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

[Paul Stoetzer]

It definitely wasn't PSK31. I'll post the audio of it when I get a 
chance tomorrow.

73,

Paul, N8HM

On 10/5/2013 10:09 AM, Stefan Wagener wrote:
> At one point, folks were using PSK31 on FO-29.
>
> Check the waterfall and see how it looks like :-)
>
> Stefan, VE4NSA
>
>
> On Sat, Oct 5, 2013 at 8:25 AM, Robert Bruninga <bruninga at usna.edu 
> <mailto:bruninga at usna.edu>> wrote:
>
>     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.
>
>     Bob, WB4APR
>
>     On Fri, Oct 4, 2013 at 4:51 PM, Paul Stoetzer <n8hm at arrl.net
>     <mailto: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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>