Hi all,

I've been away from ham radio for quite some time, and I am looking to
get my ht up and running. I want to make a J-pole.

Although I have found some plans to do so, I was looking more for the
science behind it.

I see that the stub is 1/4 wave and the other side is 1/2 or 3/4.

I forget the formula to find the wavelength. Was it the freq divided
by 468 or 234?


any help would be great.

kb2tfa

See BuxCom at URL:
http://www.commparts.com/antutorial.htm#2mjpole

Also URL:
http://www.cmara.org/N1WAS1.htm


wrote in message
oups.com...
Hi all,

I've been away from ham radio for quite some time, and I am looking to
get my ht up and running. I want to make a J-pole.

Although I have found some plans to do so, I was looking more for the
science behind it.

I see that the stub is 1/4 wave and the other side is 1/2 or 3/4.

I forget the formula to find the wavelength. Was it the freq divided
by 468 or 234?


any help would be great.

kb2tfa

wrote in message
oups.com...
Hi all,

I've been away from ham radio for quite some time, and I am looking to
get my ht up and running. I want to make a J-pole.

Although I have found some plans to do so, I was looking more for the
science behind it.

I see that the stub is 1/4 wave and the other side is 1/2 or 3/4.

I forget the formula to find the wavelength. Was it the freq divided
by 468 or 234?


any help would be great.

kb2tfa

Try looking in wikipedia for Wavelength.

wrote:
I forget the formula to find the wavelength. Was it the freq divided
by 468 or 234?

Wavelength is 984 divided by the frequency. 468/f is the
length of a 1/2WL dipole and 234/f is the length of a
1/4WL monopole both taking end effects into account.
--
73, Cecil http://www.w5dxp.com