Andy Nguyen an at comms.net.au
Thu Jul 17 11:41:18 EST 2014

Hi Jamie,
For the VK3YT-x PICO balloons that was pretty much it!
There were some smarts in some versions to calculate ISS passes and attempt to send aprs packet to ISS but the conclusion was 10mw on a balloon was not enough for ISS.

> On 17 Jul 2014, at 8:47 am, vk2ycj at bravo.net.au wrote:
> Hello,
> The Pico Balloons sent off by Andy VK3YT has been very inspiring to lots
> of people - me included.  I'm amazed !
> I'm running VHF APRS on 2m in the car and would like to try HF APRS in the
> car on 30m.
> Later something in a balloon might be fun too.
> So, as I understand it, in the car on VHF APRS we use smart beaconing to
> keep the resolution of spots up but with minimal packets to prevent VHF
> channel congestion.  Correct ?
> I'm not sure what HF APRS does in the car - but my guess is that it
> reduces the spot resolution to give enough spots to be useful and to
> greatly reduce HF channel congestion.  Correct ?  Any other smarts
> involved ?
> With balloon APRS I assume the beaconing rate is probably set to once
> every 5 minutes - for two reasons - to reduce channel congestion and to
> preserve battery life.  PIC and Arduino type controllers can be put to
> sleep for 4.5 minutes to reduce battery drain to almost nothing - then
> woken up to collect the GPS and other data and then used to transmit a
> packet - then put to sleep again.  Correct ?  Any other smarts involved ?
> Thanks,   Jamie - VK2YCJ
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