Comments on: A cheap J-Pole antenna for 50 Mhz

By: Pete

Pete — Tue, 18 Oct 2011 21:37:20 +0000

Grade school math:
1 inch = 2.54 cm = 25.4 mm, therefore 1 mm = 1/2.54 =.03937 inches.
1 meter = 100 cm =39.37 inches = about 3″ longer than a yard.

The metric system is sooo easy to work with compared to 1nches, feet, yards…. The only problem is that in the US we don’t use it therefore we don’t have a good feeling for how long a meter or cm is. Too bad we didn’t convert a long time ago.

Thus we have some hams not being able to say almost instantly how long a dipole for 6 meters is (in feet). Of course it is 3 meters, which is about 10 inches longer than 3 yards.

By: John W.F. Bley

John W.F. Bley — Mon, 06 Jun 2011 16:53:10 +0000

QUITE A SITE WITH LOTS OF INFO.

I WAS LOOKING FOR A PORTABLE ROLL-UP TYPE OF 6 MTR J-POLE ANTENNA THAT I CAN HANG-UP ANYWHERE.

ANNY SUGGESTIONS?

TXS & 73′s

VE6MAQ John Bley Strathmore Alberta Canada

By: Erwin

Erwin — Sat, 21 May 2011 16:06:33 +0000

Thanks for this nice description. By the way Jimmy Young is maybe thinking he is the only ham on the world Hi.
Most of the country’s don’t use this old sizes. You are correct to put it in meters and cm. Did you ever hear from a 20 ft. band ???.
Not in Hand and Feet.

Regards

By: Pirate Paul

Pirate Paul — Mon, 13 Dec 2010 14:36:41 +0000

Like any half-wave, the J-pole is essentially independent of DC or RF ground, although a DC ground might be a good idea for static or lightning defense. The latter is built-in to the design.

By: jimmy young

jimmy young — Tue, 07 Dec 2010 22:08:46 +0000

please put the dimensions in ft and inches and where i put the tee to start the j part and how far it is from the main pole how long the matcher is and where to put the coax ends i want to buid a 6 meter j polo out of copper why do you use metric ?this is the united states not overseas hope to hear from you 73s

By: Mark Bohrer

Mark Bohrer — Fri, 15 Jun 2007 15:46:34 +0000

IW5EDI –
I purchased a 146MHz J-pole at a swap meet, and have adapted it to fit on a small Gitzo tripod with a Bogen Superclamp (I had them lying around, I’m a freelance photographer, among other things).

My question is – will I be able to transmit on the properly-adjusted J-pole without grounding it to earth?

In other words, will the handy-talkie’s own ground suffice?

Thanks.