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Subject:
Re: 80 meter stack
From:
David W Wood <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Sat, 10 Jan 2015 11:04:48 -0000
Content-Type:
text/plain
Parts/Attachments:
text/plain (85 lines) 
Hi Alan and all

As you point out, phasing is essential with such antennas.
This is why most of the DX-peditions use elevated radials when using phased
vertical arrays.
They can cut them to length at home, make ure that the phasing is correct,
and not be reliant on the vagaries of ground conductivity.

I think that it was the five star Spratley Island group who first used this
system.

73

David W Wood 

-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Alan R. Downing
Sent: Saturday, January 10, 2015 5:35 AM
To: [log in to unmask]
Subject: Re: 80 meter stack

Yes, that is a good part of the extra gain.  Additional gain also comes from
exactly matching the electrical lengths of the phasing lines.  In order to
get the phasing lines to match, it is necessary to use a network analyzer
when cutting the cables.


Alan R. Downing
Phoenix, AZ


-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Phil Scovell
Sent: Friday, January 09, 2015 9:42 PM
To: [log in to unmask]
Subject: Re: 80 meter stack

Alan,

Is the gain so good because the stack spacing is approaching a half wave on 
80?


> From: Alan R.  Downing
> Sent: Wednesday, December 31, 2014 5:07 PM
> To: [log in to unmask]
> Subject: 80 meter stack
>
> Good afternoon all.  As you all know, I am working with KH6CG to
> build his
> super station in northern Florida.  From time to time I have
> mentioned what
> we have been up to in preparing for one band or another.  The
> latest
> decision is to put up a pair of full sized 2 element 80 meter
> yagis.  The
> lower of the pair will be installed at about 90 feet, and the
> upper one at
> 200 feet.  The gain for this stack of 80's will exceed 10 DBD,
> which is
> unheard of for 80 meter antennas.  When the station is finally up
> and
> running, I will report back on how the various stacks are
> performing on each
> band.  Stan and I are excited beyond belief.
>
>
>
> Happy New Year everyone
>
> N7MIT
>
>
>
>
>
>
>
> Alan R.  Downing
>
> Phoenix, AZ
>

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