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Re: Re: Cross boom length?, (Metal Cross Boom)



Ooo!  One of my favorite topics.

I do not mean to dis-respect William, who is one cool dude!

When it is actually measured it turns out metal is just fine if you do it 
right.  Metal is cheaper and stronger as well.  Check out what happens when 
someone actually measured the results at:

http://www.g6lvb.com/fibermetalboom.htm

Antenna guru Kent Britain, WA5VJB has done the leg work for us on this.

73,
Joe
kk0sd

----- Original Message ----- 
From: "William Leijenaar" <pe1rah@yahoo.com>
To: <amsat-bb@amsat.org>
Sent: Monday, March 20, 2006 12:50 AM
Subject: [amsat-bb] Re: Cross boom length?,


> Hi AMSATs,
>
> Just some small idea for avoiding metal elevation pipe
> through your circular antennas that make them no more
> circular...
>
> You must use none-metal materials, well known is the
> fiberglass, but also expensive and difficult to get
> (or transport).
>
> What I have done is I bought two types of PVC (water)
> pipes. In the smallest one I put some wooden broom
> sticks to make it not bend. This one I finally but
> into the bigger PVC pipe and all together it makes a
> quit strong elevation mast.
>
> It is not enough for a huge antenna park, but for my
> 20el 2m x-yagi, 32el. 70cm x-yagi and 60cm 2,4GHz Dish
> it work for more than 5 years now...
>
> Also take care off your coaxial cables going through
> your radiation pattern. Exit the cables at the rear of
> your yagis, with a wide lobe to your vertical mast
> (rotor).
>
> Just some ideas...
> Now I go to work :o)
>
> William Leijenaar
> ---
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