Long duration flight taking advantage of east to west 30km high altitude winds. Aiming for launch before 4/6/12.

• 434Mhz RFM22b Tracker
  • Arduino
  • RFM22b
  • Ublox GPS
  • Continous Telemetry
  • 10mW over UK, 100mW out to sea
• APRS Tracker
  • Based on stripped Baofeng UV-3R Handheld
  • Arduino - PWM to create tones and control radio
  • Aim for APRS packet on Europe - 144.800, APRS Sats 145.825 and North America 144.390
  • May require qrptracker to known when Sats overhead
• Float Valve (phase 1) & Ballast (phase 2) system
  • uBlox GPS + PIC + RFM22b
  • Servo operated valve

• Build RFM22b tracker - jcoxon
  • Replace V Reg - jcoxon
• Code for 434 tracker - jcoxon
  • Fix higher power - jcoxon
• Order UV-3R radio - done from HK, dispatched
• Strip down UV-3R
• Run on energizer lithiums
• check if UV-3R can do packet from ATmega
• Test ISS uplink via APRS
• H2 vs He
• Simple enclosure
• Payload design
• Geofence UK, APRS only turns on when out to sea
• Vent valve to maintain altitude - Rocketboy
• ?Ballast

• 70cm (434Mhz) Tracker - jamescoxon GitHub

• Aim to launch 26/27 May 2012 - to test float capabilities
• He 1600g Balloon
• Single 434Mhz Tracker
  • Setup to tx 10mW over UK, up to 100mW out to sea
  • Test Eurus code
• Current Status
  • Payload setup, working
  • Needs payload box, power supplies, testing,
  • Range tested - works well at 1.5km on ground, can hear signal at 2.3km
  • Test todo: Freezer test (with lithiums), long duration test
  • Completed: Payload, antenna,
  • To construct: GPS cable, Payload box, ?backup tx'er

• Jobs
  • Buy batteries
  • Wire up battery packs
  • Glue battery packs in place
  • Add on/off switch
  • GPS cable (directly solder to GPS)
  • Attach Antenna

• 640 = 4.2v (in) 2.1v(out)
• Therefore to calc battery voltage Batt = Raw / 155
• Cuts out at ~510
• Mass = 250g (inc batteries, insulation and antenna)

• 4 radials
• function to check radio is working
• ? just use NTX2
• don't bother with higher power (killed setup)
• integer lat/lon worked?