Multi balloon launch in Australia to promote Go Pro Hero 3

Early next week we will be flying 15 balloons in three launches of five over two days.

The location is Rankins Springs in NSW Australia -33.8400 146.2584
Payloads as follows.
All payloads  50 baud,7 bits, no parity, 2 stop bits.
Tuesday 20th Launch at 8:00am EST
Apollo 25mW 434.650MHz 600Hz shift  (0 seconds)
Starbuck 25mW 434.650MHz 350Hz shift  (20 seconds)
Hot Dog 25mW 434.650MHz 600Hz shift  (40 seconds)
Racetrack 25mW 434.075MHz 600Hz shift  (0 seconds)
Skulls 10mW 434.075MHz 600Hz shift (20 seconds)
Tuesday 20th Launch at 11:00am EST (potentially delayed by recovery of previous launch)
Maverick 25mW 434.650MHz 600Hz shift  (0 seconds)
Iceman 25mW 434.650MHz 350 or 600Hz shift (20 seconds)
Goose 25mW 434.650MHz 600Hz shift  (40 seconds)
Viper 10mW 434.075MHz 600Hz shift  (0 seconds)
Jester 10mW 434.075MHz 600Hz shift  ,7 bits, no parity, 2 stop bits. (20 seconds)
Wednesday 21  Launch at 8:00am EST
Enterprise 25mW 434.650MHz 600Hz shift  (0 seconds)
Columbia 25mW 434.650MHz 350 or 600Hz shift  (20 seconds)
Discovery 25mW 434.650MHz 600Hz shift  (40 seconds)
Atlantis 25mW 434.075MHz 600Hz shift (0 seconds)
Endeavour 10mW 434.075MHz 600Hz shift (20 seconds)
I noticed some of the 434.075MHzc 10mW modules where down near 434.065Mhz out of the box, so you might need to hunt around a bit.
Launch site is just over 700 clicks form Adelaide and we are using mostly 25mW modules so we could see some long range tracking from the Horus crew.
Multiple Ballons and Time Series Multiplexing
Payloads are split amongst the  434.075 and the 434.650MHz frequencies, I thought about trying to be smart an play with the adjustments on the modules but  decided against it,
As recently brought up on the list we are going to be time multiplexing the telemetry. Nothing fancy really as relative HAB newbies (one previous flight) we a taking a slow an safe approach having each ballon transmit once a minute in a dedicated time slot. Time sync is defined from GPS with a fall back / emergency mode if it detects that GPS no longer updating.
One of the main thing’s that is brought up when you mention time series multiplexing is the difficulty of tracking multiple payloads with slightly different frequencies in dl-fldigi. At least on the test bench we have found that (at least under os x) simply running multiple instances of dl-fldigi works really well. Obviously would not scale very well but for a few payloads seems to work well.
Flight details 
These are short flights, not aiming for huge altitude here. 300g Totex balloons 1.5 hours total flight time bursting around 17km.
GoPro 3’s 
We got a batch of the new GoPro 3’s so we will let you know how thay work out in flight.
The funding from the flights is coming from advertising, it’s part of a launch for a premium frozen yogurt, the angle is that they use the cold temperatures at altitude to freeze their product.  So there are three temperature sensors on the payload, one internal, one eternal and one for the product.
We are a team of hackers, makers, geeks and when we where asked if we could fly helium balloons (something we had been planning to do anyway) we said sure we can. We already had a name for our group.
St Peters Aeronautical and Space Organisation (SPASO)
For more information DO NOT CLICK HERE
Justin Maynard

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