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Kerwin
PostPosted: Wed Oct 20, 2004 6:26 pm 
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Joined: Sun Mar 07, 2004 4:20 pm
Posts: 125
Location: Lincoln 1
Between 7:05 and 7:15 PM PDT Oct 20th I noticed 2 stations using what sounded like speech inversion scrambling on 147.300 mhz. The stations were simplex and seemed to be in motion based on signal variations.

Is there any software that can decode this?

Kerwin
North Seattle
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Kevin
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PostPosted: Thu Oct 21, 2004 12:37 am 
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Joined: Thu Feb 19, 2004 7:40 pm
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Location: Glendive, MT
There's software on this page:
http://www.personainternet.com/~northscan/files.html

Kevin


Last edited by Kevin on Thu Oct 21, 2004 10:12 am, edited 1 time in total.

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John
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PostPosted: Thu Oct 21, 2004 12:48 am 
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My icom r7000 used to defeat the old mororola speech inversion cordless phones by simply hitting the single side band buttion and doing a little tuneing.

Is it possible you heard a ham in ssb mode?
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Kerwin
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PostPosted: Thu Oct 21, 2004 6:27 pm 
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Location: Lincoln 1
It sure seemed like FM carrier modulated by inverted speech.
I don't have the abiltity to TX or RX SSB on that band but it didn't sound like SSB.
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Mark
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PostPosted: Thu Oct 21, 2004 6:59 pm 
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Joined: Thu Feb 19, 2004 2:23 pm
Posts: 2004
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It's not SSB, it's just that that mode makes it so you can hear speech inversion. Another way to get clear communications is with two FRS radio's with the speech inversion option. Transmit the audio from the scanner on one FRS radio - with the speech inversion turned off. Turn inversion on on the other (receiving) FRS radio and you are in business with clear voice.

-m
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MTM
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PostPosted: Fri Oct 22, 2004 12:27 am 
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Location: Radio Land
:D I love it when a plan comes togather. Great move. Way to go Mark. MTM
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bcradio
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PostPosted: Fri Oct 22, 2004 1:51 pm 
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Joined: Sat Feb 21, 2004 10:10 am
Posts: 33
Location: Victoria BC
Just a quick question for you guys.. Is speech inversion allowed on US Ham Bands? Here it's considered a form of encryption (low tech I know, even CSIS could break it)
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