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 ;)

Weight Improvements
=> 149 g

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