[Tower-Speak] Re: [Antennas] home-made tower questions

[Dave Shrader]

I've used the Yaesu G-800SA for two years with a fifty pound eight
element Log Periodic antenna, Tennedyne T8, in a moderate to high wind
environment. We quite often get sustained storm winds in excess of sixty
mph [100kph].

I use a thrust bearing to minimize vertical load on the rotator.

Maximum wind loading [twisting] torque is about one half of specified
maximum with the T8.

You have to make some calculations based on vertical load and wind load
for the antennas you will be using.

My guess is that the G800SA will be fine but you calculate your loafs
for the antennas you want to use.

Dave, W1MCE

Zoltan Bordas wrote:
> 
> Hello,
> 
> I am considering to erect a "home-made" 16m aluminium self-standing tower.
> It is planned for a Force12 C4 (maybe only C3) yagi for HF, a 4 element yagi
> for 6m and a 5...9 element yagi for 2m.
> The tower will be designed and made by a local company manufacturing
> aluminium ladders, and will consist of 4 sections of about 4m. As my
> backyard is very small and no crane can enter, the sections will be mounted
> manually (maybe with a gin-pole) - this is why I have chosen the aluminium,
> as is much more lighter then the steel.
> 
> My questions are:
> - what is the suitable rotor for this application (manufacturer/model)? I
> was considering the Yaesu G-800 DXA, but is this powerful enough, or are
> there better/cheaper solutions? My area is not very windy, except sometimes
> in the summer with short winds up to 100km/h (well, exceptions may
> occur...).
> - As I do not own the money for the tower + rotor + one yagi at least, I'd
> like first to erect the tower and use it for wire antennas support until the
> whole construction will be finished. Depending (or not?) of the rotor type,
> what is the suitable mounting plate configuration and drillings to be
> manufactured in order to be suitable later for the mounting of the rotor? Is
> a drawing or plan available on the internet?
> - What are the minimal dimensions for the tower-base for this construction?
> Soil is not rocky, little bit loamy.
> - Can I use also aluminium (alloy, as the legs of the tower) for the mast,
> or only steel?
> 
> Thanks for any advice!
> 
> 73 de Zoli / YO5CRQ
> 
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