of course a big thanks to K6TU for a great effort
I will need to compare like you Bill
Certainly from my location the data is not as acurate
73,
Jorge
2015-03-10 11:05 GMT-03:00 Bill via TowerTalk <towertalk@contesting.com>:
> In modeling at a possible new location I used Google Earth for one
> direction (north) and then compared it to K6TU's files...pretty close.
> And, the
> graphs produced were also looked pretty similar.
>
> By the way, a tip of the hat to K6TU for making it so easy to obtain the
> necessary input data to run the HFTA program. Thank you!
>
>
>
> K4XS
>
>
> In a message dated 3/10/2015 1:45:40 P.M. Coordinated Universal Time,
> cx6vm.jorge@gmail.com writes:
>
> 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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--
73,
Jorge
CX6VM/CW5W
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