EOSS-392/393 COSGC Spring Flight - Recap

KCØRPS's picture
Submitted by KCØRPS on Sun, 03/22/2026 - 14:31

EOSS 392, 393 Heavies Rev B has new tops and bottoms. EOSS 392. 392, 394 Lites Rev A overweight waiting for final weights on April  1. We may have to drop some payloads.  This will be two 3000g balloons or three 1500g balloons carrying student payloads for the Colorado Space Grant Consortium program.   If clouds prevent the launch of 3000g balloons, the payloads will be separated and launched as 3, 1500g payloads.

Flight prediction: https://eoss.org/predict.

Mileage link: https ://forms.microsoft.com/r/wKHQHifSjL?origin=lprLink

EOSS 392 and EOSS 393 were launched from Deer Trail School Saturday April 4. There were 31 payloads from Colorado Home School, High School, College, and University students.  

EOSS 392 was launched at 7:00 burst at 7:55 at an altitude of 84,489ft. Flight time was 1 hr and 38 minutes, traveled 51.96miles landing S/E of Arriba CO, south of I70 Frontage road between N/S CR O and N/S CR 47.

EOSS 393 was launched at 7:22 burst at 8:39 at an altitude of 97,827ft. Flight time was 2 hr 30seconds, traveled 59.97 miles landing S/E of Flagler CO, between CR 8 and CR R.

Both landings were in high ground winds with barb wire fencing catching the parachutes and payloads.

 Pay load plans Rev D, show total student weights as flown,

 

 

Recap Gallery: 
Original Announcement: 

EOSS 392, 393 Heavies Rev B has new tops and bottoms

EOSS 392. 392, 394 Lites Rev A overweight waiting for final weights on April  1. We may have to drop some payloads.

This will be two 3000g balloons or three 1500g balloons carrying student payloads for the Colorado Space Grant Consortium program. 

If clouds prevent the launch of 3000g balloons, the payloads will be separated and launched as follows

Flight prediction: https://eoss.org/predict

Event Date: 
Saturday, April 4, 2026 - 00:00 to 23:45
Flight Coordinator: 
KØNKK- Nancy Koos
Launch Site: 
Deer Trail
Flights: 

EOSS 392 HEAVY

Balloon Type: 
3000G
Parachute: 
12FT ROCKEMAN
Beacons: 
FrequencyCallsignTypeNotes
145.645KC0D-2Remote Release/DFPaired with Release Baker
144.340AE0SS-4APRS/DigiTime Slot 13 & 43
Payload Plan: 
PDF icon EOSS-392 Heavy Rev D (2).pdf

EOSS 393 HEAVY

Balloon Type: 
3000G
Parachute: 
12FT ROCKEMAN
Beacons: 
FrequencyCallsignTypeNotes
144.905AE0SS-1Top/Cutdown Paired with Release David
144.340AE0SS-3APRS/DigiTime Slot 20 & 50
Payload Plan: 
PDF icon EOSS-393 Heavy Rev D.pdf

EOSS 392 LITE

Balloon Type: 
1500G
Parachute: 
12FT ROCKEMAN
Beacons: 
FrequencyCallsignTypeNotes
145.645KC0D-2Top/Cutdown Paired with Release Baker
144.340AE0SS-4APRS/DigiTime Slot 13 & 43
Payload Plan: 
PDF icon EOSS-392 LITE Rev C.pdf

EOSS 393 LITE

Balloon Type: 
1500G
Parachute: 
12FT ROCKEMAN
Beacons: 
FrequencyCallsignTypeNotes
144.905AE0SS-1Top/Cutdown Paired with Release David
144.340AE0SS-3APRS/DigiTime Slot 20 & 50
Payload Plan: 
PDF icon EOSS-393 LITE Rev C.pdf

EOSS 394 LITE

Balloon Type: 
1500G
Parachute: 
12FT ROCKEMAN
Beacons: 
FrequencyCallsignTypeNotes
145.535KC0D-14Top/Cutdown Paired with Release Adam
144.340K0SCC-14APRS/DigiSlot 15 & 45
Payload Plan: 
PDF icon EOSS-394 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

 

Tactical Calls: 
TacticalCall SignNameNotes
AlphaW9CN, N0JDMike PappasJeff Deaton
BravoKB0YRZKris KringelZack
CharlieKC0RPSJim Langsted
DeltaKC0SCCStephen Meer
EchoN0MMDoug Leber
FoxtrotK0NKKNancy Koos
GolfKE0UWC, KF0MBRGlenn RekerJohn
HotelKN0NLQAnne Herrington
ZuluN0NDMLarry NobelIf tracking
TR Breakfast: 
Tracker breakfast at Limon IHOP see you there at 6:00am, usually 1 hour before launch..