EOSS Upcoming Flights
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06/20/2026 - 00:00 to 23:45
-
07/11/2026 - 00:00 to 23:45
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07/25/2026 - 00:00 to 23:45
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08/15/2026 - 00:00 to 23:45
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10/17/2026 - 00:00 to 23:45
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10/31/2026 - 00:00 to 23:45
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11/14/2026 - 00:00 to 23:45
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04/17/2027 - 00:00 to 23:45
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04/24/2027 - 00:00 to 23:45
EOSS-401/402 Denver Schools of Science and Technology (DSST) and Wheat Ridge HS CubeSat - Recap
EOSS members submit mileage for reimbursement here.
Recap Gallery:
Original Announcement:
On Saturday, May 9, 2026, we will launch two 3000g balloons carrying student experiments from classes at Denver School for Science and Technology (DSST) and Wheat Ridge High School. The first launch is scheduled for 7:00 a.m. at Deer Trail High School in Deer Trail, CO. The flight prediction can be found at https://www.eoss.org/predict/EOSS Members: Please indicate your intention to participate here.
- Payload Plan Rev C published May 8
- Payload Plan Rev D published May 8
Event Date:
Saturday, May 9, 2026 - 00:00 to 23:45
Flight Coordinator:
NØMM
Launch Site:
Flights:
EOSS-401
Balloon Type:
KKS 3000g Latex
Parachute:
12 ft Rocketman
Beacons:
| Frequency | Callsign | Type | Notes |
|---|---|---|---|
| 145.645 MHz | KC0D-2 | Remote Release/DF | |
| 144.340 MHz | KØSCC-13 | APRS/Digi | EOSSG Time slots: 0:00 and 0:30 |
Payload Plan:
EOSS-402
Balloon Type:
KKS 3000g Latex
Parachute:
12-ft Rocketman
Beacons:
| Frequency | Callsign | Type | Notes |
|---|---|---|---|
| 144.905 MHz | KCØD-3 | Remote Release/ DF | |
| 144.340 MHz | AE0SS-3 | APRS/ Digi | AEOSS. Time Slots: 0:20 and 0:50 |
Payload Plan:
EOSS-401 Lite
Balloon Type:
3000g KKS latex
Parachute:
12 ft Rocketman
Beacons:
| Frequency | Callsign | Type | Notes |
|---|---|---|---|
| 145.645 MHz | KCØD-2 | Remote Release/ DF | |
| 144.340 | KØSCC-13 | APRS/Digi | EOSSG TS: 0:00/0:30 |
Payload Plan:
EOSS-402 Lite
Balloon Type:
3000g KKS latex
Parachute:
12 ft Rocketman
Beacons:
| Frequency | Callsign | Type | Notes |
|---|---|---|---|
| 144.905 MHz | KCØD-3 | Remote Release/ DF | |
| 144.340 MHz | AEØSS-3 | APRS/Digi | AEØSS. TS: 0:20/:50 |
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, N0JD | Mike Pappas, Jeff Deaton | T/R |
| Bravo | KB0YRZ | Chris Krengel | T/R |
| Charlie | KC0RPS | Jim Langsted | Flight String Prep & Launch; T/R |
| Delta | K0SCC, N0JPS | Stephen Meer, John Spainhower | Flight String Prep & Launch; T/R |
| Echo | N0MM | Doug Leber | Flight Coordinator; Student Escort |
| Foxtrot | K0NKK | Nancy Koos | Flight String Prep & Launch; T/R |
| Golf | KE0UWC, KF0MBI | Glenn Reker, John Diubaldo | Balloon Fill; T/R |
| Kilo | WB4ZCP | Stephen Williams, Michele Williams | Ground Station; Balloon Fill; T/R |
| Yankee | KE0YAL | Brad Mears | T/R |
TR Breakfast:
Flight Trackers will meet at the Limon IHOP at 6:00 a.m.