antennas for Susan

[Eric Manning]

Susan Said:

the antenna farm will most likely be vertical and located right at the shore line.

What suggestions do you have for me to construct for antennas?

________

I had very good luck with a Force 12 Sigma 5, a CENTRE-FED inductively loaded
short half-wave vertical [i.e.,  a short centre-fed dipole tipped up on one end ]
on  the Bay of Bengal shoreline.

It being a centre-fed half-wave, not an end-fed quarter-wave, I didn't have to worry about
an efficient ground-plane,so no lossy radials,  and on the shoreline of salt water it really got out.
Very good reports with a K2 at 10w. It also fits into a gym bag.

I think a Caribbean DXpedition also used similar antennas and K2s near salt water.

eric
VA7DZ



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[Cookie]

Not to pick nits, but to clear up a point Eric.  While radials are not required
for a center fed vertical the salt water surrounding the antenna is still
important and the vertical will work much better on a beach than in the desert. 
The intermediate field conductivity is very important to the take off angle of
any vertical, but the only thing you can do about it is to move.  The US Navy is
fond of the center fed vertical for ship board use, even when they have a great
built in ground plane.  The Force 12 is an antenna that I have not looked at
carefully.  I will have to do that.
 Willis 'Cookie' Cooke
K5EWJ




________________________________
From: eric manning <[hidden email]>
To: [hidden email]
Sent: Mon, August 2, 2010 12:23:17 AM
Subject: [Elecraft] antennas for Susan

Susan Said:

the antenna farm will most likely be vertical and located right at the shore
line.

What suggestions do you have for me to construct for antennas?

________

I had very good luck with a Force 12 Sigma 5, a CENTRE-FED inductively loaded
short half-wave vertical [i.e.,  a short centre-fed dipole tipped up on one end
]
on  the Bay of Bengal shoreline.

It being a centre-fed half-wave, not an end-fed quarter-wave, I didn't have to
worry about

an efficient ground-plane,so no lossy radials,  and on the shoreline of salt
water it really got out.
Very good reports with a K2 at 10w. It also fits into a gym bag.

I think a Caribbean DXpedition also used similar antennas and K2s near salt
water.

eric
VA7DZ



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[Ralph Parker]

The SVDA (vertical dipole near salt water) has proven itself in many
DXpeditions. Relatively easy to build. The 2 element has good gain.
Google "SVDA antenna". Here's the first one -

http://www.elecraft.com/DXpeditions/QRP_is.pdf     (note the website :-)

I'll be looking for you.

VE7XF

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