Uhuh - and how many of you have worked such DX?<smile>
The signal level seen on earth is 4E-19 or -196 dBw (subtract 30-dB
to yield -166 dBm). The path loss at Pluto (31.9AU) is without
including antenna gain 303.5 dB. Interesting that I read they plan
to run 600bps at 36AU.
Other numbers of interest is downlink f=8.438 GHz, downlink antenna
(2.1m dish) gain is +42 dB and Tx power is 12-15w (say +41 dBm);
spacecraft EIRP = 42+41 = +83 dBm. -303.5+83 = -220.5 dBm. Add gain
of ground antenna +73 dBi (70m dish): -220.5+73 = -146.5 dBm
Your K3 MDS is -145 dBm at B=500 Hz
Just for grins I substituted my dish (4.9m) with gain 49.7 dBi and
signal to my Rx would be -220.5+49.7 = -170.8 dBm
If I use a really narrow bandwidth I might see a signal trace using
something like spectravue sw.
A ham has received Pioneer's signal in such a manner when it was
beyond Pluto's orbit. It was not easy!
73, Ed - KL7UW
-----------------------------------------------
From: brian <als...@nc.rr.com>
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] QRP signals from Pathfinder probe (off topic)
Message-ID: <55a80893.4040...@nc.rr.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
It would seem that the DX record is held by the Voygers which long ago
left the solar system.
I don't know their power but they still check in from way beyond
Pluto. So NewHorizons is DX but not real DX YET.
73 de Brian/K3KO
On 7/16/2015 18:31 PM, Scott Simpson wrote:
> some discussion including calculation of losses around 147db here:
>
>
https://www.reddit.com/r/amateurradio/comments/3d93en/the_radio_signal_from_the_new_horizons_spacecraft/
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubus...@gmail.com
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