There is certainly enough to act as a counterpoise, especially at the upper part of the HF band, That I have proven.
A semi is great for 40 meters. Proven that too.
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Will a 36” x 24” x 1/4” thick aluminum plate work ok for a ground plane for a 102” whip antenna?
- Thread starter 63Sprint
- Start date
A semi is great for 40 meters. Proven that too.
jhooten
Member
Did you bother to read the material I quoted?
Don't forget the bonding straps between the tractor and the trailer.
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slowmover
Active Member
Tractor & Trailer
Graphite 5th wheel grease (conductive) after scrape, and hot water, high-pressure wash. Trailer kingpin area, also.
RF Bond plate to mount. Mount to frame.
Haz Mat fuel tanker (study). Static wicks, etc.
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Yes I did read the information. Thanks.
I decided to purchase a Pro Comm, Proton, PT99 antenna. I’m working on the mount for the camper.
The 102” whip will be worked with after the base antenna mount is completed.
jhooten
Member
How did you determine the vehicle body alone was acting as the ground plane, eliminate the capacitive coupling to the earth?
Yes, but you can't understand what I post, and yes, you got lots of lights on semi trailers that would not work without a good ground.
Well, I am not going to write a book here and capacitive coupling to earth is so insignificant it doesn't enter the equasion.
Here is a deal I will make: break out your sliderule and a VNA. Read through chapter 16 of ARRL antenna book, study thouroughly.
If you find anything that disagrees with what I post, and show with VNA results, I will never say another word about mobile antennas.
Some other links to information that can help you:
Understanding the Quarter-Wave Ground Plane Antenna – Practical Antennas
practicalantennas.com
Antenna Ground Plane Theory for RV and Boat Cellular Connectivity
Part of omnidirectional cellular antenna design is a ground plane - or metal that reflects signal into the antenna itself.
www.rvmobileinternet.com
Sorry if I seem to be hijacking the thread. These antennas are on different bands and the separation there is very little interaction.
This setup looks to me like it would do very well.
That antenna myths site has some good fundamental information but I think the statement ' A vehicle is not a ground plane for an HF antenna. Rather, it acts like a capacitor' is misleading and no specifics about frequency. It may be true when talking 160 to 20 meters.
Australia outback, they use 2, 3, 4, 6 MHz in mobile, but now we are talking broad band end fed whips with tuners. Very effective.
jhooten
Member
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