[50mhz] Cushcraft A50-3S Question

[Marvin L. Jones]

On Mon, 11 Feb 2008, George McCrary wrote:

>I'm getting ready to put a used (good condition) A50-3S up at about 57 feet.
>I currently have the antenna on an 8 foot mast leaning against a pine tree.
>
>I've set the antenna up for resonance at 50.0 MHz according the measurements
>in the manual. When I measure the VSWR I actually get a dip at around 50.8
>MHZ where the VSWR is about 1:1. The VSWR at 50.0 is almost 3:1.
>
>Are the measurements in the manual that unreliable, or is the antenna being
>affected by it's proximity to the tree and ground?

Maybe.  Probably.  No doubt.

Using a tall wooden or fiberglass step-ladder -- full clear of any
nearby structures, clamp the mast to the top platform with the antenna
pointing STRAIGHT UP.

Now (re)do your SWR measurements -- and insure that _you_ are nowhere
inside the antenna's capture area.

Jonesy
-- 
  Marvin L Jones     | jonz         | W3DHJ  |  linux
   Pueblo, Colorado  |  @           | Jonesy |   OS/2     __
    38.24N  104.55W  |   config.com | DM78rf |            SK