Assistance with HF antenna
 

Repeat of earlier post which failed to make it into the NG! Devoured by ISP
?

Hi folks
Although licensed for over 12 years, converting 3 years ago to a
M0...callsign (with 12 wpm cw), personal circumstances have not until now
permitted me to get started on HF.

Problem now is antennas (and indirectly xyl).

Would initially like to cover 14 - 7 and 3.5 MHz with a coax fed
horizontal wire dipole of approx 66', which if carefully cut would
theoretically give full - 1/2 and 1/4 wave respectively for these bands.
An MFJ-949E Atu is available.
Garden to rear of property, narrow but 80' long from house to boundary.
A further 25' is available along side of property, rear to front, but
approx 6' proximity to house wall.
Height of proposed feedpoint approx 17' 6" ; height at boundary 12'
No garden or roof space for any vertical metal!

That's the idea - but I would welcome constructive comment, especially in
the area of feedpoint impedances and swr.
Also would 450 ohm feeder be better than coax ?
My thanks in anticipation. . . .
Bert

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On Wed, 20 Aug 2003 20:24:48 +0100, "Jim"
wrote:

Would initially like to cover 14 - 7 and 3.5 MHz with a coax fed
horizontal wire dipole of approx 66', which if carefully cut would
theoretically give full - 1/2 and 1/4 wave respectively for these bands.
An MFJ-949E Atu is available.

Hi Bert,

You seem to have enough room (as long as the length is broadside to
the direction you want to transmit).

You will encounter Hi-Z at some point. Cut another dipole (half size)
to attach to the same drive point and hang its ends a foot below the
larger, original one you planned.

Remember to choke the feed point and you won't bother the household or
neighbors (as much).

73's
Richard Clark, KB7QHC