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Radar dome GPS antenna distance w/pics

Old 04-14-2007, 06:47 PM
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Default Radar dome GPS antenna distance w/pics

Guys,

I read the previous thread regarding the Radar dome killing the GPS antenna. Here are a few pics of my installation this past winter.

The GPS does NOT loose the satellites when the radar is initialized. Is the alignment still too close ?






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Old 04-14-2007, 06:49 PM
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Default Re: Radar dome GPS antenna distance w/pics

it will be fine right where you have it
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Old 04-14-2007, 07:14 PM
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Default Re: Radar dome GPS antenna distance w/pics

I agree - looks like enuf to me ...
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Old 04-14-2007, 07:33 PM
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Default RE: Radar dome GPS antenna distance w/pics

both my GPS antenna's are about the same
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Old 04-14-2007, 08:03 PM
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Default RE: Radar dome GPS antenna distance w/pics

Thanks !

I wasn't sure how narrow the RF pattern is when it leaves the dome.

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Old 04-14-2007, 08:25 PM
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Default Re: Radar dome GPS antenna distance w/pics

What bracket do you have between the dome and the canvas?.

La Luz
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Old 04-14-2007, 08:40 PM
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here's the best way I found to get the gps mushrooms down on the deck. This is a short nylon shakespere mount unlike the stainless above. It has threads to the base. Since the 'shroom antenna threads all the way down, there is no need for stainless. Be sure to get the wedges made by shakespere to straighten the shroom vertically so it does not tilt outward due to the bow in the t-top:


A seaview 5 inch strut (seen behind) puts any dome high enuf above to eliminate any interferece problems between antennas and domes...
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Old 04-14-2007, 08:49 PM
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Default Re: Radar dome GPS antenna distance w/pics

It looks fine to me, as a test. Start up the GPS without the radar on - several times, get the average time it takes to aquire a fix. No do the same thing, but with the radar tx first. Is the average time the saem or longer. This is not a definitive test, but could help with your piece of mind, If the times are the same, I would say you are not being interfered with.
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Old 04-14-2007, 11:16 PM
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Default RE: Radar dome GPS antenna distance w/pics

BW23 - 4/14/2007 6:47 PM

Guys,

I read the previous thread regarding the Radar dome killing the GPS antenna. Here are a few pics of my installation this past winter.
From the picture above we can figure out - you have 2.2kW 18" radome, right? If this is true, your vertical beamwidth
(angular spread of the beam) is 25°.

The following may enhance your hockey stick experiment, enjoy:

Please note, this is just an approximation. In real life radar beam never looks as simple and nice.





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Old 04-15-2007, 12:10 AM
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Default Re: Radar dome GPS antenna distance w/pics

Looks like a lot of us did things the same way. No issues with my setup...works perfectly. On a side note, I may remove the 1/2" starboard wedge I made for the wedge.




--JK
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Old 04-15-2007, 12:25 AM
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La Luz - 4/14/2007 7:25 PM

What bracket do you have between the dome and the canvas?.

La Luz
I fabricated it myself. Here is a thread with pics.

http://www.thehulltruth.com/forums/t...ts=19#M1406828
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Old 04-15-2007, 01:12 AM
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Default Re: Radar dome GPS antenna distance w/pics

Looks okay to me, but you'd better tape that hockey stick down or you're going to lose it out on the water...
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Old 04-15-2007, 02:10 AM
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BW23 - 4/15/2007 2:47 PM

Guys,

...Is the alignment still too close ?
I think so. At a minimum I would get it off that chrome looking stump thing, get it down lower like Glen did. OTOH, it's a Garmin product so it's disposable anyway.

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Old 04-15-2007, 10:28 AM
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Default Re: Radar dome GPS antenna distance w/pics

If it was me that is too close for comfort and would drop the antenna down more. You are going to catch some of that beam believe me.
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Old 04-15-2007, 11:40 AM
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swamppro - 4/15/2007 9:28 AM

If it was me that is too close for comfort and would drop the antenna down more. You are going to catch some of that beam believe me.
I'm dreading doing that as I'll have to pull the antenna wire back thru the top tubing.

The boat came eqipped with the current mount.
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Old 04-15-2007, 11:45 AM
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BW23 - 4/15/2007 11:40 AM

swamppro - 4/15/2007 9:28 AM

If it was me that is too close for comfort and would drop the antenna down more. You are going to catch some of that beam believe me.
I'm dreading doing that as I'll have to pull the antenna wire back thru the top tubing.

The boat came eqipped with the current mount.
I remember when you made that radar mount - nice job - raise the dome again by cutting 4 - 1/2" squares of white starboard and sand the edges so it all looks like one piece - insert and you're done...
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Old 04-15-2007, 12:04 PM
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Default RE: Radar dome GPS antenna distance w/pics

good_enough - 4/14/2007 10:16 PM
BW23 - 4/14/2007 6:47 PM Guys, I read the previous thread regarding the Radar dome killing the GPS antenna. Here are a few pics of my installation this past winter.
From the picture above we can figure out - you have 2.2kW 18" radome, right? If this is true, your vertical beamwidth (angular spread of the beam) is 25°. The following may enhance your hockey stick experiment, enjoy: Please note, this is just an approximation. In real life radar beam never looks as simple and nice.
Can someone clarify the 'verticle beamwidth'? I've only heard the horizontal referred to. 25 degrees seems high. The horizontal for the 18" is 5.2 degrees.
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Old 04-15-2007, 01:35 PM
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Default RE: Radar dome GPS antenna distance w/pics

i think you have the gps right inside the radar beam, which is a no no based on the electronics installation recommendations i have seen in boat us and on the consumers marine websites. mine is located well under the beam, but closer to the dome. i have not experienced any problems.

looking at your setup, the recommendations would suggest a small mast to get the gps on top of the beam. you can check out the websites for your own opinion. hope it helps. ron
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