(meteorobs) Thomas -3 element 220 yagi

[stange]

Verticale arrays should definitely be avoided. Horizontal polarization only 
for additional reasons cited below besides just good looks....

I would stay away from any "plumbers delight" antenna design and make all 
elements insulated from the boom. That way he can avoid side pick-up better 
if he decides to null out the transmitters location too.

Plumbers delight designs are the easiest and most popular for Hams to make 
however..... Right now Thomas probably wants to insure the radar station 
will work before he gets into too many $$$ with amp's & exotic ant. systems.

I believe the 3 element Yagi's are all probably "plumbers delight" in design 
and this type of antenna can be built in a garage with standard tools just 
to get something going for testing purposes. Many construction designs are 
on the internet with specifications.

YCSentinel


----- Original Message ----- 
From: "Pat Branch" <pat_branch at yahoo.com>
To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
Sent: 2009/01/23 20:23
Subject: Re: (meteorobs) Thomas -3 element 220 yagi


> Personally I think you would want to go with an antenna specifically
> designed for only the 215-220 range. Extremely high gain and highly
> directional. I would point it toward an area about 100km over Mineral
> Wells TX. Instead of a vertical antenna I would go with a long
> horizontal element with a parabolic or corner reflector around it (like
> a horse trough). I would include a high gain amplifier (it does not
> even have to be low noise). You don't care about the mutipath
> reflections, just the amount of power you can get down the wire.
>
> I don't know much about the ham radio world, but I suspect if you
> cannot buy one you could build one. Maybe I can get one of my antenna
> design experts to give me an easy one...
>
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