Flight Recap: EOSS-304/305 COSGC Demosats & BUFFS and CU-Boulder Space Minor BUFFS

EOSS-304 was launched at 0645 on 11/7/20 from Wiggins, CO with 21 Payloads from the CU Buffs Space minor.  All Payloads and beacons were recovered south of Peetz, CO at 41.01153, -103.06078.  Maximum altitude acheived was 89,650 ft.

EOSS-305 was launched at 0705 on 11/7/20 from Wiggins, CO with 8 Payloads from Colorado Space Grant Consortium colleges.   All payloads and beacons were recovered east of Sidney, Nebraska at 41.12667, -102.94258 Maximum altitude acheived was 90,480 ft..

Please see galleries below for Charts, Data and pictures.

Mileage reimbursement may be filed here: https://forms.gle/EviCcy6wcNHXhJkL8

Color Commentary from W9CN:

Just a  quick note of Thanks! to all of those folks who helped us track and recover EOSS 304 & 305.

Really appreciate the extra effort and all of the driving to outside of Peetz Colorado and Sidney Nebraska!  
It was a “Textbook" track, cutdown and recovery.
The EOSS 304 team collected it up in record time.. Jim KC0RPS got landowner permission in what seemed like seconds and Brad KE0YAL, Jeff N6BA & Danielle KD8YQL got the payloads out of a freshly planted field with minimum impact.  Nice Video N6BA
Really Great Work on this!
And the Dynamic Duo of Batman and Robin (AKA Rob N0RPS and Doug N0BRA) were right on top of EOSS 305.  Special Cameo Appearances by John K0JWB and Nancy K0NKK who along with 'RPF, 'BRA trekked out into Mike Weezers field to make it happen (along with Marty WA0GEH!).  Tom KE7KCK lead the students to the landing site, Jim 'RPS delivered the 304 payloads to Tom KE7KCK for delivery back to K0SCC.
Mike Weezer and his family were very nice once they figured out I wasn’t trying to sell them something!  They declined our offer to check out the payloads, something about a football game they wanted to watch.  Go Huskers!!
And Kraig Murphy, KD7JNQ (2017 Eclipse Liaison for Goshen County Sheriff) drove down from Torrington WY.
 Last but certainly not least John N0JPS who skillfully cut down both 304 & 305 following the outstanding instructions from Mark KC0D (who called us to make sure we weren’t having issue doing it).
If I have inadvertently missed someone/something let me know.
Original Announcement: 

11/6/20 Launch Site Changed to Wiggins11/6/2020:  The communications plan has been updatedThe Wiggins directions have been updated and may be found here: Wiggins Launch siteThis will be 2 x 1500 balloons.  Payload Plans Rev B are posted.  Note 306 beacons are now EOSS-305.The preflight prediction can be found here.Eoss

Event Date: 
Saturday, November 7, 2020 - 00:00
Flight Coordinator: 
Launch Site: 
Rt 71 & 14 (West) X 30 Y 40 Test: N 41.000 • W 103.000 X 65.2 Y 66.9


Balloon Type: 
1500g latex
12 ft Rocketman Orange/Green
144.340K0SCC-14APRS / Digi Slotted 07/27 Digi EOSSD


Balloon Type: 
1500g latex
12 ft Rocketman Orange/Green
144.905 MHzKC0D-14APRS/Release/DF
144.340 MHzAEØSS-13APRS / Digi Slotted 10/40 Digi EOSSX

Preflight Net:

  • Friday October 30th @ 7PM (Note Time)
  • 449.225 minus offset with a 141.3 Hz tone "Fun Machine”.

Analog T&R Repeater:

  • RMRL 449.450 minus offset with a 103.5 Hz tone.


  • RMHAM DMR “Rocky Mountain Wide" has been approved for EOSS 304/305.  W9CN will have EOSS#1 Deployable DMR repeater operating from his truck.

The Usual EOSS Simplex Frequencies (UESF) will be used:

  • Ground Station - 446.050
  • EOSS 304 T&R - 446.100
  • EOSS 305 T&R - 446.150
  • Spare T&R - 446.200
  • Car to Car drive out coordination - 446.2750 

Note: We are going to be in a “zone of darkness” for repeaters.  We will be relying on simplex and we need to make sure we have the T&R teams using the right frequencies.

2M Direction Finding Frequencies:

  • 144.340
  • 144.905
  • 145.645
  • 145.765


Tactical Calls: 
TacticalCall SignNameNotes
BravoW9CN, N0JPSMike, John
Ground StationK5JK, N0Call, N2XGLTom, Randy, Jeff
TangoKC0LJohn from Texas, IRLP
GolfK0NKK, K0JWBNancy, John
Mike KD7JNQKraig
TR Breakfast: 
Drovers Culinary Cafe 28601 US Hwy 34 Brush CO 80723 (970) 842-4218 6 AM