icon EOSS-378 Lite 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

        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: 
5:45am at IHOP in the Flying J, Limon
Tactical Calls: 
Trackers
TacticalCall SignNameNotes
AlphaW9CN, NØJDMike, JeffT&R Coordinator
BravoKBØYRZChrisT&R
CharlieKCØRPSJim, John LewisLaunch Site, T&R
DeltaKØSCC, NØJPSStephenFlight String Management, T&R
EchoNØMMDougFlight Coordinator, Student Escort
Ground StationN2XGL, KØNKKJeff, NancyGround Station
FoxtrotKEØUWC, KFØMBRGlenn, JohnT&R
GolfNØNDMLarryBalloonmeister
Live Flight Tracking: 

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