Balloon Flight D-5, 28th June 2014
Balloon D-5 has been a part of the Ham Radio exhibition stratosphere launch in Friedrichshafen, Germany. I haven't
been able to launch there personally, so a friend of mine assisted me to launch there. D-5 is actually the same
package as D-3 with some modifications containing weight improvements in the first place.
Also the Voltage regulator has been changed. That one I used for D-3 had a huge Voltage drop (1.2V) that made a
heatsink and 4 batteries necessary. Due to the new regulator this time I only needed 3 batteries. All in all the
whole package reached a runtime up to 6:30h at the test run which is good enough for one flight.
I was asked many times about why I'm using a paper box instead of a styrofoam box. Well... my possibilities in
making a custom box is limited and the heat, which was generated during the flight is that much, I don't need more
insulation. The whole package draw about 460mA (the Raspberry PI takes about 400mA and that makes much heat).
What about landing in water? Won't it be drawn? Ops... Shit happens ;)
=> 149 g
- one battery less
- got rid of heatsink
- got rid of large and heavy box
- smaller battery holder needed
- Custom antenna (spring steel) instead of that one I bought for my handheld
Due to low coverage of this area I decided to switch the transmission rate from 600 baud to 300 baud which has been
good for station operators doing SSDV for the first time. My opinion: That has been a good decision.
The launch pad has been Friedrichshafen Airport.
In addition there has been multiple other payloads on the same flight which I don't want to explain on this page
in all details. There has been payloads that did APRS, SSTV, Voice (telemetry) and some other stuff.
Payload: Raspberry PI + Camera, NTX2b, uBlox MAX7-C
Battery: Varta Lithium AA (3x)
Payload weight: 149g
Frequency: 434.150 Mhz USB, vertical polarized
Mode: RTTY 300/880 8N2 SSDV + Position
Power: 10 mW
Balloon: currently unknown
Gas: currently unknown
Launch time: 28th
June 2014 - 0925Z
Launch pad: Friedrichshafen, Germany
Unfinished payload at work
SSDV transmitted Images