REFLECTOR: i pad / radio noise

[Brian Michalk]

There may be something wrong with your nav antenna.  Do you have two nav 
antennas?  Try swapping them out, or make a temporary one and see if 
that works from inside the fuselage.

The filter you are suggesting is to smooth out power surges/spikes, and 
is a different animal than RF, capacitive or inductive interference.
Try to borrow an oscilloscope.  They are very illuminating.  Put it on 
your mains bus, and turn loads on and off to see which is possibly 
making power surges.  You might be surprised at how some small relays 
throw spikes into your power lines.

When you find a noisy load, troubleshoot that one only until it's nice 
and quiet.  Then repeat again.  It will usually reveal a bad crimp, 
ground loops or other things that will eventually bite you anyway.

On 9/16/2013 12:58 PM, John Dibble wrote:
> Thanks, everyone for your comments.  Here is where I'm at.  The 
> ferrite choke collar doesn't help.  I tried another adapter and that 
> eliminated the radio noise, but the nav problem remains.  A mooney 
> stopped at our airport yesterday and he's using an adapter and claims 
> no problems.  I looked at it and tried to get the same one at 
> Walmart.  Flying in one direction, parallel to a VOR, it didn't seem 
> to help, but when I turned 180 degrees, the nav seemed to be working 
> correctly.  I'll get the exact model the next time this guy stops by.
>
> I want to put a filter on my alternator.  A Cessna filter was 
> recommended.  I understand it's a capacitor with a resistor.  Can I 
> make one?
>
> Can I put one on my EI as well?  I get a little noise from both the 
> alternator and EI.
>
> John
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