Mailing List flyrotary@lancaironline.net Message #32410
From: Bill Schertz <wschertz@comcast.net>
Subject: Re: [FlyRotary] Re: Radio noise
Date: Sat, 24 Jun 2006 17:58:12 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
After hooking up resistors or sensors to all outputs, I still had the noise. I then wired in a 100microfarad capacitor on the inlet line between +12 and GND, and no noticable effect.

Further mucking around found that repositioning the wires coming out of the back of the EM-2 by about 1/2 inch eliminated the noise! Will see if this 'solution' holds up with further tests on Monday.

Thanks for all the suggestions.
Bill Schertz
KIS Cruiser # 4045
----- Original Message ----- From: "Bill Schertz" <wschertz@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, June 23, 2006 11:12 PM
Subject: [FlyRotary] Re: Radio noise


Ed, that is a worthwhile suggestion. I am going to pick up some resistors tomorrow. I note that the sensors are 10 to 180 ohms for temp and pressure, was there a reason for the suggestion of 20K?

Thanks.
Bill Schertz
KIS Cruiser # 4045
----- Original Message ----- From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, June 23, 2006 9:07 PM
Subject: [FlyRotary] Re: Radio noise


Just a WAG, Bill.  Could it be the oscillator of the microchip in the EM2 generating the nose because some of the pins (tied to the sensors) are not a complete circuit. Might try just hooking up some 20K ohm resistors between your sensor leads and ground just to see.  Either that or perhaps getting feed back from the chip on your power lines suggesting a low value .01uf capacitor.

Ed
----- Original Message ----- From: "Bill Schertz" <wschertz@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, June 23, 2006 6:42 PM
Subject: [FlyRotary] Radio noise


I am in the process of wiring up and testing each piece of electronic equipment before putting the top on my plane which will make it much harder to get access.

I have an SL-30 NAV/COM and SL-40 COM. The COM works, but when I turn on the EM-2 I get a bunch of hash (white noise).  Any suggestions on diagonstics? The EM-2 is not connected to 'all' sensors yet.

Bill Schertz
KIS Cruiser # 4045

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