EOSS-367/368 Colorado Space Grant Consortium Fall Launch - Recap

Two 1500g exempt balloons were launched on Saturday February 1, 2025 from Deer Trail, Colorado. This flight was a twice-delayed (weather) launch of student-built payloads from Colordado Space Grant Consortium supported schools throughout Colorado. The balloons flew as follows (prelim data from KC0RPS' log):

  • EOSS-367 -- launched at 7:03am, rose to a maximum altitude of 89,245 feet MSL, landed at 9:03am at 39.383, -102.535, 6.3 mi NNE of Stratton CO, east of north-south CR 34, between CR D & CR BB.
  • EOSS-368 -- launched at 7:33am, rose to a maximum altitude of 91,281 feet MSL, landed at 9:41am at 39.355, -102.439, 9.6 mi NE of Stratton CO, south of east-west CR Z between CR 39 & CR 40.

 EOSS member mileage reimbursement submission here.

Original Announcement: 

The Rescheduled Flight is on for February 1, 2025

from Deer Trail Colorado.

  • 11-06-2024Payload Plans Rev B posted
  • 01-28-2025Renumbered Payload Plans Rev A posted
  • 01-29-2025Corrected Payload Plans Rev B posted
  • 01-31-2025Corrected Payload Plans Rev C posted

This is one 3000g balloon or two 1500g balloons carrying Colorado Space Grant Consortium school student payloads.

The balloons will be launched from the Deer Trail School located in Deer Trail Colorado (map). The school will be available for use of the restrooms only, Warm-up will be in your cars. Dress warm. 

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

 Click here to sign up to participate on the flight.  

 

Event Date: 
Saturday, February 1, 2025 - 00:00 to 23:45
Flight Coordinator: 
KC0RPS
Launch Site: 
Flights: 

EOSS-367 Heavy

3000g balloon for Colorado Space Grant Consortium

Balloon Type: 
Totex 3000g Latex
Parachute: 
12 ft Rocketman with Remote Release Charlie
Beacons: 
Beacons
FrequencyCallsignTypeNotes
145.710 MHzKC0L-11APRS/DFTOP, Secondary Beacon, to Honor KC0L(SK)
144.340 MHzAE0SS-4Voyager APRS/Digi VOYABOTTOM, Primary Beacon, TS 0:13 & 0:43
Payload Plan: 
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

Linked with SkyHub Link Repeaters:

  • Cedar Point CO, 447.650 Minus PL 103.5 
  • Hugo CO, 447.150 Minus PL 103.5
  • First View CO, 447.600 Minus PL 103.5


        Simplex Frequencies:
        • 446.100 MHz EOSS-367 Field Simplex 
        • 446.150 MHz EOSS-368 Field Simplex
        • 446.200 MHz Spare 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):

  • Rocky Mountain Wide Network – Talk Group 700 - Rocky Mountain Ham Radio has approval to the use "Wide" for flight operations.

2M Direction Finding Frequencies:

  • 144.340
  • 144.905
  • 145.710

 

Tactical Calls: 
TacticalCall SignNameNotes
AlphaW9CN, N0JPSMike, JohnFlt String Prep and Launch, Fill Team, Track and Recovery
BravoNØRPF, KØBRARob, Doug?Sat, Flt String Prep and Launch, Fill Team, Track and Recovery
DeltaKØSCCStephenFlt String Prep and Launch, Track and Recovery
EchoKCØRPS, WØNFWJim, George
Ground StationKEØUWC, N2XGLGlenn, Jeff
FoxtrotKBØYRZChrisLate Addition to List
HotelWAØGEH, KFØNLQMarty, AnneTracker Only
IndiaKEØUWCGlen RekerFill Team Only
XRAYKØNKK *Nancy* Scratch
JulietKF0RXHRuthCOSGC DemoSat Assistant
TR Breakfast: 
Tracker Breakfast at 6:00am at the IHOP at the Flying J truck stop in Limon, Colorado