Ever cut the antena down - BMW Luxury Touring Community
 
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post #1 of 17 Old Oct 27th, 2008, 5:35 pm Thread Starter
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Ever cut the antena down

I would like to cut the antenna down to the top of the rack. I use a half cover every day at work which would fit better. Also my heated room in my garage has only a 8' ceiling so I have to remove the antenna each time I use my lift.
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post #2 of 17 Old Oct 27th, 2008, 5:43 pm
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Re: Ever cut the antena down

If your bike has a luggage rack just "bend" it under the rail away from the antenna side. It is what I do to cover mine and work on the lift.

The dealers will do that too as on and off is hard on them and you will eventually break the mating points.

Lee
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post #3 of 17 Old Oct 27th, 2008, 6:38 pm
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Re: Ever cut the antena down

I lopped about 12" off mine the day I brought it home 5 years ago. I have never missed it and the radio reception is just fine.

Go for it....

Gene Sweeney

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post #4 of 17 Old Oct 27th, 2008, 8:45 pm
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Re: Ever cut the antena down

Quote:
Originally Posted by emsweeney
I lopped about 12" off mine the day I brought it home 5 years ago. I have never missed it and the radio reception is just fine.

Go for it....
It won't be noticeable with nearby powerful stations, but it will definitely make reception much worse if you live out in the boonies like me.

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post #5 of 17 Old Oct 27th, 2008, 9:00 pm
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Re: Ever cut the antena down

Quote:
Originally Posted by saddle-man
I would like to cut the antenna down to the top of the rack. I use a half cover every day at work which would fit better. Also my heated room in my garage has only a 8' ceiling so I have to remove the antenna each time I use my lift.
Hey, Dave - ping Grif (grifscoots). He used a shorty antenna (I believe from RatShack) on his LT forever, so it must have worked fine. It didn't extend much above the top trunk, IIRC.
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post #6 of 17 Old Oct 27th, 2008, 11:12 pm
 
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Re: Ever cut the antenna down

Yes, I cut mine down. I HATED that long stupid thing! But yes, I did lose reception as well. Eventually, I removed it altogether and put a powered hide-away antenna under the topbox. FM worked good, but AM was noisy. Argh...

I never understood why BMW didn't put a collapsible antenna on the LT.
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post #7 of 17 Old Oct 28th, 2008, 1:09 pm
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Re: Ever cut the antena down

I just take mine off when riding to work and use the cover. It has never been a reception problem with the antenna removed. And whenever the wife and I go for a long ride I just put it back on. It only take a few seconds to either remove or install it.

Manny
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post #8 of 17 Old Oct 28th, 2008, 10:36 pm
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Re: Ever cut the antena down

I didn't want to lose any radio reception, so I cut a small hole in the cover for the ant to poke through. Then I got a grommet kit from the camping store to re-enforce the material around the hole. Has worked great over a year so far.

Steve
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post #9 of 17 Old Oct 29th, 2008, 7:23 am
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Re: Ever cut the antena down

I ordered this one from Crutchfield, and replaced the whole thing. I made a bracket to mount it in the original position. It is short, reception is great. Bike cover is alot easier to put on too.

http://www.crutchfield.com/App/Produ...ntenna&tp=1106

Jim G - Rochester, MN
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post #10 of 17 Old Oct 29th, 2008, 7:59 am
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Wink Re: Ever cut the antena down

All this talk of Bike Covers GEEEZZZZ you guys sound like Wing riders.

Howard Dusenbery 2000 K1200LTC
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post #11 of 17 Old Oct 29th, 2008, 8:14 am
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Re: Ever cut the antena down

Quote:
Originally Posted by jaskjb
I ordered this one from Crutchfield, and replaced the whole thing. I made a bracket to mount it in the original position. It is short, reception is great. Bike cover is alot easier to put on too.

http://www.crutchfield.com/App/Produ...ntenna&tp=1106
Hi, Jim - mornin' to ya. Got a favor to ask. If you ever get the chance to take a pic of your install of this antenna, could you post it here?? I've gotta a minds-eye picture of how it looks installed, as compared to the OEM unit (which isn't attractive at all ), butt would like to see a pic or two. And wuz the installation uncomplicated? The bracket you made - how'd that work? Used any part of the OEM stuff?

Thanks in advance, Jim. Great info to have here for the community. And btw - that price is outstanding!! How they do that?!?!
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post #12 of 17 Old Oct 29th, 2008, 8:35 pm
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Re: Ever cut the antena down

I have done a fair bit of building antennas for wireless networks. For best results if you are going to modify what you have try to make the antenna a divisible fraction of the wave antenna. I believe, and I could be wrong here, that a quarter wave antenna would be somewhere around 75cm long. I think that puts it at about 2foot 6 inches. If that is too long then you can cut it too 1/8 wave length. You just have to try to stay with in your wave length.

Wave lengths for 100 MHz

300cm full wave length antenna
150cm half
75cm quarter
37.5cm eighth

Full usually produces the best option but that all depends on the type of antenna too, and since no one has a 10 foot antenna hangin' off the bike, BMW didn't think so either.

This is more info than useful. FM isn't nearly as fussy as higher frequency data networks. When you get into GHz ranges, it needs to be fairly precise.

Jeremy
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post #13 of 17 Old Oct 29th, 2008, 10:07 pm
 
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Re: Ever cut the antena down

Quote:
Originally Posted by Jabrown
For best results if you are going to modify what you have try to make the antenna a divisible fraction of the wave antenna. I believe, and I could be wrong here, that a quarter wave antenna would be somewhere around 75cm long. I think that puts it at about 2foot 6 inches. If that is too long then you can cut it too 1/8 wave length. You just have to try to stay with in your wave length.

Wave lengths for 100 MHz

300cm full wave length antenna
150cm half
75cm quarter
37.5cm eighth
FM isn't nearly as fussy as higher frequency data networks. When you get into GHz ranges, it needs to be fairly precise.


Wow this thread just went way above my paygrade!!!!!
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post #14 of 17 Old Oct 30th, 2008, 12:35 am
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Re: Ever cut the antena down

Quote:
Originally Posted by btruex373
Wow this thread just went way above my paygrade!!!!!
I was waiting for something...I just expected it from the ole ham radio operators and their crazy antenna designs.

Jeremy
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post #15 of 17 Old Oct 30th, 2008, 2:37 pm Thread Starter
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Re: Ever cut the antena down

Thanks for all the tips. I think I'll just buy one the length I want and set the bmw one aside for now

Thanks Dave

Dave Selvig
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post #16 of 17 Old Oct 30th, 2008, 5:58 pm
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Re: Ever cut the antena down

here is a picture of my antenna from Crutchfield.
I used the original antenna bracket and added a small bracket to it to hold the antenna. Hope the picture helps, if not I can take more.
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post #17 of 17 Old Oct 30th, 2008, 9:15 pm
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Re: Ever cut the antena down

Quote:
Originally Posted by jaskjb
here is a picture of my antenna from Crutchfield.
I used the original antenna bracket and added a small bracket to it to hold the antenna. Hope the picture helps, if not I can take more.
Thanks, Jim. Good job - pic helps for sure. Best regards.
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