CB Ground Plane


Information and questions on GL1800 Goldwings (2001-2017)
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Terry D
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Joined: Thu Aug 30, 2018 3:35 pm
Location: San Antonio, Texas
Motorcycle: 2005 Honda GL1800

CB Ground Plane

Post by Terry D »



Does anyone think that putting a steel strap in the trunk between the two antenna ground brackets would help increase the ground plane for the CB?


It ain't the destination but the getting there. You are not lost until you run out of gas.

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AZgl1800
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2009 Piaggio MP3 250cc

Re: CB Ground Plane

Post by AZgl1800 »

Terry D wrote:
Tue Dec 03, 2019 8:58 pm
Does anyone think that putting a steel strap in the trunk between the two antenna ground brackets would help increase the ground plane for the CB?
It will improve the situation, but it won't be near as effective as a properly mount CB antenna with proper grounding.

Do not use a steel strap, go to the Auto store, and get the wide brass wire grounding straps, made for the purpose.
~John

'02 GL1800
2009 Piaggio MP3 250cc

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tfdeputydawg
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Re: CB Ground Plane

Post by tfdeputydawg »

The best you can do for a CB on a motorcycle is fine tune the SWR.

Terry D
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Re: CB Ground Plane

Post by Terry D »

I've got good SWR. IT is grounded real good. I was just asking a question that might affect getting more distance. I've even thought of making a plate to fit under the trunk with same dimensions as the trunk to give more refective surface since the antennas are grounded to the same trunk brackets.
It ain't the destination but the getting there. You are not lost until you run out of gas.

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AZgl1800
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Re: CB Ground Plane

Post by AZgl1800 »

Terry D wrote:
Tue Dec 03, 2019 11:46 pm
I've got good SWR. IT is grounded real good. I was just asking a question that might affect getting more distance. I've even thought of making a plate to fit under the trunk with same dimensions as the trunk to give more reflective surface since the antennas are grounded to the same trunk brackets.
No,
you won't gain any more distance to be useful, maybe a few yards.
the signal decreases by an order of the square of the distance.
don't recall the formula, but it will not make any practical distance difference.

the length of the antenna "should be" 108 inches, and the ground plane should be the same radius.

the bike is a very compromised antenna situation.
my 1800 gets about 2 miles at best... beyond that, it is not strong enough to break the squelch on anyone's radio.
~John

'02 GL1800
2009 Piaggio MP3 250cc

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GoldWingrGreg
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Re: CB Ground Plane

Post by GoldWingrGreg »

Since there is no complaint in the OPs question, let me offer this info.

If it helps, and if using an OEM cb antenna, if the antenna is tuned the RF meter will go from 3-4 down to a 1.1.

People who do tune their antenna can reach further than other riders in the same group with untuned antennas. Usually about 3/4-1" is removed. The only down side is that the cb antenna is noticeably shorter than the radio antenna.

As AZgl1800 stated, most at best will reach 2 miles; however, a tuned antenna will reach that distance far more often. While the other 1.0-1.5 miles.

Terry D
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Re: CB Ground Plane

Post by Terry D »

Yes, when I first installed my CB, I tuned my antenna from 3.6 down to 1.3 by taking off about like stated 3/4 to an inch.


It ain't the destination but the getting there. You are not lost until you run out of gas.

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