[TowerTalk] Log Periodic Choice
jimlux at earthlink.net
Fri Sep 12 09:16:39 EDT 2008
Edward Sylvester wrote:
> Get a Steppir!
> --- On Thu, 9/11/08, WA6RKN <WA6RKN at ARRL.net> wrote:
> From: WA6RKN <WA6RKN at ARRL.net>
> Subject: Re: [TowerTalk] Log Periodic Choice
> To: "Tower Talk" <towertalk at contesting.com>
> Date: Thursday, September 11, 2008, 6:40 PM
> All this talk of Log Periodics.....I have a simple L.P. for 2
> meter/440....works quite well..
> But..on 10, 12, 15, 17, 20 meters, etc........
> What advantage (or disadvantage) is there to a Log Periodic when compared to
> a Yagi?
For the same physical size, covering the same bands:
The LPDA will be heavier (more elements)
The LPDA will probably have slightly less gain than an optimized 3
The LPDA might have lower front/rear ratio.
The LPDA has continuous coverage, as opposed to bands.
Compared to the SteppIR:
The LPDA can switch between frequencies in less than a microsecond, and
can do all frequencies at one time. If you are doing ALE or frequency
hopping among bands, the LPDA is the hot ticket.
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