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Radar impedeing gps?

Old 01-28-2007, 07:00 AM
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Default Radar impedeing gps?

I have a Garminn 3210 with the 4kw radardome. When I start the unit, 9 times out of 10 the GPS will not respond. I have the GPS antenna mounted on a extension 2'+/- above radar. I have to turn on and off repeatedly to get it to respond. But once on it works all day. Is this the radar affecting it? If not, anyone have any ideas? thanks.
Old 01-28-2007, 07:24 AM
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gsniffen
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Default Re: Radar impedeing gps?

It shouldn't be a radar issue if it's not in the radar beam. Are there any other antennas mounted near the GPS antenna?
Garmin GPS machines go through a startup routine where the software initializes and maps are loaaded and, following that, they display an agreement acceptance where you have to "enter" to acknowledge. Is it going through that?
What happens with the radar disconnected?
Old 01-28-2007, 07:27 AM
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Default Re: Radar impedeing gps?

Could it be low voltage to the GPS when the radar powers uP?
Old 01-28-2007, 07:30 AM
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Default Re: Radar impedeing gps?

Had a similar issue with my CP1000 and Furuno radar. The mfg (SH) sent me a new gps antenna with a filter installed no charge. They somewhere along the line made a revision because of issues like this.
Old 01-28-2007, 03:06 PM
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Default Re: Radar impedeing gps?

gsniffen - 1/28/2007 7:24 AM

It shouldn't be a radar issue if it's not in the radar beam. Are there any other antennas mounted near the GPS antenna?
Garmin GPS machines go through a startup routine where the software initializes and maps are loaaded and, following that, they display an agreement acceptance where you have to "enter" to acknowledge. Is it going through that?
What happens with the radar disconnected?
It goes through the procedure described, but skips the GPS sometimes. It acts weird. Is there are hard reset to get back to default settings?Never tried it with the radar disconnected.
Old 01-31-2007, 10:21 PM
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Default Re: Radar impedeing gps?

I have a Garmin 2006c and a 4 kw JRC radar. I had to mount my GPS antenna 4.5 ft. above the hard top to get it out of the radar beam. I never heard of anyone else having to mount the antenna that high, maybe you need to raise it. I would talk to Garmin. 800-800-1020

I just updated my software because I was getting error messages on the chartplotter that said the unit couldn't read the position from the antenna. Garmin sent me the data card update and it seems to have cleared up the problem. A software update might help.
Old 02-01-2007, 06:57 AM
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Default RE: Radar impedeing gps?

SD,
I don't think it is your radar causing the problem. I have 2 gps units. One has the antenna mounted under the the radar antenna sweep and the other uses the internal antenna on the unit that is mounted on the console under the hardtop. Neither unit has a signal problem. I would call Garmin tech support like was previously suggested.
Old 02-01-2007, 08:08 AM
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Default RE: Radar impedeing gps?

My GPS antenna was charcoaled by the radar beams. I had to replace it with a new one with better shield. I installed the new one a foot under the radar, so far no problem. Please remember even 5 degrees of angle on the mounted radar will make a lot of difference in the beams direction.
Old 02-01-2007, 10:09 AM
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Default Re: Radar impedeing gps?

My personal preference is to put the radar up on a strut and the other antennas right on the deck - going on 2 years with no problems...keeping them low is more stuff that does not require poles waving around and the CG lower. I think it looks better, too. Also, I 'm sure things "fry" quicker using a 4 Kw vs a 2 Kw.....
Old 02-01-2007, 04:58 PM
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Default Re: Radar impedeing gps?

I think Glen is right about the looks. Another problem with the antenna being up so high is the pendulum effect. As the boat rocks, the map shifts back and forth if the display is set to "course up". For those two reasons I am considering lowering my antenna to a position on the dash up close to the windshield.

If raising your antenna is not an option, maybe lowering it would help.
Old 02-02-2007, 09:38 AM
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Default Re: Radar impedeing gps?

Because it's easy... Remove the antenna and any cable in the radar path. Test it with the antenna under the beam.

This way you can advise the factory that you tried relocating it if ti doesnt work. Good luck!

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