Alternate material j pole construction question.
 

I am experimenting making a j pole out of 1/2 inch conduit. What I am
thinking of doing is making it like a "u" in that each piece, the
radiator, stub and shorting bar are cut at 45 degree angles and welded
togther. I have the dimensions using the 1/2 inch copper. How do i
measure each pieces "length"? I mean in the copper plan they use t
fittings and measure the radiator length starting incide the t fitting
where it is lower than the shorting bar.

My ides was to just measure the end of the angled piece where I cut it
to the top, but not sure if this is right. What do you think?

Also, since an antenna constructed this way will not have an "extended
leg" to mount to a mast, would it be acceptable to mount the shorted
horizontal section to the mast? Will this cause problems?
Any help is appreciated. I hope to work on this tomorrow.

On 21 Jan 2005 05:33:37 -0800, wrote:

I am experimenting making a j pole out of 1/2 inch conduit. What I am
thinking of doing is making it like a "u" in that each piece, the
radiator, stub and shorting bar are cut at 45 degree angles and welded
togther. I have the dimensions using the 1/2 inch copper. How do i
measure each pieces "length"? I mean in the copper plan they use t
fittings and measure the radiator length starting incide the t fitting
where it is lower than the shorting bar.

My ides was to just measure the end of the angled piece where I cut it
to the top, but not sure if this is right. What do you think?

Also, since an antenna constructed this way will not have an "extended
leg" to mount to a mast, would it be acceptable to mount the shorted
horizontal section to the mast? Will this cause problems?
Any help is appreciated. I hope to work on this tomorrow.

I am assuming that you are talking about using EMT conduit.
It will rust pretty quickly and the welds will rust even sooner.
Why not use 1/2 inch copper plumping pipe?
73 de Eskay

Eskay wrote:
On 21 Jan 2005 05:33:37 -0800, wrote:

I am experimenting making a j pole out of 1/2 inch conduit. What I
am
thinking of doing is making it like a "u" in that each piece, the
radiator, stub and shorting bar are cut at 45 degree angles and
welded
togther. I have the dimensions using the 1/2 inch copper. How do i
measure each pieces "length"? I mean in the copper plan they use t
fittings and measure the radiator length starting incide the t
fitting
where it is lower than the shorting bar.

My ides was to just measure the end of the angled piece where I cut
it
to the top, but not sure if this is right. What do you think?

Also, since an antenna constructed this way will not have an
"extended
leg" to mount to a mast, would it be acceptable to mount the
shorted
horizontal section to the mast? Will this cause problems?
Any help is appreciated. I hope to work on this tomorrow.

I am assuming that you are talking about using EMT conduit.
It will rust pretty quickly and the welds will rust even sooner.
Why not use 1/2 inch copper plumping pipe?
73 de Eskay

Yes EMT conduit. I will paint it to keep it from rusting.

I have emt at my house and I can weld it. I dont have enough copper and
I have never soldered copper plus I would have to buy a bunch of
fittings.

On 21 Jan 2005 05:33:37 -0800, wrote:

I hope to work on this tomorrow.

That is all very nice and well, but the tenor of your questions also
suggest that you, being unlicensed, are about to embark upon unlawful
radio transmissions.

This will not pass unnoticed in your community. If you interfere with
any service, there are many hams technically equipped to strip any
notion of anonymity (an illusion even here) from your transmissions -
just like in the movies.

As I pointed out in a past post, there are several radio clubs in your
area. You should join one before they join you.

Richard Clark wrote:
On 21 Jan 2005 05:33:37 -0800, wrote:

I hope to work on this tomorrow.

That is all very nice and well, but the tenor of your questions also
suggest that you, being unlicensed, are about to embark upon unlawful
radio transmissions.

This will not pass unnoticed in your community. If you interfere
with
any service, there are many hams technically equipped to strip any
notion of anonymity (an illusion even here) from your transmissions -
just like in the movies.

As I pointed out in a past post, there are several radio clubs in
your
area. You should join one before they join you.

I do have my license. Why do you think I dont?
It is KG4GER if you dont believe me.

wrote:
I do have my license. Why do you think I dont?
It is KG4GER if you dont believe me.

Hey Don, with a QRZ.com birth date of "01 Nov 0001",
you must have known Jesus. :-)

Why don't you start with the Arrow Antenna design?
It's actually a Zepp design where the driven element
is 1/4WL and the parallel "grounded" element is 3/4WL.
--
73, Cecil http://www.qsl.net/w5dxp


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Stryped wrote:
"I am making a J-pole out of 1/2 inch conduit."

There ia a 144 MHz Super-J in the "ARRL Antenna Book". It`s on page
16-24 of my 19th edition. Individual piece drawings and measurements
are presented for novice builders.

The "Antenna Book" Maritime Antenna is "Super" because it is a collinear
using (2) 1/2-wave sections, in phase, and end to end. For a simple
J-pole, eliminate one 1/2-wave section and the 1/4-wave phase-inverting
stub.

Stainless steel is used fotr the "Super J-pole", but rustable steel can
be used if deesired.

Best regards, Richard Harrison, KB5WZI

On 21 Jan 2005 09:41:17 -0800, wrote:

I do have my license. Why do you think I dont?

Hi Don,

From any of a number of your questions, but that is immaterial.

It is KG4GER if you dont believe me.

It was more a ruse to get you out of the closet. A sign of good
manners and Ham etiquette is to sign occasionally - e.g.

73's
Richard Clark, KB7QHC

Cecil Moore wrote:
wrote:
I do have my license. Why do you think I dont?
It is KG4GER if you dont believe me.

Hey Don, with a QRZ.com birth date of "01 Nov 0001",
you must have known Jesus. :-)

Why don't you start with the Arrow Antenna design?
It's actually a Zepp design where the driven element
is 1/4WL and the parallel "grounded" element is 3/4WL.
--
73, Cecil http://www.qsl.net/w5dxp


----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet
News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World!
100,000 Newsgroups
---= East/West-Coast Server Farms - Total Privacy via Encryption =---

I actually plan to, but will have to order aluminum to do it. I plan on
making both and comparing them.

Ok.

Don
KG4GER