EOSS Upcoming Flights
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05/10/2025 - 00:00 to 23:45
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05/24/2025 - 00:00 to 23:45
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06/14/2025 - 00:00 to 23:45
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06/17/2025 - 00:00 to 23:45
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08/02/2025 - 00:00 to 23:45
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10/23/2025 - 00:00 to 23:45
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11/01/2025 - 00:00 to 23:45
EOSS-372/373 Metro State University - Intro2Space & Littleton EPIC - Recap
A beautiful morning a few light clouds and a big moon.
We launched 2 balloons on April 12, 2025, 373H @ 6:45am with MSU payloads and 372L @ 7:08 am with Littleton EPIC Payloads. Both balloons headed towards Arriba/Flagler CO reaching over 90,000ft.
373 landed closer to Arriba W of hw 63 and S of 3Z. 372 landed north of Flagler at the corner of CR 6 and FF.
EOSS member mileage reimbursement submission here
Recap Gallery:
Original Announcement:
- 04-11-2025Payload Plans Rev B posted
- 04-10-2025Payload Plans Rev A posted
Launch time: 1st balloon 6:45am, 2nd balloon 7:05am.
This is one 3000g Heavy balloon and one 1500g Lite balloon carrying student-built payloads from Metro State University's Intro to Space program and Littleton EPIC Aerospace program. One CU-Boulder payload is included as well.
In addition to the first Lite payload string (EOSS_372 Lite), if cloud cover exceeds 5/10ths, the Heavy payload string will be split into two Lite strings as follows:
These payload plans include updated payload masses from both MSU and EPIC.
Event Date:
Saturday, April 12, 2025 - 00:00
Flight Coordinator:
KØNKK Nancy Koos
Launch Site:
Flights:
EOSS-373 Heavy
If cloud cover exceeds 5/10ths, this payload string will be separated into two Lite balloons. This balloon carries student-built payloads for the Metro State University Intro 2 Space program.
Balloon Type:
Totex 3000g Latex
Parachute:
12 ft Rocketman with Remote Release Baker
Beacons:
| Frequency | Callsign | Type | Notes |
|---|---|---|---|
| 144.905 MHz | KCØD-1 | Remote Release/DF | TOP, Secondary Beacon |
| 144.340 MHz | AEØSS-3 | Enterprise APRS/Digi AE0SS | BOTTOM, Primary Beacon, Timeslot 0:20 & 0:50 |
Payload Plan:
EOSS-372 Lite
This 1500g balloon will be launched regardless of the cloud cover. This balloon carries student-built payloads for the Littleton EPIC Aerospace program
Balloon Type:
Totex 1500g Latex
Parachute:
12 ft Rocketman with Remote Release Charlie
Beacons:
| Frequency | Callsign | Type | Notes |
|---|---|---|---|
| 145.710 MHz | KCØD-3 | Remote Release/DF | TOP, Secondary Beacon |
| 144.340 MHz | AEØSS-12 | APRS/Digi EOSSA | BOTTOM, Primary Beacon, Timeslot 0:27 & 0:57 |
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
Skyhub repeaters linked to the primary FM repeater (449.450 MHz):
- Limon (Cedar Point) - 447.650(-) MHz, 103.5 Hz
- Hugo - 447.150(-) MHz, 103.5 Hz
- Firstview - 447.600(-) MHz, 103.5 Hz
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 | |
| Papa | NØRPF | Rob | |
| Charlie | NØNKK | Nancy Koos | Flight Coordinator |
| Delta | KØSCC | Stephen Meer | |
| Echo | KCØRPS, KFØNLQ | Jim Langsted, Anne Herrington | |
| Foxtrot | KEØUWC, KFØMBR | Glenn Reker, John Diubaldo | |
| Golf | N3RJO | Randy Owen | Metro State University |
| Gound Station | N2XGL, KBØTVJ | Jeff Shykula, Russ (Remote), Randy | |
| Hotel | NØMM | Doug Leber | |
| India | KDØNKE | KatieRae Williamson | Littleton EPIC |
| Juliet | NØNDM | Larry Noble | |
| Kilo | |||
TR Breakfast:
Tracker Breakfast will be at 0545 in the I-HOP at the Flying-J truckstop in Limon, Colorado