Firestik antennas - BMW Luxury Touring Community
 
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post #1 of 10 Old Jul 24th, 2009, 4:51 pm Thread Starter
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Cool Firestik antennas

Anyone install a Firestik on an LT hooked up to the C.B.? Seems always a grounding problem with the BMW C.B. antenna system. Thanks Tim :
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post #2 of 10 Old Jul 24th, 2009, 5:06 pm
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Re: Firestik antennas

Quote:
Originally Posted by roadking04
Anyone install a Firestik on an LT hooked up to the C.B.? Seems always a grounding problem with the BMW C.B. antenna system. Thanks Tim :
No fFirestik experience, but what's the issue(s) with the BMW antenna grounding? I just installed one on my R12RT, and the only "problem" was the 49-gazillion grounding connections required to install the grounding harness.

Mark Neblett
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post #3 of 10 Old Jul 24th, 2009, 5:10 pm Thread Starter
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Re: Firestik antennas

The problem I am having is works great receiving and transmitting when motor off but when running can still receive but transmitting my fellow riders say cant understand me.
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post #4 of 10 Old Jul 24th, 2009, 5:26 pm
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Re: Firestik antennas

Quote:
Originally Posted by roadking04
The problem I am having is works great receiving and transmitting when motor off but when running can still receive but transmitting my fellow riders say cant understand me.
A couple more Qs --

Do you have the BMW grounding harness installed (looks like a bunch of snakes tied together -- grounds at 4-5 places around the chassis).

Have you verified that where the antenna bolts to the bracket, there is no short to the bracket? On my RT (same antenna, I believe), there is a white plastic ring which concentrically locates the antenna base while also isolating the base from the bracket.

What do your friends say your transmissions sound like? Electrical noise overlaid over your transmission, effectively drowning it out? Slurred speech? Reduced voice volume to the point that your words are unintelligible?

Mark Neblett
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post #5 of 10 Old Jul 24th, 2009, 5:37 pm Thread Starter
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Re: Firestik antennas

Cb was working fine when I purchase the new lower BMW headset cords. Now dont . Yes I checked all the many grounds but did not check the base of the antenna for corrosion. Friends say sounds like electrical noise.
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post #6 of 10 Old Jul 25th, 2009, 9:53 am
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Re: Firestik antennas

For what it's worth I have an old Firestik CB antenna installed on a home made bracket on my '05 LT. Works great and was cost effective since I already had the antenna and scrap metal that I used to make the bracket lying around the workshop. However, I too had an issue with noise when transmitting on my CB. Receiving worked just fine but my transmission was washed out with lots of noise and a high pitched squeal. The solution that I found after about a year of experimenting was to use an RF choke on both the antenna line and another on the power line to the radio. Here's the Radio Shack part number that I used; RF Choke Catalog #: 273-104. It's a 2 piece torroid and so is very easy to install. Hope this helps.

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post #7 of 10 Old Jul 25th, 2009, 5:43 pm Thread Starter
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Cool Re: Firestik antennas

Lynn, Thanks I went to Radio-Shak and picked up set to try. Any particular way to wrap wires?

Thanks Tim
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post #8 of 10 Old Jul 25th, 2009, 9:47 pm
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Re: Firestik antennas

This goes into the FWIW category: *I* could never see and hence never trusted thee 'groundless' antenna designs.It just goes against everything I have learned AND EXPERIENCED.

I know I will get "But they provide almost perfect SWR even without grounding", Quite frankly there are a few other devices that do the same: e.g. resistors and nobody has the idea of calling a resistor an antenna.

But then weirder things have been 'marketed'.

Bottom line: ESPECIALLY on low frequencies like CB you just can't get around proper grounding AND proper RF counterweights, which in itself is a problem on a motorcycle, especially on a plastic bike like the LT.
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post #9 of 10 Old Jul 26th, 2009, 9:41 am
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Re: Firestik antennas

Quote:
Originally Posted by roadking04
Lynn, Thanks I went to Radio-Shak and picked up set to try. Any particular way to wrap wires?

Thanks Tim
Nothing special. I think I got about 4 turns on each side of the toroid. As I recall there's a brief diagram included with the product which should give adequate instruction. Good luck.

Lynn Keen
North East Florida
MSF #28271 Retired
'99 Canyon Red RETIRED AT 93,000 MI
'05 GRAPHITE METALLIC retired at 87,000 MI
'01 R1150 GS- totaled
'02 R1150 GS sold
'85 K100/EML sidecar sold
'11 R1200RT currently being enjoyed

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post #10 of 10 Old Jul 26th, 2009, 12:26 pm
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Re: Firestik antennas

Quote:
Originally Posted by roadking04
Anyone install a Firestik on an LT hooked up to the C.B.? Seems always a grounding problem with the BMW C.B. antenna system. Thanks Tim :
Got one on the RT and LT both work great. Also bought the splitter, so only have one antenna for the CB and radio.

John
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Contact me 4 motor training 1&1
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