[TowerTalk] 2 el yagi question

[Jim Lux]

On 5/18/12 7:36 AM, W8AEF wrote:
> You will get slightly more gain with a reflector.
>
> Tuning a vertical array is easy.  Install a sample vertical antenna about
> 100 feet away, decouple both antennas from their feed lines and connect your
> receiver to your vertical dipole and a signal source with a fixed output
> level to your sample antenna.  Use S meter lite on your receiver and sweep
> the frequency of interest and log the AGC voltage to establish normalized
> levels.
>
> Then install the parasitic element and sweep the frequencies again and that
> will tell you what frequency maximum gain occurs.
>
> Adjust the length of the parasitic element to place maximum gain at your
> desired operating frequency.
>
> Allow about a weeks time for optimizing your array.
>
> Been there, done that.
>
> de Paul, W8AEF


I suppose a similar scheme would work if you wanted to optimize F/B. 
put the probe system behind the antenna, and adjust for minimum.