[VHFcontesting] Log Periodic ?

[Zack Widup]

I think if you're close to a metropolitan area with a lot of people to
work who are close by, the log periodic is the way to go. Some of the
Rovers in the Chicago area I know use LPDA's. My favorite portable
location is about 100 miles from the closest stations I work. I have
found it's advantageous to use a separate, larger beam with more gain
for each band.

73, Zack W9SZ


On Thu, Sep 14, 2017 at 7:45 AM, Patrick Thomas <p-thomas at mindspring.com> wrote:
> Like all things in contesting, I think it depends on one's goals and circumstances.  Sure, an LPDA will not perform as well as long (maybe even mid-length) yagis.  But... it also will cost less, take up less space in the vehicle, take up less space/weight on the mast, take less time to set up (assuming you start from scratch), and will only require one run of heavy coax.  Plus obviously AN antenna will outperform NO antenna!  And as others have mentioned, you can use it for a backup "any band that failed" antenna in the future, if you later graduate to a higher-performing setup.
>
> Cheap surplus coax switches of good quality show up fairly often on ebay that can handle frequencies up to 1-2 GHz at a couple hundred watts, switching between 6-10 connectors, and these are easily controlled by anything from an automated arduino to a pushbutton control panel, so I would not be turned off by the need for a switch.
>
> Just my thoughts on the matter.  I considered building my own LPDA as there are many good calculators out there, but ended up with a large van for a rove vehicle, which will happily swallow many large antennas.  Now if it would just run reliably....
>
> Patrick
> KB8DGC
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