X-Virus-Scanned: clean according to Sophos on Logan.com X-PolluStop: No license found, only first 5 messages were scanned Return-Path: Received: from sccrmhc14.comcast.net ([63.240.77.84] verified) by logan.com (CommuniGate Pro SMTP 5.1c.1) with ESMTP id 1210733 for flyrotary@lancaironline.net; Wed, 28 Jun 2006 18:17:17 -0400 Received-SPF: none receiver=logan.com; client-ip=63.240.77.84; envelope-from=wschertz@comcast.net Received: from 7n7z201 (c-24-7-194-200.hsd1.il.comcast.net[24.7.194.200]) by comcast.net (sccrmhc14) with SMTP id <200606282216300140088cfbe>; Wed, 28 Jun 2006 22:16:30 +0000 Message-ID: <004401c69b00$cc4495f0$c8c20718@7n7z201> From: "Bill Schertz" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Radio noise Date: Wed, 28 Jun 2006 17:18:35 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0041_01C69AD6.E32B6A70" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 This is a multi-part message in MIME format. ------=_NextPart_000_0041_01C69AD6.E32B6A70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable It appears to be the fix, i.e. repositioning the wires. My stack, = working from the bottom up is Transponder, SL-40, SL-30, PMA-6000 audio = panel, and EM-2. The harness from the EM-2 was going across the top of = the audio panel, and raising the wires about an inch or so seems to have = eliminated the problem. Bill Schertz KIS Cruiser # 4045 ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: Wednesday, June 28, 2006 4:02 PM Subject: [FlyRotary] Re: Radio noise Hi Bill, will be very interested in your results. Have had a couple = of other builders mention noise but I have not had any radio noise in my = installation and a hand held turned up none (here) on the problem units = from field. If the wire positioning can make that much difference , = that might explain it. I'll do some more testing here to see if I can = nail this down. Might have something to do with un-terminated inputs as = well since my test bench setup has all inputs wired. Tracy ----- Original Message -----=20 From: Bill Schertz=20 To: Rotary motors in aircraft=20 Sent: Saturday, June 24, 2006 6:58 PM Subject: [FlyRotary] Re: Radio noise After hooking up resistors or sensors to all outputs, I still had = the noise.=20 I then wired in a 100microfarad capacitor on the inlet line between = +12 and=20 GND, and no noticable effect. Further mucking around found that repositioning the wires coming out = of the=20 back of the EM-2 by about 1/2 inch eliminated the noise! Will see if = this=20 'solution' holds up with further tests on Monday. Thanks for all the suggestions. Bill Schertz KIS Cruiser # 4045 ----- Original Message -----=20 From: "Bill Schertz" To: "Rotary motors in aircraft" 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=20 > tomorrow. I note that the sensors are 10 to 180 ohms for temp and=20 > pressure, was there a reason for the suggestion of 20K? > > Thanks. > Bill Schertz > KIS Cruiser # 4045 > ----- Original Message -----=20 > From: "Ed Anderson" > To: "Rotary motors in aircraft" > 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=20 >> generating the nose because some of the pins (tied to the = sensors) are=20 >> not a complete circuit. Might try just hooking up some 20K ohm = resistors=20 >> between your sensor leads and ground just to see. Either that or = perhaps=20 >> getting feed back from the chip on your power lines suggesting a = low=20 >> value .01uf capacitor. >> >> Ed >> ----- Original Message -----=20 >> From: "Bill Schertz" >> To: "Rotary motors in aircraft" >> 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=20 >>>equipment before putting the top on my plane which will make it = much=20 >>>harder to get access. >>> >>> I have an SL-30 NAV/COM and SL-40 COM. The COM works, but when I = turn on=20 >>> the EM-2 I get a bunch of hash (white noise). Any suggestions = on=20 >>> diagonstics? The EM-2 is not connected to 'all' sensors yet. >>> >>> Bill Schertz >>> KIS Cruiser # 4045 >>> >>> -- >>> Homepage: http://www.flyrotary.com/ >>> Archive and UnSub: = http://mail.lancaironline.net/lists/flyrotary/ >>> >> >> >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: = http://mail.lancaironline.net/lists/flyrotary/ > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: = http://mail.lancaironline.net/lists/flyrotary/=20 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_0041_01C69AD6.E32B6A70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
It appears to be the fix, i.e. repositioning the = wires. My=20 stack, working from the bottom up is Transponder, SL-40, SL-30, PMA-6000 = audio=20 panel, and EM-2.  The harness from the EM-2 was going across the = top of the=20 audio panel, and raising the wires about an inch or so seems to have = eliminated=20 the problem.
 
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From:=20 Tracy = Crook
Sent: Wednesday, June 28, 2006 = 4:02=20 PM
Subject: [FlyRotary] Re: Radio=20 noise

Hi Bill, will be very interested in your results.  Have had = a couple=20 of other builders mention noise but I have not had any radio noise in = my=20 installation and a hand held turned up none (here) on the problem = units=20 from field.  If the wire positioning can make that much = difference , that=20 might explain it.  I'll do some more testing here to see if I can = nail=20 this down.  Might have something to do with un-terminated inputs = as well=20 since my test bench setup has all inputs wired.
 
Tracy
----- Original Message -----
From: Bill=20 Schertz
To: Rotary motors in = aircraft=20
Sent: Saturday, June 24, 2006 = 6:58=20 PM
Subject: [FlyRotary] Re: = Radio=20 noise

After hooking up resistors or sensors to all outputs, = I still=20 had the noise.
I then wired in a 100microfarad capacitor on the = inlet=20 line between +12 and
GND, and no noticable = effect.

Further=20 mucking around found that repositioning the wires coming out of the =
back=20 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=20 the suggestions.
Bill Schertz
KIS Cruiser # 4045
----- = Original=20 Message -----
From: "Bill Schertz" <wschertz@comcast.net>
To: = "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent:=20 Friday, June 23, 2006 11:12 PM
Subject: [FlyRotary] Re: Radio=20 noise


> Ed, that is a worthwhile suggestion. I am = going to=20 pick up some resistors
> tomorrow. I note that the sensors = are 10 to=20 180 ohms for temp and
> pressure, was there a reason for the=20 suggestion of 20K?
>
> Thanks.
> Bill = Schertz
> KIS=20 Cruiser # 4045
> ----- Original Message -----
> From: = "Ed=20 Anderson" <eanderson@carolina.rr.com&g= t;
>=20 To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>=20 Sent: Friday, June 23, 2006 9:07 PM
> Subject: [FlyRotary] Re: = Radio=20 noise
>
>
>> Just a WAG, Bill.  Could it = be the=20 oscillator of the microchip in the EM2
>> generating the = nose=20 because some of the pins (tied to the sensors) are
>> not = a=20 complete circuit. Might try just hooking up some 20K ohm resistors=20
>> between your sensor leads and ground just to see.  = Either=20 that or perhaps
>> getting feed back from the chip on your = power=20 lines suggesting a low
>> value .01uf=20 capacitor.
>>
>> Ed
>> ----- Original = Message=20 -----
>> From: "Bill Schertz" <wschertz@comcast.net>
>= >=20 To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>>=20 Sent: Friday, June 23, 2006 6:42 PM
>> Subject: [FlyRotary] = Radio=20 noise
>>
>>
>>>I am in the process of = wiring=20 up and testing each piece of electronic
>>>equipment = before=20 putting the top on my plane which will make it much =
>>>harder=20 to get access.
>>>
>>> I have an SL-30 = NAV/COM and=20 SL-40 COM. The COM works, but when I turn on
>>> the = EM-2 I get=20 a bunch of hash (white noise).  Any suggestions on =
>>>=20 diagonstics? The EM-2 is not connected to 'all' sensors=20 yet.
>>>
>>> Bill Schertz
>>> = KIS=20 Cruiser # 4045
>>>
>>> --
>>>=20 Homepage:  http://www.flyrotary.com/
>&= gt;>=20 Archive and UnSub:   http://mail.lanca= ironline.net/lists/flyrotary/
>>>
>>
>>=
>>
>>=20 --
>> Homepage:  http://www.flyrotary.com/
>&= gt;=20 Archive and UnSub:   http://mail.lanca= ironline.net/lists/flyrotary/
>
>
>=20 --
> Homepage:  http://www.flyrotary.com/
> = Archive and UnSub:   http://mail.lanca= ironline.net/lists/flyrotary/=20


--
Homepage:  http://www.flyrotary.com/
Archi= ve=20 and UnSub:   http://mail.lanca= ironline.net/lists/flyrotary/
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