[Noisebridge-discuss] Spacebridge launch planning meeting, Sunday 1/10, 5pm

Joel Jaeggli joelja at bogus.com
Thu Jan 7 05:50:54 UTC 2010



Christie Dudley wrote:
> I hope to know a lot more about radio come time for the meeting as I
> plan on attending the Ham Cram on Saturday.  

Ham cram is not quite the worst place to learn about radio but it's
pretty close. On the other hand it's great if you want to pass the test.
I wholeheartedly recommend it for the latter.

> At the heights we're talking about sending this thing, I do think the
> concerns that Jof has raised about insulating the batteries are important. 
> 
> 
> _______
> Getting to the bottom of the hill is convenient. The view from the top
> of the hill is stunning. Where would you choose to live?
> 
> 
> On Wed, Jan 6, 2010 at 7:55 PM, Jonathan Lassoff <jof at thejof.com
> <mailto:jof at thejof.com>> wrote:
> 
>     Excerpts from Mikolaj Habryn's message of Wed Jan 06 18:44:18 -0800
>     2010:
>     > I know nothing about radio :P how much power and weight would a
>     > transmitter sized for 30 miles clear-air range require?  And it is
>     > feasible to have a bidirectional link, or would it require being able
>     > to orient an antenna on the balloon itself?
> 
>     If you have line of sight (available for most of a balloon flight,
>     except for landing/close to ground), you wont need much power with a
>     directional antenna on the ground following where the balloon
>     approximately is. It will probably take more power to transmit than
>     receive.
> 
>     The power source is probably going to be the biggest in terms of weight.
>     Also, depending on how high up you are, you might need a heater or
>     insulation to keep the cells warm enough to function.
> 
>     I haven't looked at this kind of thing in ages, but I would think
>     whatever's the lightest, lowest power radio (that you can use legally,
>     ham radio, ISM, etc.) you can find should do.
> 
>     Closer down to the ground, maybe use the 3G in the *droid?
> 
>     --j
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