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GeoB
Joined: 16 Jun 2009
Posts: 207
Location: Fresno, CA
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 Posted: Wed Jan 25, 2012 2:54 pm Post subject: Kolb-List Digest: 17 Msgs - 01/24/12 |
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| Quote: | Ground is ground is ground, to paraphrase Gertrude Stein.
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Welll.. Gertrude Stein is not always right.
This concept may have aircraft application but I run into it with ground
vehicles mostly...
At high frequencies, radio frequencies, electrical current begins to flow
along the surfaces of conductors more and more, and less in the interior.
When using a ground strap or cable to connect surfaces which are part of a
ground-plane for a radio antenna one should consider using a braided copper
strap. This has a greatly increased surface area over a solid conductor.
When I install a CB on a 4x4 the antenna is typically a ground-plane type.
The hood, tailgate and top of the vehicle or the entire vehicle is
effectively part of the antenna. If done properly the hood needs to be
grounded by a braided strap to the rest of the vehicle. In cases where the
antenna is mounted on the tailgate EXTRA care must be made to insure that it
has a quality ground to the vehicle body.
I think our aircraft frequencies are high enough that our wave length is
short enough that our ground planes are small enough that the entire vehicle
is not involved... just maybe a metallic disk under the antenna (or an array
of copper radials). In those cases no braided strap is necessary.
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GeoB
"Members of Congress should be compelled to wear uniforms like NASCAR drivers, so we could identify their corporate sponsors" |
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Wed Jan 25, 2012 7:40 pm Post subject: Kolb-List Digest: 17 Msgs - 01/24/12 |
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Reading and comprehension, George, reading and comprehension. The discussion was about the brown ground wire in the wiring harness, or as Rotax calls it (at least by translation) the mass cable, brown, and to what it can be connected. There was no mention of radios, it was about connecting the Key West regulator.
Rick
On Wed, Jan 25, 2012 at 4:51 PM, George Bearden <gab16(at)sbcglobal.net (gab16(at)sbcglobal.net)> wrote:
| Quote: | --> Kolb-List message posted by: "George Bearden" <gab16(at)sbcglobal.net (gab16(at)sbcglobal.net)>
> Ground is ground is ground, to paraphrase Gertrude Stein.
Welll.. Gertrude Stein is not always right.
This concept may have aircraft application but I run into it with ground
vehicles mostly...
At high frequencies, radio frequencies, electrical current begins to flow
along the surfaces of conductors more and more, and less in the interior.
When using a ground strap or cable to connect surfaces which are part of a
ground-plane for a radio antenna one should consider using a braided copper
strap. This has a greatly increased surface area over a solid conductor.
When I install a CB on a 4x4 the antenna is typically a ground-plane type.
The hood, tailgate and top of the vehicle or the entire vehicle is
effectively part of the antenna. If done properly the hood needs to be
grounded by a braided strap to the rest of the vehicle. In cases where the
antenna is mounted on the tailgate EXTRA care must be made to insure that it
has a quality ground to the vehicle body.
I think our aircraft frequencies are high enough that our wave length is
short enough that our ground planes are small enough that the entire vehicle
is not involved... just maybe a metallic disk under the antenna (or an array
of copper radials). In those cases no braided strap is necessary.
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GeoB
Joined: 16 Jun 2009
Posts: 207
Location: Fresno, CA
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| Posted: Thu Jan 26, 2012 2:01 am Post subject: Re: Kolb-List Digest: 17 Msgs - 01/24/12 |
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rickofudall, when you are capable of teaching me 'reading and comprehension' come talk to me, Mr. Forum Monitor.
I guess I was expecting too much comprehension from you when I quoted the portion of the message I was responding to; "Ground is ground is ground, to paraphrase Gertrude Stein".
Also I was wrong to point out I was introducing a new topic, albeit clumsily, when I said "This concept may have aircraft application but I run into it with ground vehicles mostly". Please forgive me.
The fella touched on a peripheral topic of potential interest to technically minded folks in a technical forum on a technical thread, and I wanted to clarify what he said as it wasn't technically correct. What I said may help somebody someday. But I was wrong and offensive to go there. I am so sorry.
I know it was terribly wrong for me to have posted that, but tell me... what forum goal have you furthered by lashing out at me?
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GeoB
"Members of Congress should be compelled to wear uniforms like NASCAR drivers, so we could identify their corporate sponsors" |
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