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Will Older Radar Damage New GPS Antenna??

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Will Older Radar Damage New GPS Antenna??

Old 10-01-2006, 06:29 PM
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Default Will Older Radar Damage New GPS Antenna??

Im considering whether or not to update the GPS/Fishfinder in my boat. I have an older Raytheon radar that works fine and I intend to keep it. Here's the question. Will my radar antenna interfere or cause damage to a new GPS antenna? Im considering the lowrance 332C. My current electronics are Raytheon and were installed in 1991. My GPS works most of the time but shuts off from time to time...Thanks.
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Old 10-01-2006, 06:38 PM
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Default Re: Will Older Radar Damage New GPS Antenna??

I dont think the age of the RADAR has anything to do with it. It seems like some GPS antennae are more sensitive than others. I never had a problem with my Northstar or Furuno antennae, but I know of several Lowrance and Raymarine GPS antennae that got toasted from the RADAR.
Old 10-01-2006, 09:08 PM
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Default Re: Will Older Radar Damage New GPS Antenna??

You don't want any GPS antenna in the beam of the radar--the horizontal beam is 25 to 35 degrees, If you can keep the GPS above or below that (I choose below)--then you should be fine. Figure if you are 20 degrees ( mine are more than 30 degrees below) above or below the horizontal (or the plane of the radar's center of radiation) you should be OK.
Old 10-01-2006, 09:48 PM
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Default RE: Will Older Radar Damage New GPS Antenna??

Thanks for the replies... My Radar antenna sits forward of my GPS antenna, and on top of a square looking base. My GPS antenna has a 6" support pole that holds it above the hard top (they actually look like they are inline with each other)....
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Old 10-06-2006, 08:29 PM
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Default Re: Will Older Radar Damage New GPS Antenna??

A place that has proven GREAT to mount a GPS antenna, which puts it completely out of harm's way is on your dashboard, as far forward as possible, without actually touching the glass. Keeps it out from under the top, and out of the weather, and it works flawlessly there!

Have recommended this location to many people, and have rigged them this way for others, and nothing but praise and success.

Just an option to consider.

-TH
Old 10-06-2006, 09:21 PM
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Default Re: Will Older Radar Damage New GPS Antenna??

My Garmin GPS antenna is on the same plane as my Furuno radar, and no performance issues are seen with either unit. I asked Garmin tech support if having them on the same plane could cause a problem, and they said they had never known of it happening.
Old 10-07-2006, 07:11 AM
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Default Re: Will Older Radar Damage New GPS Antenna??

a Raymarine radar WILL blow out a lowrance gps antenna everytime ( if in the beam ). supposively a lowrance tech said the brand new models wont because the antennas are now all shielded.
Old 10-23-2006, 03:49 PM
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Default Re: Will Older Radar Damage New GPS Antenna??

The first time I installed a Lowrance about 2 years ago, ANY radar, even from passing working vessels would toast it. Went through 5 antennas and cable. Lowrance finally gave me my money back. Some love Lowrance but man o man was I pissed about that and would never buy their GPS products for use in a radar environment again (I had a garmin running at the same time and it was impervious to the radar).
Old 10-23-2006, 10:19 PM
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Default Re: Will Older Radar Damage New GPS Antenna??

Radar is a spinning microwave oven. It will cook a GPS antenna. Garmin experience antenna failures that baffled their engineers until (I believe) Simrad stated experiencing the same thing with their GPS antennas getting fried and Simrad figured it out. At the time (years ago) Garmin did not have the radar experience they have today.

Keep your GPS antenna above or below your radar’s beam.


Edit: there are websites with plans on how to take apart a microwave oven, focus the output thru a horn and point it at your neighbor’s house. It will kill their house plants, cause your neighbor to develop cataracts in his/her eyes, and eventually lead to brain cancer.

You might what to stay out of your radar’s beam, too.
Old 10-24-2006, 10:08 AM
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Default Re: Will Older Radar Damage New GPS Antenna??

I had a Garmin 2010C with the antenna mounted on the same plane as a Furuno 2.2 KW radar. While the radar did not cook the antenna, the GPS could not acquire the satellite signals while the radar was operating. This was in 2002, and I called Garmin--they said they were aware of the problem. There was even a question posted on their website asking about it, so I know they were aware that a problem existed. Supposedly, the antennas were hardened and the literature on the installation guide reads to locate the antenna above or below any radar source. It's an easy enough fix....put the antenna on a stand-off to get it well above.....problem solved.

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