If I am not mistaken the wire wrapped around the antenna has somthing to do
with the keyless entry system, your remote.
And the little black dots in the front windshield are maybe perhaps the
instant defogger, if your car is equiped.
The spiral on the radio antenna is a wire wound around a fiberglass core
so the antenna is longer than if it was just a straight rod. I think
(not certain) that the dots are the XM antenna.
Steve Mackie wrote:
Incorrect statements so far:
"The wire is wrapped around to make for a longer antenna."
"The dots are the XM radio antenna."
"The wire wrapped around is for the RKE."
"The black dots are an 'instant defogger.'"
Why are people insistant on guessing? Do some research.
Like I said:
"Heh, the "spiral" you see is used to reduce wind noise and the black dots
are part the black band around the perimeter of the windshield to protect
the adhesive from the sun."
But I will narrow down my statement a little bit. The "sprial" on GM
antennae are to reduce wind noise, probably the same for other
manufacturers, but can't be sure.
The black dots you see are silkscreened onto the glass and then actually
burnt into the glass in a furnace. The main purpose is as stated earlier, to
protect the adhesive that sticks the glass in the vehicle. UV light would
degrate the adhesive. Also the dots simply make it look better. If you
looked at the glass from the outside and the border was not there the
adhesive would look terrible. I don't know if it is intentional or not but
the border also adds to strength. Although your windshield is not tempered
it is heat treated. If you had a single section of your windshield without
the safety film in the middle break, the border would actually bond the
fragments together to a extent. I worked 9 yrs at a glass factory, spent 4
yrs operating silk screeners and 2 years on a tempering furnace. On the
furnace I broke a finished panel every 15 minutes for DOT required testing.
Look for DOT 247 on your glass. Under names TGS, Spec-Temp and several other
customer names. I might have had something to do with it.
Spend a little time studying antenna design and you might find that you
need to revise your opinion in favor of scientific fact. Read some of
the antenna manufacturers literature, or cut an antenna open. The
spiral wire is for the AM radio band.
OP said "black dots on the upper portion of the windshield", nothing
about dots around the perimeter of the glass..
Steve Mackie wrote:
You have got to be kidding me. *sigh*
THE SPIRAL YOU SEE WRAPPED AROUND YOUR AUTOMOTIVE ANTENNA IS THERE TO REDUCE
Just confirmed that not only has GM done so, Mitsubishi as well. Here's a
quote from Mitshubishi's website:
"....identify an aeolian tone noise from the pole antenna. Subsequently,
generation of the noise was restricted by using a wire spirally wrapped
around the antenna. The diameter of the wire is 0.2 times the diameter of
Here's a link to the article:
Now how about a quote from the SAE website?
DaimlerChrysler's Peter Gladysz, a Senior Manager in vehicle development and
synthesis says, "Daimler- Chrysler's NVH lab works on all platforms
simultaneously, so if anything can be utilized cross-platform - like going
to a spiral cut antenna to stop whistle noise - it spreads throughout the
Here's a link to the article:
Now, I say to you:
"Spend a little time studying antenna design and you might find that you
need to revise your opinion in favor of scientific fact."
Correct answer BUT wrong method of repair.
The spiral is actually cut into the stainless shaft that the antenna is
made from. The end ball and the mounting screw fitting with locktite are
then pressed on. Then it goes through a wash and pretreat and then
through a powder coat booth. Ford and Chrysler were the first to use the
spiral cut to both reduce wind noise and to reduce antenna harmonic
motion due to wind drag. GM followed VERY shortly, The only real
drawback is the spiral cut antennas are not as strong as the standard
shaft units and they make lousy window breakers ( take a course on EMS
vehicle extrication for that neat trick ) because of it.
Oh and if you own a Ford or Chrysler with a fixed antenna it was
probably made in Amsterdam NY by Ward Products. The chrome or black
spanner nut securing it was produced by Manth/Brownell near Kirkville
NY. It was also painted by either WW Custom Clad or Sumax powder
coaters. And at least 30,000 of them were scrapped after WW had a fire
that damaged the coating after they were processed.
"Steve Mackie" < firstname.lastname@example.org> wrote in message
All this discussion is fine about how the shaft is cut but it doesn't
explain the wire wrapped around the outside of the shaft. I stand by my
original posting which is based on standard radio science, try you local
library for the ARRL Antenna Book, written in plain language and found
in many libraries as it has been used by hundreds of ham operators to
understand antennas and to build their own.
No one has yet to post a better response for the group of dots at the
upper center of the windshield, yes there are dots in other places that
have other purposes and it is very interesting to know but thats not the
topic of this thread.
Steve W. wrote:
I posted a couple of quotes on why the wire is there. Written in black and
white for you to read without going to a library. We are not talking about
ham radios, we are talking about automotive antenna, and THE WIRE IS THERE
TO REDUCE WIND NOISE.
As for the dots, the OP will have to take a picture and send it through to
give an answer. He didn't say "group of dots at the upper center of the
windshield," he said "the grid of black dots on the upper portion of the
windshield." With that, I can guaruntee that 99.9999999% of black dot
patterns on windshields are part of the black band provided to protect the
adhesive from the sun.
There is NO WIRE. The spiral pattern is cut in the steel of the antenna.
NO WIRE wrapped around it.
As for the dots it depends on which dots and where. There are
positioning marks on most windshields for the bots to use when they
place the glass in the frame. There are also the ones that are printed
to block the adhesive around the edges.
Don't need any antenna books.
"Robert Ball" < email@example.com> wrote in message
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