X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 02 Jul 2005 12:44:42 -0400 Message-ID: X-Original-Return-Path: Received: from [204.127.198.39] (HELO rwcrmhc12.comcast.net) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1029302 for lml@lancaironline.net; Sat, 02 Jul 2005 07:09:47 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.198.39; envelope-from=mjrav@comcast.net Received: from mark1 (c-65-96-140-242.hsd1.ma.comcast.net[65.96.140.242]) by comcast.net (rwcrmhc13) with SMTP id <2005070211090201500598bke>; Sat, 2 Jul 2005 11:09:02 +0000 X-Original-Message-ID: <003b01c57ef7$74eb3280$f28c6041@mark1> From: "Mark Ravinski" X-Original-To: "Lancair Mailing List" Subject: Re: [LML] Radio Static X-Original-Date: Sat, 2 Jul 2005 07:16:12 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0038_01C57ED5.ED6266B0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1506 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506 This is a multi-part message in MIME format. ------=_NextPart_000_0038_01C57ED5.ED6266B0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Paul, I had some wierd static from the alternator brushes when they wore down = short. This doesn't seem to fit your cause and effect pattern but it's = easy to check for in flight by shutting down the alt. I expect you've = probably already tried to trace this by alternately killing systems. When I got the plane, about 9 years ago, the radio shop I went to = couldn't get satisfactory performance on the internally mounted antenna. = Their solution was to mount an external belly whip with a ground plane = of about 12" square under the passenger seat. In the interest of trying = to beat Larry Henney in the Airventure Cup Race, I've since mounted the = whole assembly inside the tail cone. Mark Ravinski N360 KB =20 After about one half hour of flight, I frequently get static on VHF comm = channels. It usually grows with time until radio reception is marginal. = Strangely, the static isn't a problem in the terminal area at the end = of a flight. My antenna is a dipole, mounted inside the vertical fin. = I suspect that a static charge on the skin may be responsible. The skin = surfaces are not grounded. Has anyone else had this problem? If so, = how have you solved it?=20 Thanks, Naf Paul Nafziger LNC2 N7PN ------=_NextPart_000_0038_01C57ED5.ED6266B0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

Paul,

I had some wierd static from the = alternator=20 brushes when they wore down short. This doesn't seem to fit your = cause and=20 effect pattern but it's easy to check for in flight by shutting down the = alt. I expect you've probably already tried to trace this by = alternately=20 killing systems.

When I got the plane, about 9 = years ago, the=20 radio shop I went to couldn't get satisfactory performance on the = internally=20 mounted antenna. Their solution was to mount an external belly = whip with a=20 ground plane of about 12" square under the passenger seat. In the = interest=20 of trying to beat Larry Henney in the Airventure Cup Race, I've since = mounted=20 the whole assembly inside the tail cone.

Mark Ravinski

N360 KB

After about one=20 half hour of flight, I frequently get static on VHF comm channels. = It=20 usually grows with time until radio reception is marginal. = Strangely, the=20 static isn't a problem in the terminal area at the end of a = flight. My=20 antenna is a dipole, mounted inside the vertical fin. I suspect = that a=20 static charge on the skin may be responsible. The skin surfaces = are not=20 grounded. Has anyone else had this problem? If so, how have = you=20 solved it?

Thanks,

Naf

Paul Nafziger

LNC2=20 N7PN

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