[TowerTalk] Re:
n4kg@juno.com
n4kg@juno.com
Wed, 1 Mar 2000 23:31:20 -0600
Do you have the W2PV Yagi Antenna Design Book?
If so, compare the plots of 4L and 6L Yagi's on a .75 WL boom.
You will notice the very narrow bandwidth of the gain curve
with only 4 elements. I would expect the SWR bandwidth
to also be more narrow. Coupling is "light" and everything
seems more critical with widespaced 4L designs.
5 elements on a .75 WL boom makes for a very nice design.
You can pick up another 0.5 dB of gain going to 6L on a .8 WL
boom.
Most commercial antennas seem to have 1 more element than
needed for the boom gain. I suspect the reason is better
bandwidth and a more forgiving design.
In the maximum bang for the buck department, a 3L Yagi on
a 0.35 WL boom is hard to beat. (Remember Telrex?)
de Tom N4KG
On Wed, 1 Mar 2000 18:24:37 -0600 "Tom Hellem" <redpines@cybrzn.com>
writes:
>
> Here's another one for the yagi guys:
> Is there any advantage to putting more than 4 elements on a .75
> wavelength
> boom? It appears that the difference in gain and f/b is minimal when
> going
> from 4 up to 6 elements.
>
> K0SN
________________________________________________________________
YOU'RE PAYING TOO MUCH FOR THE INTERNET!
Juno now offers FREE Internet Access!
Try it today - there's no risk! For your FREE software, visit:
http://dl.www.juno.com/get/tagj.
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm