[TowerTalk] Bandwidth of a 1/4wl 80m vertical

[N7mal]

There are several 4 square arrays in daily DX, and contesting, use in 
W6-land. They all (that I'm familiar with)operate both SSB and CW. They use 
tuning at the verticals to achieve both SSB & CW.
73


MAL
N7MAL
BULLHEAD CITY, AZ
http://www.n7mal.com
Everyone in the world is
entitled to be burdened
by my opinion


----- Original Message ----- 
From: Richard (Rick) Karlquist
To: w8zn at comcast.net
Cc: towertalk at contesting.com
Sent: Monday, March 16, 2009 19:41
Subject: Re: [TowerTalk] Bandwidth of a 1/4wl 80m vertical


I did a study of bandwidth vs diameter and there are 3 results:

1.  Bandwidth increases fairly slowly with diameter.

2.  No practical diameter is going to cover 3.5-4 MHz with a
fixed match.

3.  Making the antenna fat lowers the radiation resistance, and
increases ground losses.

I'm going to stick with my 3 inch irrigation tubing, which is
3 inches mainly for mechanical reasons.

Rick N6RK


w8zn at comcast.net wrote:
>
> Hi all,
>
> To those running 80m 4 squares, what kind of bandwidth do you typically 
> see? Is it about the same as a typical dipole or 1/4wl sloper? Does anyone 
> know if using a larger radiator (such as Rohn 25 vs 3"/4" irragation pipe) 
> gives broader bandwidth or is the diameter to wl ratio just too small to 
> make any diff?
>
> thanks!!
>
> Terry