X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 24 Feb 2011 11:09:33 -0500 Message-ID: X-Original-Return-Path: Received: from hrndva-omtalb.mail.rr.com ([71.74.56.125] verified) by logan.com (CommuniGate Pro SMTP 5.4c2o) with ESMTP id 4880131 for lml@lancaironline.net; Wed, 23 Feb 2011 13:04:20 -0500 Received-SPF: none receiver=logan.com; client-ip=71.74.56.125; envelope-from=Wolfgang@MiCom.net X-Original-Return-Path: X-Authority-Analysis: v=1.1 cv=dquaJDitHqzHCdqWSoZ6IgapSuTzW/4TaRYx9N9k4W8= c=1 sm=0 a=MHZY6FYWMEQOp7S43i2QIw==:17 a=CjxXgO3LAAAA:8 a=Ia-xEzejAAAA:8 a=EncmLGwomg4Rvb8nxf8A:9 a=56YhlCnio7ilPdxaIEQA:7 a=W_ISmFHavoJV5Bt-LIdcfNDu7kAA:4 a=wPNLvfGTeEIA:10 a=rC2wZJ5BpNYA:10 a=EzXvWhQp4_cA:10 a=TfVbgncOYBsmLofqos0A:9 a=oLGN-aafD8Zkdus5jQAA:7 a=jOh0ABhZ_95ij7SuEoS-ErtlEtcA:4 a=MHZY6FYWMEQOp7S43i2QIw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 74.218.201.50 Received: from [74.218.201.50] ([74.218.201.50:2438] helo=Lobo) by hrndva-oedge01.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id AA/84-14011-20C456D4; Wed, 23 Feb 2011 18:03:46 +0000 X-Original-Message-ID: <000901cbd384$00ac3260$6401a8c0@Lobo> From: "Wolfgang" X-Original-To: Subject: Antenna type and placement X-Original-Date: Wed, 23 Feb 2011 13:03:40 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01CBD35A.17A8D8D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01CBD35A.17A8D8D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Your VSWR sounds ok. Where was it measured ? At the radio output or the = antenna input ? Could be a number of causes. Two main areas of investigation ; 1) check the radiated signal with a field strength meter and compare to = another aircraft. 2) check your audio signal and make sure you have full modulation of the = RF signal. Wolfgang From: TOM GARDINER =20 Sender: =20 Subject: Antenna type and placement=20 Date: Wed, 23 Feb 2011 09:09:33 -0500=20 To: lml@lancaironline.net=20 =20 Folks=20 I am experiencing a dreadful time getting my COM radios to = perform to their full (or even half) potential in my LNC2. I have two = Bob Archer's mounted in the tailcone and in the proper orientation with = a VSWR of around 1.5 with RG 400 cable. The antennas are fed by two = Garmin 430s with a measured output of 8 watts each. The thing is that = ATC and my flying friends report a consistently weak signal and the same = applies on reception on my end. My airplane has the carbon tail and I = built the seat bench using carbon on foam (bad idea in hindsight). I = have tried another type of antenna that is a dipole with a balun mounted = in the center of the baggage section in a vertical orientation but with = little or no improvement in results. I am beginning to suspect the Lancair supplied Gray epoxy = primer which I understand contains aluminum oxide in the base I am now considering mounting an external antenna but = thought I would ask if anybody had experienced similar issues and = subsequently corrected them. Any help/advice would be very much = appreciated Thanks Tom LNC2=20 24 hrs=20 =20 ------=_NextPart_000_0006_01CBD35A.17A8D8D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Your VSWR sounds ok. Where was it measured ? At the radio output or = the=20 antenna input ?
 
Could be a number of causes. = Two main areas of investigation ;
 
1) check the radiated signal with a = field strength=20 meter and compare to another aircraft.
 
2) check your audio signal and make = sure you have=20 full modulation of the RF signal.
 
Wolfgang
 
------=_NextPart_000_0006_01CBD35A.17A8D8D0--
lml@lancaironline.net
From: TOM GARDINER=20 <n20087@yahoo.com>
Sender: <marv@lancaironline.net>
Subject: Antenna type and = placement
Date: Wed, 23 Feb 2011 09:09:33 = -0500
To:
Folks
 
I am experiencing a dreadful time getting my COM radios = to=20 perform to their full (or even half) potential in my = LNC2.  I=20 have two Bob Archer's mounted in the tailcone and in the = proper=20 orientation with a VSWR of around 1.5 with RG 400 = cable.  The=20 antennas are fed by two Garmin 430s with a measured = output of 8=20 watts each.  The thing is that ATC and my flying = friends report=20 a consistently weak signal and the same applies on reception = on my=20 end.  My airplane has the carbon tail and I built = the seat=20 bench using carbon on foam (bad idea in hindsight).  I = have=20 tried another type of antenna that is a dipole = with a=20 balun mounted in the  center of the baggage section in = a=20 vertical orientation but with little or no improvement in=20 results.
 
 
I am beginning to suspect the Lancair supplied Gray = epoxy=20 primer which I understand contains aluminum oxide in the = base
 
I am now considering mounting an external antenna but = thought I=20 would ask if anybody had experienced similar issues and = subsequently=20 corrected them.  Any help/advice would be very much=20 appreciated
 
Thanks
 
Tom
 
LNC2
24 hrs