[Elecraft] QRP signals from Pathfinder probe (off topic)

[Jeff Stai]

I decided to spend a minute googling, here's a paper with a lot of cool
tech details:

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.466.3341&rep=rep1&type=pdf

73 jeff wk6i

On Thu, Jul 16, 2015 at 11:31 AM, Jeff Stai <wk6i.jeff at gmail.com> wrote:

> Well, at least they have big antennas. ;) I read the other day on the NOVA
> website that New Horizons will be downloading the data acquired in the
> flyby at a data rate of only 1 kb/s - think "1200 baud modem" for those of
> you old enough to remember them. And there was another fascinating article
> there about how they use Reed-Solomon error correcting codes to compensate
> for the inevitable bit errors and reduce the need for retransmission (and
> now using the same RS code for DNA data storage, very cool stuff.)
>
> Nothing about the path loss, but knowing the data rate is so low, and that
> the RS code is probably good for a considerable error burst of several
> bits, that should at least give you a sense of what the loss might be!
>
> 73 jeff wk6i
>
> On Thu, Jul 16, 2015 at 11:10 AM, <ac5p at sbcglobal.net> wrote:
>
>> Heard last night on  Nova program that the transmitter on the Pathfinder
>> Pluto probe was 10 watts.  Anyone have a clue as to the signal path loss at
>> 3 billion miles and what levels the deep space dish receiving networks are
>> dealing with?   Incredible that the data stream can be extracted from the
>> noise.
>> Mike  AC5P
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>
> --
> Jeff Stai ~ wk6i.jeff at gmail.com
> Twisted Oak Winery ~ http://www.twistedoak.com/
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-- 
Jeff Stai ~ wk6i.jeff at gmail.com
Twisted Oak Winery ~ http://www.twistedoak.com/
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