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Re: Audacity files for AO-27 QRM
- Subject: [amsat-bb] Re: Audacity files for AO-27 QRM
- From: "Mark Saurman" <vo1one@xxxxxxxxx>
- Date: Sat, 22 Sep 2007 08:31:59 -0400
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I took a listen to the audio file and what you're hearing is an
MDC1200 status indicator from a Motorola radio. You typically hear
these on police frequencies but since they're easily modifiable to the
ham bands you'll hear them with the encoder still enabled on ham
radio, too. I took the audio file and decoded it with WinMDCD
(freeware) and it reveals nothing too interesting:
TIME OP ARG ID DESCRIPTION
-----------------------------------------------------
00:00:05.5 01 00 0424 POST UNIT ID
00:00:06.4 01 00 0424 POST UNIT ID
00:00:09.7 01 00 A900 POST UNIT ID
00:00:24.0 01 00 A900 POST UNIT ID
00:00:46.4 01 00 A900 POST UNIT ID
00:00:11.3 NO DECODE
00:00:20.8 NO DECODE
I edited the time stamps to reflect the time shown in the audacity sound file.
73,
Mark
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