EOSS Upcoming Flights
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04/04/2026 - 00:00 to 23:45
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04/11/2026 - 00:00 to 23:45
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04/18/2026 - 00:00 to 23:45
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05/02/2026 - 00:00 to 23:45
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05/09/2026 - 00:00 to 23:45
EOSS-386/387 COSGC Fall Flight - Recap
Two 3,000g balloons were successfully launched on November 8, 2025, a breezy Saturday morning from Wiggins High School. The first balloon 386 launched at 6:47am reaching an altitude of over 100,000ft. The second balloon burst upon filling, and a backup balloon was successfully filled with 387 being launched after 7 am reaching an altitude of over 80,000'.
The winds sent the two balloons down range to Burlington, CO. 386 landed north east of Burlington, CO and 387 north east of Bethune CO. The tracking team was successfull in aquiring land owner permission and the students from 386 were able to retrive their payloads. The students from 387 did not retrieve their payloads, but our trackers brought them to the students at the feedlot on county road CC and county road 37.
EOSS member mileage reimbursement submission here
Recap Gallery:
Original Announcement:
Colorado Space Grant Consortium fall flight, estimating two 3,000g or three 1500g balloons depending on weather.
Launch site has been moved to Wiggins High School (directions here) for a Saturday morning launch.
- 11-06-2025Payload Plans Rev B posted
Event Date:
Saturday, November 8, 2025 - 00:00 to 23:45
Flight Coordinator:
KØNKK Nancy Koos
Launch Site:
Flights:
EOSS 386 HEAVY
Balloon Type:
3000g
Parachute:
12 ft Rocketman
Beacons:
| Frequency | Callsign | Type | Notes |
|---|---|---|---|
| 144.905 MHz | KC0D-1 | Remote Release/DF | TOP Secondary Beacon |
| 145.535 MHz | AE0SS-1 | Remote Release/DF | Flight Qualification with cutdown David |
| 144.340 MHz | AE0SS-3 | APRS/Digi DISC | BOTTOM Primary Beacon |
Payload Plan:
EOSS 387 HEAVY
Balloon Type:
3000g
Parachute:
12 ft Rocketman
Beacons:
| Frequency | Callsign | Type | Notes |
|---|---|---|---|
| 145.645 MHz | KC0D-2 | Remote Release/DF | TOP Secondary Beacon |
| 144.340 MHz | AE0SS-2 | ARPS/Digi DISC | Bottom Primary Beacon |
Payload Plan:
EOSS 386 Lite
Balloon Type:
1500G
Parachute:
12 ft Rocketman
Beacons:
| Frequency | Callsign | Type | Notes |
|---|---|---|---|
Payload Plan:
EOSS 387 Lite
Balloon Type:
1500G
Parachute:
12 ft Rocketman
Beacons:
| Frequency | Callsign | Type | Notes |
|---|---|---|---|
Payload Plan:
EOSS 388 Lite
Balloon Type:
1500G
Parachute:
12 ft Rocketman
Beacons:
| Frequency | Callsign | Type | Notes |
|---|---|---|---|
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
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:
| Tactical | Call Sign | Name | Notes |
|---|---|---|---|
| Alpha | W9CN | Mike Pappas | |
| Bravo | KB0YRZ | Chris Krengel | |
| Charlie | KCØRPS | Jim Langsted | |
| Delta | K0SCC, N0JPS | Stephen Meer, John Spainhower | |
| Echo | KE0UWC, KF0NLQ | Glenn Reker, Anne Herrington | |
| Foxtrot | K0NKK | Nancy, FC | |
| Golf | N0MM | Doug Leber | |
| Yankee | KE0YAL | Brad |
TR Breakfast:
5:15 am at IHOP, Flying-J in Limon
Lunch at "The Dish Room" in Burlington