X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Sender: To: lml Date: Sun, 17 Dec 2006 23:10:07 -0500 Message-ID: X-Original-Return-Path: Received: from smtp110.sbc.mail.mud.yahoo.com ([68.142.198.209] verified) by logan.com (CommuniGate Pro SMTP 5.1.3) with SMTP id 1684092 for lml@lancaironline.net; Sun, 17 Dec 2006 15:28:11 -0500 Received-SPF: none receiver=logan.com; client-ip=68.142.198.209; envelope-from=elippse@sbcglobal.net Received: (qmail 76624 invoked from network); 17 Dec 2006 20:27:20 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=sbcglobal.net; h=Received:X-YMail-OSG:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=pWUWdrmpMlSe1ptgJ2zW+N+AhNskmeGOEp8pLhFJzhoAlL2/hVV7SqiJZWKefWHwWMkPin15fSZwQK5sWElL/Wq+ydxdsSoF302aloIj5HmvGfWK+4EP6A6E/AxhzzgozCWaBWOI5V1opOKdfWLvA5gE295bpFtBy7S5bqxQKzE= ; Received: from unknown (HELO Computerroom) (elippse@sbcglobal.net@69.227.129.4 with login) by smtp110.sbc.mail.mud.yahoo.com with SMTP; 17 Dec 2006 20:27:19 -0000 X-YMail-OSG: ejBsYZIVM1kwnjj8DgTJcxuuLUGFj6aX7dYAWZFo5cbp_2g5l4RquaWbVmf0kKRyXHNQagZC5mu1EE_2J6pjIcd1amtdaxDJvyerKvn7Hvfs5JOi75mmE8k6LbbW65WytitPw4J5VavffYM- X-Original-Message-ID: <001301c72219$c0389950$0481e345@Computerroom> From: "Paul Lipps" X-Original-To: "Marv Kaye" Subject: Avionics EMI/RFI X-Original-Date: Sun, 17 Dec 2006 12:27:17 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01C721D6.B0DD0060" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_000E_01C721D6.B0DD0060 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable My little ICS+ Nav/Com/Glideslope/Localizer seems to be very sensitive = to avionics-generated RFI; I have to have the squelch at max to keep out = hiss! I'm not sure how it's getting into the receiver, but I think it = may be as antenna currents on the coax which are picked up near the = receiver and then go out and enter the VOR and GS antennas mounted in = the inner wings. The other day I was doing some signal sniffing with my = ICOM A4 and its rubber-ducky, and I found I needed the A4 squelch set = all the way up to 7 (of 9) to get rid of the hiss. I turned off my Dynon = and still got hiss from my TruTrak Pictorial Pilot. I turned it off and = got hiss from my Dynon when on. Originally, the Dynon was really bad = until I installed the $10 filter-dongle I obtained from Dynon and = installed it on the input connector. That A4 is really great for signal = sniffing, since you can scan the whole Comm band in small steps and keep = playing with the squelch to seek out the various interference = frequencies. These avionics units with their digital divider circuits = put out lots of harmonics. That's why you may get interference on one = frequency but not on another. Surprisingly, the little Radio Shack = 14V-6V 1A buck-converter I installed in back of the instrument panel to = power my Delphi XM receiver was quiet! ------=_NextPart_000_000E_01C721D6.B0DD0060 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
My little ICS+ Nav/Com/Glideslope/Localizer = seems to be=20 very sensitive to avionics-generated RFI; I have to have the squelch at = max to=20 keep out hiss! I'm not sure how it's getting into the receiver, but I = think it=20 may be as antenna currents on the coax which are picked up near the = receiver and then go out and enter the VOR and GS antennas = mounted in=20 the inner wings. The other day I was doing some signal sniffing with my = ICOM=20 A4  and its rubber-ducky, and I found I needed the A4 squelch = set all=20 the way up to 7 (of 9) to get rid of the hiss. I turned off my Dynon and = still=20 got hiss from my TruTrak Pictorial Pilot. I turned it off and got hiss = from my=20 Dynon when on. Originally, the Dynon was really bad until I installed = the $10=20 filter-dongle I obtained from Dynon and installed it on the input=20 connector. That A4 is really great for signal sniffing, since you can = scan the=20 whole Comm band in small steps and keep playing with the squelch to seek = out the=20 various interference frequencies. These avionics units with their = digital=20 divider circuits put out lots of harmonics. That's why you may get = interference=20 on one frequency but not on another. Surprisingly, the little Radio = Shack 14V-6V=20 1A buck-converter I installed in back of the instrument panel to power = my Delphi=20 XM receiver was quiet!
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