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Date: Fri, 02 Apr 2010 14:06:28 -0400
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From: Barney Britton <bbriton@telus.net>
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Subject: Re: [LML] GPS reception issue
References: <list-4193219@logan.com>

Kieth

Do you have any tinting film on your canopy?  The gold film that some  
people use to keep out the heat of the sun also filters GPS signals.

Just a thought

Barney Britton

Sent from my iPhone

On Apr 2, 2010, at 6:35 AM, Keith Smith <keith.smith@gmail.com> wrote:

> The signal reception on my Garmin 420 is really dodgy.  We've tested  
> the unit on a bench and it worked great.  We've swapped the antenna,  
> no change. We swapped the antenna cable, it actually got quite a bit  
> worse (the old one had intermittent issues, the new one is dodgy,  
> nearly full time.)
>
> If I route the cable 'just so', I can make it work fairly well on  
> the ground with the canopy open, but it tends to go to hell when I  
> close the canopy.
>
> If I unscrew and lift the glare shield about 1/2" - 1", the  
> reception is great.  The GPS antenna is attached to the top of the  
> glare shield on the co-pilot side.
>
> I'm going to get some help from a shop in debugging this...but it  
> seems to me that part of the canopy is either causing interference  
> within the antenna cable, or the antenna itself.
>
> Has anyone experienced anything like this before? This is in a 360.
>
> Keith