Announcement of EOSS-75

Originally, this day was planned to include two balloon flights. However, a reduction in the number of payloads allowed us to fly a single 3000 gram balloon. Below is the flight announcement as it appeared the Friday before the flight.

EOSS-75 and EOSS-76

LAUNCH DATE: April 17, 2004
LAUNCH TIME: Target times, balloons must be launched with a minimum 45 minute separation between the two.

If we fly a single 3000 gram balloon

• EOSS-75 - 08:00 (14:00 UTC)

If we fly two 1200 gram balloons

• EOSS-75 - 08:00 am (14:00 UTC)
• EOSS-76 - 08:45 am (14:45 UTC)

LAUNCH SITE: Windsor, Co (directions)

EOSS 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 (tentative)
  • 146.550 MHz simplex (same simplex for field and launch ops)
  • There may be FRS operations see THIS PAGE for a list of channel numbers and their associated UHF Frequencies.
  • 146.970 MHz Sidney, NE
  • 146.910 MHz Stirling, CO
  • 7.228 MHz HF

If we fly one 3000 gram balloon

EOSS-75

• Beacon
  • 145.600 MHz
  • ID: W5VSI in CW
• APRS
  • 144.340 MHz (primary APRS)
  • ID: W5VSI-11

If we fly two 1200 gram balloons

EOSS-75

• Beacon
  • 145.600 MHz
    • ID: W5VSI in CW
• APRS
  • 445.975 MHz
    • ID: KØYUK-11

EOSS-76

• Beacon
  • 147.555 (CW, tone, Packet burst)
• APRS
  • 144.340 MHz (primary APRS)
    • ID: W5VSI-11
  • 147.555 MHz (backup)
    • ID: KØANI-11

Flight Systems:

EOSS-75 (single balloon profile)

EOSS-75 + EOSS-76 (Two 1200 gram balloons)

Payload Configuration:

Due to a recent change in payloads, the Payload Plan has been revised (16-Apr-04). We will either launch a single 3000 gram balloon, or two 1200 gram balloons. All three payload configurations are shown in the Plan. But remember, we will either be flying the first configuration or the second two.

• Payload_Plan_75_76B.pdf

EOSS Grid:

Tactical Callsigns:

Notes:

General

These two flight are in support of Colorado University's Space Grant flights and the Lockheed Martin explorer's group.

HF Radio

Usually starts 30 minutes