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[aprssig] GO-32 APRS Receiving tests.

John Ronan jronan at tssg.org
Sat Oct 13 18:57:38 UTC 2007


TH-D7 sitting on my deck at the back of the house, tuned to 433.225.

Received status message at 4XTECH-12  18:46:30

Antenna is a Diamond RH77CA with BNC to SMA adaptor (I couldn't find  
the other whip).

Couldn't hear a thing on the Co-linear in the attic.

Regards
de John
EI7IG
On 8 Oct 2007, at 01:19, Robert Bruninga wrote:

> APRS folks:
>
> GO-32 is enabled for 9600 baud mobile APRS satellite
> experimentation.
> See:
>
> http://www.ew.usna.edu/~bruninga/GO32-ops.html
>
>
> We have already shown that a D7 with a 19" vertical whip on an
> overhead pass can get a lucky packet in.  A D700 mobile with 50
> watts can get in every time (if no collision).
>
> Now we need to verify the performance of the downlink to mobiles
> (and Igates) with omni antennas.  This downlink is about 20 dB
> worse because it is on UHF (- 9 dB) and because the satellite is
> using only a 4W? Downlink compared to the 50W mobile.
>
> But even if each omni antennna ground station only copies
> packets twice a day during the central 5 minutes of an overhead
> pass, then with enough such simple groundstations feeding the
> global APRS network, then most packets will be captured.
>
> So if you have a D700 parked in the open sky between 8 to 12 AM
> and PM local time and can set it for 9600 APRS, then let us know
> what you pick up.  See the web page for details.  You should get
> some packets in the middle of that time period...
>
> Bob, WB4APR
>
>
>
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--
John Ronan <jronan at tssg.org>, +353-51-302938
Telecommunications Software &  Systems Group,  http://www.tssg.org







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