There´s a great difference from K6TU terrain files and files you can made
from Google Earth :-)
At least to my location
73,
Jorge
-----Mensaje original-----
De: TowerTalk [mailto:towertalk-bounces@contesting.com] En nombre de Pete
Smith N4ZR
Enviado el: lunes, 09 de marzo de 2015 12:56 p.m.
Para: towertalk@contesting.com
Asunto: Re: [TowerTalk] [Bulk] 80 mts four square or yagi?
A lot depends on what angles you need, from where you are. HFTA's Figure of
Merit can be useful here. K6TU.net now offers free online terrain profiling
for both US and non-US locations, the latter using SRTM data.
73, Pete N4ZR
Check out the Reverse Beacon Network at
http://reversebeacon.net,
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
ARC V6 or VE7CC DX cluster node.
On 3/8/2015 5:39 PM, Grant Saviers wrote:
> Any comparison has to be gain vs elevation angle. In my modeling 80m
> yagis & dipoles don't have sufficient low angle gain until they are up
> about 150'.
>
> A 2L 80m yagi at 150' models its gain peak as about 12dbi at 25deg and
> 3dbi at 5deg elevation.
>
> A 4sq over salt water yields about 9dbi from horizon to 25deg
> elevation. Obviously, best case, so modeling is needed for every
> design of radials and ground properties.
>
> Both are a significant investment so should be carefully modeled.
>
> Grant KZ1W
>
>
> On 3/8/2015 10:06 AM, Jorge Diez CX6VM wrote:
>> Hello
>>
>> Wish someone have some analysis or field test to compare a 4SQ with
>> sixty 1/4 WL radials each vertical and a 3 element wire yagi with
>> boom at 115ft
>>
>> Which one have more GAIN?
>>
>> Thanks
>> Jorge
>> CX6VM/CW5W
>>
>> Enviado desde mi iPhone
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