[amsat-bb] Inmarsat L-Band Sample IQ File?

Ken Swaggart k.swaggart at charter.net
Sat Dec 5 22:27:49 UTC 2015

I've been monitoring the Pacific Inmarsat at 178 east on 1541.450 MHz. This 
is the only channel that has traffic in the clear. It consists of distress 
messages, weather, and other traffic of interest to merchant shipping. There 
is an Atlantic satellite, but, since I can't see it from my QTH I didn't 
save and info about it.

Here are a couple of IQ files. I was using an AirSpy decimated by 64 with 
sample rate set to 2.5 MSPS. The antenna was a 10 turn homebrew helix (now 
rebuilt to 20 turns):

Occasionally I upload the messages I've received a web page:
(not much happening today!)

Ken, W7KKE

-----Original Message----- 
From: Scott
Sent: Saturday, December 5, 2015 14:12
To: amsat-bb at amsat.org
Subject: [amsat-bb] Inmarsat L-Band Sample IQ File?

I sure hope this isn't too far off-topic, but I would imagine that a lot of 
Amsat people enjoy other satellite activities as well.

I've searched but have not found any sample IQ .wav files of L-Band InmarSat 
data streams.  It sure would be helpful to know what I'm looking for when I 
scan around the 1.5 GHz area.

I'm also quite anxious to test the new JAERO software but of course you need 
a signal (live or recorded) to see anything decoded.

If anyone has a URL for sample Inmarsat files, I sure would appreciate it.


-Scott, K4KDR
Montpelier, VA  USA
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