On Apr 6, 2:51*pm, John - KD5YI wrote:
How about yours?

I used an EZ file that I already had. It was 40 feet high and I
rounded off the feedpoint impedance. I thought that would be a close
enough approximation.
--
73, Cecil, w5dxp.com

On 4/6/2011 11:19 PM, Cecil Moore wrote:
On Apr 6, 2:51 pm, John - wrote:
How about yours?

I used an EZ file that I already had. It was 40 feet high and I
rounded off the feedpoint impedance. I thought that would be a close
enough approximation.
--
73, Cecil, w5dxp.com

I understand. Of course, it's close enough. I was just wondering why my
answers did not agree with yours, but now I do.

Thanks,
John

On Wed, 6 Apr 2011 03:56:21 -0700 (PDT), "
wrote:

What SWR reading could I expect to see...?

15:1

73's
Richard Clark, KB7QHC

On Wed, 06 Apr 2011 03:56:21 -0700, wrote:

Let's say I build a horizontal dipole, trimmed for minimum SWR @ 7.200
mhz. I'll probably use 14-16 gauge insulated house wiring for this
antenna. It'd be a "nominal' quarter wavelength per leg.

This dipole will be fed with 50 ohm coax, and it will be erected
horizontally, 30 feet high over "average" ground.

What SWR reading could I expect to see from this antenna if I tried to
use it at 21.300 mhz........in the same environment as stated above?

Thanks, folks......

FjLee KA0FPJ

Google a fan dipole. It sounds like something you may be interested in

On Wed, 6 Apr 2011 03:56:21 -0700 (PDT), "
wrote:

Let's say I build a horizontal dipole, trimmed for minimum SWR @
7.200 mhz. I'll probably use 14-16 gauge insulated house wiring for
this antenna. It'd be a "nominal' quarter wavelength per leg.

This dipole will be fed with 50 ohm coax, and it will be erected
horizontally, 30 feet high over "average" ground.

What SWR reading could I expect to see from this antenna if I tried
to use it at 21.300 mhz........in the same environment as stated
above?

Thanks, folks......

FjLee KA0FPJ


Just put it up and see what happens.

Slap a tuner in the line.

Or check out a fan dipole.

Or buy a pair of 15 meter traps and use the design sheet that comes
with them to build a 40-15 trap dipole.
http://www.unadilla.com/?p=34