Mailing List lml@lancaironline.net Message #67222
From: Colyn Case <colyncase@earthlink.net>
Subject: Re: [LML] Re: WX 500 Stormscope False Strikes
Date: Mon, 30 Sep 2013 19:00:40 -0400
To: Lancair Mailing List <lml@lancaironline.net>
There are limited location options on a IV-P.

Question for the A/P gurus: 
 Do these stepper motors make electrical noise when they are holding a position or only when they are moving?

The stormscope has an inhibit line.   I have mine wired so that the inhibit is on whenever the hydraulic pump is on.  (actually when it's on and a few milliseconds afterward)  I wonder if it's practical to develop an inhibit signal for the a/p servo which has a low duty cycle.

On Sep 30, 2013, at 12:58 PM, Mike Larkin wrote:

I use to install WX500's and the like when I worked at the Avionics shop up in Albany NY years ago.  The Storm Scope system has a very sensitive antenna.  Many items interfere with this system.  The company has a tool that maps the best location for there antenna.  One of you local shops may have a mapper.  You many have to lease a loaner or go to a service center.  If you are looking to do it on the cheep, move the antenna as far away from any motors, output antennas, and hi voltage(strobe lights) items as you can.  Try to copy someone that has had success with the same setup including AP servo locations.

Mike Larkin


On Sun, Sep 29, 2013 at 7:53 PM, Craig Berland <cberland@systems3.net> wrote:
I have a WX 500 Stormscope installed in my IV-P.  With the autopilot turned off it works perfectly but with the autopilot on, it lights up with false strikes.  I suspect the AP servo motor near the WX 500 antenna is the culprit. Do you antenna/electronics experts believe I would be successful shielding the antenna with lead foil either at the antenna or at the servo motor?
Craig Berland
N7VG

Sent from my iPad



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Mike Larkin
LarkinAviationConsulting
LegacyL2K@gmail.com
602-770-6054

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