X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from elasmtp-galgo.atl.sa.earthlink.net ([209.86.89.61] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6092471 for lml@lancaironline.net; Sat, 02 Mar 2013 15:38:21 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.61; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=jEisHjkwqt7XD4Pb96MRTmOMUEY/TIR7937+pWf5tkIaRV0vrJqHA3lfrc8A+FsT; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [37.142.115.202] (helo=[192.168.1.22]) by elasmtp-galgo.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1UBtBi-0008Cx-RO for lml@lancaironline.net; Sat, 02 Mar 2013 15:37:47 -0500 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-801--450107820 Subject: Re: [LML] Looking for advise on Antenna locations for IVP Date: Sat, 2 Mar 2013 15:37:44 -0500 In-Reply-To: To: "Lancair Mailing List" References: Message-Id: <6C99CA7A-B95F-45CC-8CC1-993B644B3FCB@earthlink.net> X-Mailer: Apple Mail (2.1085) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da94044e3f9a2aab2779dab667111909c6c54350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 37.142.115.202 --Apple-Mail-801--450107820 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi Tom, my conclusion on the Bob Archer in the tail is that under the very best = conditions it will work sort of okay to the left and right and not work = straight ahead. Long as you aren't talking to anyone at your = destination this should not be a problem. ;-> The very best location on a IV for a com antenna is indeed just ahead of = the gear. I don't know why you are disqualifying that area because of = the fuel tank. You can use copper tape in the shape of an asterisk, = applied to the outside, as the ground plane. If you have to run on the = coax on the outside til you get to the back of the tank you could fair = it well enough. Next best place is a little back from the front of = the gear wells. I don't have any direct experience with the marker beacon but I've heard = of a lot of people doing that. What was your plan for nav antennas? Colyn On Mar 2, 2013, at 2:51 PM, Tom & Beth Sullivan wrote: =20 I did a search on the LML archives and found a pot pouri of = questions, problems and tips, but much of the info had to do with glass = planes (not carbon fiber), and I have some unique challenges as well. =20 I have already installed the Bob Archer com antenna in the vert/stab = and a nav antenna in the winglet (think just one). My unique challenge = is the fact that most of my belly between the gear and forward to the = firewall is fuel tank, so this area is unusable for antennas. I think, = based on complaints, that I want at least one more com antenna. As = shown in the attached picture, of the aft fuselage area with my A/C, = there is no way I can get a large ground plane in there. With carbon, = do they usually install it in the fuselage (wondering if the ground = plane does any good behind the carbon)? I may be able to get a = "segmented" one in there, with part of the ground plane inside the A/C = condenser box, and run a ground strap or strip between the segments at = each end of the "pie slice" cut out for the A/C. Otherwise I am limited = to a smaller ground plane, or installing one on the outside of the skin = (already body worked and in primer).=20 =20 Also, for the transponder and Marker beacon antennas, wondering if I = could place one at the rear of each wing fairing, as I think the ground = plane (G/P) on those would be smaller, and the G/P could be "seen" = easily through the fiberglass of those fairings. My understanding is = the gound plane need only be as large in radius as the length of the = actual antenna it is connected to? =20 Thanks in advance for any advice. =20 Tom Sullivan =20 =20 -- For archives and unsub = http://mail.lancaironline.net:81/lists/lml/List.html --Apple-Mail-801--450107820 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Hi Tom,

my conclusion on the Bob = Archer in the tail is that under the very best conditions it will work = sort of okay to the left and right and not work straight ahead.   =  Long as you aren't talking to anyone at your destination this = should not be a problem. ;->

The very best = location on a IV for a com antenna is indeed just ahead of the gear. =   I don't know why you are disqualifying that area because of the = fuel tank.  You can use copper tape in the shape of an asterisk, = applied to the outside, as the ground plane.   If you have to run = on the coax on the outside til you get to the back of the tank you could = fair it well enough.      Next best place is a little = back from the front of the gear wells.

I don't = have any direct experience with the marker beacon but I've heard of a = lot of people doing that.

What was your plan = for nav = antennas?

Colyn

On Mar = 2, 2013, at 2:51 PM, Tom & Beth Sullivan wrote:

 
   I did a search on the LML archives and found = a pot pouri of questions, problems and tips, but much of the info had to = do with glass planes (not carbon fiber), and I have some unique = challenges as well.
 
   I have already installed the Bob Archer com = antenna in the vert/stab and a nav antenna in the winglet (think just = one).  My unique challenge is the fact that most of my = belly between the gear and forward to the firewall is fuel tank, so this = area is unusable for antennas.  I think, based on complaints, that = I want at least one more com antenna.  As shown in the attached = picture, of the aft fuselage area with my A/C, there is no way I can get = a large ground plane in there.  With carbon, do they usually = install it in the fuselage (wondering if the ground plane does any good = behind the carbon)?  I may be able to get a "segmented" one in = there, with part of the ground plane inside the A/C condenser box, and = run a ground strap or strip between the segments at each end of the = "pie slice" cut out for the A/C.  Otherwise I am limited to a = smaller ground plane, or installing one on the outside of the skin = (already body worked and in primer). 
 
  Also, for the transponder and Marker beacon = antennas, wondering if I could place one at the rear of each = wing fairing, as I think the ground plane (G/P) on those would be = smaller, and the G/P could be "seen"  easily through the fiberglass = of those fairings.  My understanding is the gound plane need only = be as large in radius as the length of the actual antenna it is = connected to?
 
Thanks in advance for any advice.
 
Tom Sullivan
 
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