X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from elasmtp-dupuy.atl.sa.earthlink.net ([209.86.89.62] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTP id 7131817 for lml@lancaironline.net; Fri, 05 Sep 2014 21:57:11 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.62; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=kHleYxZ9Ik1a+g5FrrF+YjT0Z6osC4mhn0jyOYqBhl83n8tHnHX9cvqIvsLNDR6p; 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 [64.223.160.208] (helo=[192.168.1.24]) by elasmtp-dupuy.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1XQ5Eq-0004LW-5G for lml@lancaironline.net; Fri, 05 Sep 2014 21:56:28 -0400 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-87-17174423 Subject: Re: [LML] Re: Right Fuel Tank Probe Date: Fri, 5 Sep 2014 21:56:27 -0400 In-Reply-To: To: "Lancair Mailing List" References: Message-Id: <8E5995E2-136D-4380-93D5-23B4BB3AF2B8@earthlink.net> X-Mailer: Apple Mail (2.1085) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940fbf6276e38d0c249f3a08f1bbf91ded8350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 64.223.160.208 --Apple-Mail-87-17174423 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 I don't know how the gea71 is put together but on some engine monitors = the a2d circuits are not super well isolated from each other. ...so = that if you have a short to ground on an adjacent channel you get weird = results on other channels. Also, if the gea71 is doing the frequency = to voltage conversion, then you have the wires all the way from the = probe to the gea71 subject to RF interference. It's possible neither of those are your problem but just sayin.... On Sep 5, 2014, at 1:15 PM, pete@leapfrogventures.com wrote: Alan, =20 The fuel probe wires go directly into the G900 GEA71 module (connector = P702). The G900 does the conversion that other use the Princeton box = for. The left probe goes into pins 15 (white), 32 (blue), 75 (orange). = The right probe goes into 15 (white), 12 (blue), and 74 (orange). =20 I also have intermittent failures on my left probe. Haven=92t hunted = down the problem yet, because it only happens every few hours for a few = seconds at a time, so it is hard to duplicate. I did have an entire = flight where it went dead, but it immediately started working again on = its own on the next flight. I have thought of switching the probe wires = as they go into the G900 to determine if the problem is inside the GEA71 = vs in the probe or the wiring, but that is a painful rewire to = accomplish in my setup. =20 Pete =20 From: Colyn Case [mailto:colyncase@earthlink.net]=20 Sent: Thursday, September 04, 2014 1:24 PM Subject: Re: [LML] Right Fuel Tank Probe =20 Alan, =20 not sure how everybody else does it but mine comes in with the rest of = wire bundle from the wing and has a 10-point princeton converter right = there. I had flakiness like that which had to do with actually the old = converter. When I put the new ones in, the problem disappeared. I'm = not sure what your setup is but chances are the garmin 900 only = understands a voltage value which means you have to have a converter in = there somewhere. (converting frequency to 0-5V). =20 =20 Colyn =20 On Sep 3, 2014, at 11:52 AM, Alan Crawford wrote: =20 Need help ... Right fuel tank gauge is intermittent ... Where does the = wiring come from the fuel tank probe to the Garmin 900 display? ... = Looking for a loose connection! =20 House is being remodeled and can't find my books or notes in storage? Blue Skies Alan Flown to you by Race 21 via EFB Life is NOT a Journey to the grave with the Intention of arriving safely = In a Pretty and Well Preserved Body, BUT rather to skid in = broadside,Thoroughly used up, Totally Worn Out, and Proclaiming ..... = =93WOW, WHAT A RIDE!!!=94 =20 --Apple-Mail-87-17174423 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 I don't know how the gea71 is put together but on = some engine monitors the a2d circuits are not super well isolated from = each other.    ...so that if you have a short to ground on an = adjacent channel you get weird results on other channels.   Also, = if the gea71 is doing the frequency to voltage conversion, then you have = the wires all the way from the probe to the gea71 subject to RF = interference.

It's possible neither of those are your = problem but just sayin....

On Sep 5, 2014, at = 1:15 PM, pete@leapfrogventures.com = wrote:

The fuel = probe wires go directly into the G900 GEA71 module (connector = P702).  The G900 does the conversion that other use the Princeton = box for.  The left probe goes into pins 15 (white), 32 (blue), 75 = (orange).  The right probe goes into 15 (white), 12 (blue), and 74 = (orange).
I also have = intermittent failures on my left probe.  Haven=92t hunted down the = problem yet, because it only happens every few hours for a few seconds = at a time, so it is hard to duplicate.  I did have an entire flight = where it went dead, but it immediately started working again on its own = on the next flight.  I have thought of switching the probe wires as = they go into the G900 to determine if the problem is inside the GEA71 vs = in the probe or the wiring, but that is a painful rewire to accomplish = in my setup.
From: Colyn = Case [mailto:colyncase@earthlink.net] 
Sent: Thursday, September 04, = 2014 1:24 PM
 Re: [LML] Right Fuel Tank = Probe
not sure how everybody else does it but mine = comes in with the rest of wire bundle from the wing and has a 10-point = princeton converter right there.   I had flakiness like that which = had to do with actually the old converter.  When I put the new ones = in, the problem disappeared.  I'm not sure what your setup is but = chances are the garmin 900 only understands a voltage value which means = you have to have a converter in there somewhere.  (converting = frequency to 0-5V).   =  
On Sep 3, = 2014, at 11:52 AM, Alan Crawford = wrote:
Need help = ... Right fuel tank gauge is intermittent ... Where does the wiring come = from the fuel tank probe to the Garmin 900 display? ... Looking for a = loose connection!
House is being remodeled and can't find my = books or notes in storage?

          =   Blue Skies
            =     Alan
Flown to you by Race 21 via = EFB
Life is NOT = a Journey to the grave with the Intention of arriving = safely In a Pretty and Well Preserved Body, BUT = rather to skid in broadside,Thoroughly used up, Totally Worn Out, and = Proclaiming ..... =93WOW, WHAT A = RIDE!!!=94