Announcement of EOSS-79

Launch Site MOVED to Windsor

Because of the move to Windsor changes are marked in Red

Note: We will be flying EOSS-79a and EOSS-79b. However, Edge of Space Sciences will only be responsible for EOSS-79a. The "B" flight will be handled entirely by Montana State University with their own RF payloads and recovery operations. EOSS Tracking & Recovery should be ready to assist but their prime responsibility this time out is EOSS-79a.

Note2: If at all possible, always check this website or listen in to the preflight net (frequency below) the night preceding the flight for late breaking news regarding flight status.


LAUNCH DATE: June 19, 2004

  • EOSS-79A LAUNCH TIME: 07:30 am MDT (13:30 UTC)
  • EOSS-79B LAUNCH TIME: 08:15 am MDT (14:15 UTC)

LAUNCH SITE: Windsor, Co (Directions)

EOSS Frequencies:

Global Frequencies

  • Preflight Net:
    • 147.225 MHz 8 pm MDT preceding Friday night
      • 145.160 MHz simulcast in the Springs
    • 146.640 MHz will serve as a backup frequency
  • Tracking and Recovery Operations
    • 449.450 MHz RMRL Repeater (103.5 Hz tone)
    • 146.550 MHz simplex (same simplex for field and launch ops)
    • Repeater Coverage Spreadsheet - Benjie has created this spreadsheet that shows many of the repeaters in the expected recovery area.
    • There may be FRS operations see THIS PAGE for a list of channel numbers and their associated UHF Frequencies.
    • 7.228 MHz HF

EOSS-79 A (Primary EOSS system)

  • Beacon
    • 147.555 MHz
      • ID: W5VSI in CW
  • APRS
    • 144.340 MHz
      • ID: W5VSI-11
    • 144.390 MHz (NEW - added Friday)
      • ID: AC0AK-11

EOSS-79 B (Montana State University)

  • APRS
    • 145.600 MHz (Kenwood D7)
      • ID: KD7NPX-11
    • 445.975 MHz (TinyTrack3)
      • ID: KD7NPX-10

Flight Systems:


Balloon Manufacturer Kaymont
Balloon Type latex
Balloon Size 3000 gram
Payload @ 25.3 lbs.
Free Lift % calculated at fill
Ascent Rate 1000 fpm estimated
Descent Rate  900 fpm estimated
Parachute 10 ft. diameter
Peak Altitude determined after flight
Launch Conditions determined at launch



Balloon Manufacturer Kaymont
Balloon Type latex
Balloon Size 1200 gram
Payload < 12 lbs.
Free Lift % calculated at fill
Ascent Rate 1000 fpm estimated
Descent Rate 1000 fpm estimated
Parachute 5 ft. diameter
Peak Altitude determined after flight
Launch Conditions determined at launch

Payload Configuration:

EOSS Grid:

Location Grid X Grid Y
Hiway 71 and 14 (west intersection) 70 40
Ft. Lupton 10 5
Rockport 11 60
Nine Mile 75 8
Launch Point 2.62 30.57
Predicted Touchdown 78.8 56.9

Tactical Callsigns:

Tactical Callsign Name Notes
Alpha WA0GEH Marty coordinator
Alpha WA0GEH by N0NDM Larry asst. coordinator
Bravo KB0YRZ Chris  
Bravo (2) KC0RPS James  
Charlie K0JLZ Jim  
Charlie (2) K0AEM Richard  
Delta N0PUF Dan  
Echo K0ANN Ann  
Foxtrot KC0LZE Shawn  
Golf AC0AK Mark  
Golf (2) KC0QYU Kyle  
Hotel W0CBH Benjie triangulator, asst. coordinator
Juliet KC0RIA Mark Air One Helio
Kilo N0LP Nick Ground Station

Flight Personnel

Name Org Callsign 449.450/146.550
Chris Koehler CoSGC ----- N
Randy Collander EOSS/NOAA   N
Chris Krengle EOSS KB0YRZ Y
Benjie Campbell EOSS W0CBH Y
Bill Hiscock MSU KD7MFF Y
Mark MSU ----- N
Sean Kern MSU KD7NPX Y
Ground Station EOSS K0YUK, W5VSI, N0LP Y
Mark Caviezel ES-OS AC0AK Y


Our Customers

EOSS-79 supports the NASA Space Grant BalloonSat Workshop, an event sponsored by Colorado Space Grant annually since 2002, where faculty from other NASA Space Grant colleges all over the US come to learn how to set up and teach a course like CU's one-semester undergrad "Gateway to Space". Attendees are teamed up to design and build BalloonSats from kits, not unlike the ones that the Gateway students do.

BalloonSats are typically 10 cm cubes weighing up to 600 gm (1.32#) each with vertical thru-tube flight string attachments. Each carries a still camera with a shutter timer and another experiment that gets logged by an on-board Hobo.

This year, Chris had some 43 attendees sign up in January. There have been a few last-minute cancellations, however. So until I hear further from Chris, we're planning on flying a total of 8 BalloonSats on EOSS-79 -- 4 on each of two strings.

EOSS-79A will be operated by EOSS, while EOSS-79B will be managed by Mt. State U. EOSS will handle FAA reporting for both, and will help out on tracking and recovery as required.

In order to minimize logistics issues with getting students from launch to recovery, Chris Koehler would prefer to launch both balloons simultaneously. But the FAA says that's OK only if we get 'em both on the deck by 0930; any later than that, we'll have to space the lauches by 40 minutes to avoid having two balloons in heavy arrival airspace at the same time.

HF Radio

Usually starts 30 minutes, frequency posted above