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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 -----
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 -----
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.
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
>>>
>>> --
>>>
Homepage: http://www.flyrotary.com/
>>>
Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
>>>
>>
>>
>>
>>
--
>> Homepage: http://www.flyrotary.com/
>>
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>
>
>
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