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pfstelwagon(at)earthlink.
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 Posted: Mon Mar 07, 2016 4:17 pm Post subject: Auto plug conversion |
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One item no one has brought out was the poor decision years ago to stick with AM radio for aircraft, AM is subject to pulse type interference and these aircraft are huge generators of that. Also poor radio installation wiring is also a major problem, follow the directions provided by the manufacture not the cheapest way. I can't believe some of the trash that I have seen.
Frank
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jan.mevis(at)informavia.b
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| Posted: Mon Mar 07, 2016 11:07 pm Post subject: Auto plug conversion |
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There’s a good reason why AM is still used for VHF communication in aviation: smaller bandwidth.
With FM modulation you have many more side bands (infinitely many, mathematically: the signal can be developed with Bessel functions of the first kind).
If you have a modulation index of 2 (that means: the frequency sweep on the FM signal is twice the angular speed of the modulating signal) then you have at least three side bands on both sides of the carrier, as a rule of fist.
With AM on VHF you get more noise because the noise sits primarily on the amplitude, and that’s exactly what your AM demodulator is detecting.
J.
From: <owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)> on behalf of Frank Stelwagon <pfstelwagon(at)earthlink.net (pfstelwagon(at)earthlink.net)>
Reply-To: "yak-list(at)matronics.com (yak-list(at)matronics.com)" <yak-list(at)matronics.com (yak-list(at)matronics.com)>
Date: Tuesday 8 March 2016 at 01:15
To: "yak-list(at)matronics.com (yak-list(at)matronics.com)" <yak-list(at)matronics.com (yak-list(at)matronics.com)>
Subject: Auto plug conversion
One item no one has brought out was the poor decision years ago to stick with AM radio for aircraft, AM is subject to pulse type interference and these aircraft are huge generators of that. Also poor radio installation wiring is also a major problem, follow the directions provided by the manufacture not the cheapest way. I can't believe some of the trash that I have seen.
Frank
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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