[amsat-bb] Re: Digital QRM on FO-29 (DF opportunity!)

Robert Bruninga bruninga at usna.edu
Sat Oct 5 06:25:44 PDT 2013

Wow, a GREAT DF opportunity and exercise.  The Doppler info is there
to determine its location.  Just plot the doppler and note the center
point and draw a line of bearing through it.  Combine with others and
find the source.

heh heh... though, complicated by having to subtract out your own...
But we should develop these techniques.  They are the basis of all of
the original Search And Rescue satellite systems.

In fact!!!  Why not get a few hams in a few areas of the country to
operate a CW carrier (at low power) at a known frequency in 4 corners
of the US and let evreyone practice their techniques.  This way, we
learn how to do it on a known signal.

Just a thought.


On Fri, Oct 4, 2013 at 4:51 PM, Paul Stoetzer <n8hm at arrl.net> wrote:
> During two passes of FO-29 - at around 0120Z last night and around 1430Z
> this morning, I've heard some QRM that sounds like a digital signal. I
> confirmed that others heard it too and it wasn't local QRM, so it's
> obviously being relayed by the satellite. Downlink is around 435.860 MHz (I
> heard it around 435.865 last night as the satellite was approaching and
> around 435.855 MHz this morning as the satellite was moving away), so the
> signal is likely being transmitted around 145.940 MHz.
> Has anybody else heard it? Any ideas on what the source might be?
> 73,
> Paul Stoetzer, N8HM
> Washington, DC
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