X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Thu, 24 Aug 2006 03:13:23 -0400 Message-ID: X-Original-Return-Path: Received: from vms048pub.verizon.net ([206.46.252.48] verified) by logan.com (CommuniGate Pro SMTP 5.1c.3) with ESMTP id 1346125 for lml@lancaironline.net; Thu, 24 Aug 2006 01:50:58 -0400 Received: from jacky0da39824a ([71.111.126.38]) by vms048.mailsrvcs.net (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPA id <0J4H00GE4MWMWUS3@vms048.mailsrvcs.net> for lml@lancaironline.net; Thu, 24 Aug 2006 00:50:50 -0500 (CDT) X-Original-Date: Wed, 23 Aug 2006 22:50:32 -0700 From: "Tom Gourley" Subject: Re: [LML] VHF feedback X-Original-To: "Lancair Mailing List" Reply-to: "Tom Gourley" X-Original-Message-id: <003b01c6c741$37354f00$650610ac@jacky0da39824a> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 X-Mailer: Microsoft Outlook Express 6.00.2900.2869 Content-type: multipart/alternative; boundary="----=_NextPart_000_0038_01C6C706.8A3DE080" X-Priority: 3 X-MSMail-priority: Normal References: This is a multi-part message in MIME format. ------=_NextPart_000_0038_01C6C706.8A3DE080 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dom, Do you get a constant frequency squeal, like microphone/speaker = feedback, or does it change pitch with changes in engine RPMs? Tom Gourley ----- Original Message -----=20 From: Dominic V Crain=20 To: Lancair Mailing List=20 Sent: Wednesday, August 23, 2006 12:01 PM Subject: [LML] VHF feedback Any advice on this one. Have a problem with loud squeal on VHF transmission - happens with = both VHF sets, but only from the left side. Right side doesn't happen. Have done all the suggested things from onlookers, cleaning terminals, = etc etc., and it only occurs after engine start. Use Lightspeed ANR 20G headsets. Changed the SPA 400 intercom with another identical unit - no avail. Can't quite recall when it started. Wondered if the installation of = Infinity grips in March might have introduced it with a wiring problem - = this was done by a avionics technician. Switching off the intercom and it goes away. It is quite loud. Any final suggestions? Dom Crain VH-CZJ ------=_NextPart_000_0038_01C6C706.8A3DE080 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Dom,
 
Do you get a constant frequency squeal, = like=20 microphone/speaker feedback, or does it change pitch with changes in = engine=20 RPMs?
 
Tom Gourley
 
----- Original Message -----
From:=20 Dominic V=20 Crain
Sent: Wednesday, August 23, = 2006 12:01=20 PM
Subject: [LML] VHF = feedback

Any advice on this one.

Have a problem with loud squeal on VHF = transmission =96=20 happens with both VHF sets, but only from the left side. Right side = doesn=92t=20 happen.

Have done all the suggested things from = onlookers,=20 cleaning terminals, etc etc., and it only occurs after engine=20 start.

Use Lightspeed ANR 20G = headsets.

Changed the SPA 400 intercom with another = identical=20 unit =96 no avail.

Can=92t quite recall when it started. = Wondered if the=20 installation of Infinity grips in March might have introduced it with = a wiring=20 problem =96 this was done by a avionics technician.

Switching off the intercom and it goes=20 away.

It is quite loud.

Any final suggestions?

Dom Crain

VH-CZJ

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