"blair thompson" wrote in message
...
I'm certain this question must have been dealt with before,
but I recently acquired a Cushcraft R5 vertical which looks a bit
weather-beaten.

I was wondering whether, if I aerosol-sprayed the aluminum,
elements, with an appropriate color, it might impair the performance
of what is already a compromise antenna. I know radio waves don't care
about appearance, but I would like to "tart it up" a bit.

Thanks for any information.
73
Blair VE7HHH

Blair,

John Tait, EI7BA has a good web page on the Cushcraft R5/R7 antenna
http://www.iol.ie/~bravo/r7_vertical.htm

My preference for aluminum is NOT to paint it. Shiny aluminum can not exist
long in an
oxygen environment without developing a dull gray patina (reaction of AL
with O2).
This patina is conductive.

I do not like to use steel wool (dissimilar metal abrasives) and any small
iron/steel particles
left on the antenna will rust (brown).

I usually use a scotchbrite-type pad ... a very mild lye (sodium hydroxide)
in a well ventilated area AND plenty of water.
http://www.ccohs.ca/oshanswers/chemi...basic_sod.html
CAS Registry Number for sodium hydroxide is 1310-73-2. This number is
assigned by the Chemical Abstracts Service (CAS) in the United States and is
used as a unique identifier number world-wide.

Once the aluminum is shiny, wash the aluminum well to remove remaining NaOH.

Dry and then apply a clear finish to preserve the shiny. The clear finish
can not be used electrical and RF conductivity is desired (inside
compression fittings of sections).

IF you desire to paint any fiberglass on the antenna, there are a number of
products for the auto and marine industry for

that application.

Greg, w9gb

"G.Beat" wrote in message
news:naQrc.24177$zw.4857@attbi_s01...
"blair thompson" wrote in message
...
I'm certain this question must have been dealt with before,
but I recently acquired a Cushcraft R5 vertical which looks a bit
weather-beaten.

I was wondering whether, if I aerosol-sprayed the aluminum,
elements, with an appropriate color, it might impair the performance
of what is already a compromise antenna. I know radio waves don't care
about appearance, but I would like to "tart it up" a bit.

Thanks for any information.
73
Blair VE7HHH

Blair,

John Tait, EI7BA has a good web page on the Cushcraft R5/R7 antenna
http://www.iol.ie/~bravo/r7_vertical.htm

My preference for aluminum is NOT to paint it. Shiny aluminum can not
exist
long in an
oxygen environment without developing a dull gray patina (reaction of AL
with O2).
This patina is conductive.

Aluminum oxide is conductive?!

Ed
WB6WSN

Blair,

John Tait, EI7BA has a good web page on the Cushcraft R5/R7 antenna
http://www.iol.ie/~bravo/r7_vertical.htm

My preference for aluminum is NOT to paint it. Shiny aluminum can not
exist
long in an
oxygen environment without developing a dull gray patina (reaction of AL
with O2).
This patina is conductive.

Aluminum oxide is conductive?!

Ed
WB6WSN

Ed -

Good catch. Getting ahead of my fingers. To avoid seizing when assembling
the
telescoping elements of your Cushcraft antenna, you should coat the
inner element with PENTROX-A by Burndy. This can be found at any
electrical distributor.
Many Home Depot stores also carry the product.
It is conductive and will avoid seizing between these aluminum elements.

w9gb

"G.Beat" wrote in message
news:naQrc.24177$zw.4857@attbi_s01...

[...snip...] This patina is conductive.

OOPS! Aluminum oxide, or Alumina, is very non- conductive. It is a
ceramic used for as a base high Q circuits at 150 Mhz and above (stripline
and microstrip). It is also what is grown on the surface of "anodized"
aluminum in the anodization process. It is also why aluminum is so hard to
solder. The oxide forms immediately on contact with air. Aluminum is the
most reactive metal.

--
Steve N, K,9;d, c. i My email has no u's.

On Mon, 24 May 2004 16:47:33 -0500, "Steve Nosko"
wrote:

[snip]

| Aluminum is the most reactive metal.

Really?

Wes Stewart wrote:

wrote:
| Aluminum is the most reactive metal.

Really?

Not really. When I was at Texas A&M, someone wrapped a
large lump of sodium in a towel and flushed it down the
john. It blew the plumbing apart.
--
73, Cecil http://www.qsl.net/w5dxp



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Cecil Moore wrote in message ...
Wes Stewart wrote:

wrote:
| Aluminum is the most reactive metal.

Really?

Not really. When I was at Texas A&M, someone wrapped a
large lump of sodium in a towel and flushed it down the
john. It blew the plumbing apart.

A couple of us Juniors in chem lab did the deed in high school in
1954. Didn't take out any hardware but it took the janitors a week to
clean the ceilings. Fortunately there was nobody "Smokin' In The Boy's
Room" . .

Must have never worked w/ Sodium, NaK (sodium- potassium alloys, usually
liquid phase at room temperature) or Lithium-Aluminum alloys. Never had the
pleasure to work w/ pure Li but I'd guess it is entertaining to say the
least.

Aluminum is quite reactive, fortunately aluminum oxide is quite stable, and
usually forms quickly, quietly and uneventfully.

Scotchbrite pads would be better than steel wool to clean it up.



"Wes Stewart" wrote in message
...
On Mon, 24 May 2004 16:47:33 -0500, "Steve Nosko"
wrote:

[snip]

| Aluminum is the most reactive metal.

Really?

Aluminum is the
most reactive metal.

Damn, I thought Na was.
Boy ya sure learn a lot on these groups.
WG8Z
Greg Z
to thine own sound be true

Maybe this post was the inspiration for the one on rec.radio.misc from a guy
looking for a lump of sodium !

jw
K9RZZ