[amsat-bb] Re: metal or non metal cross booms
kc6uqh at cox.net
Sun Apr 6 10:04:51 PDT 2008
Wood has very good strength, why not place a wood dowel rod inside a pvc
pipe with end caps to keep the weather out?
THe wood will offer the support and the pvc will protect the wood from the
----- Original Message -----
From: "Prathap Kumar" <vu2pop at gmail.com>
To: <amsat-bb at amsat.org>
Sent: Sunday, April 06, 2008 7:44 AM
Subject: [amsat-bb] Re: metal or non metal cross booms
> I got the thick wall Blue PVC pipes used for plumbing wrapped in
> mat and its been in use for over ten years now.
> The final OD is now about 40mm.
> It does support both my cross yagis on the rotator.
> I am also looking for the fibreglass tube with thick wall and hope to get
> some here in Bangalore and will keep you informed Gopal.
> Best 73
>> A good decision that you made. A study by Kent, WA5VJB, shows that
>> only some sensitivity of position between elements on the antenna
>> boom impacts using a metal crossboom if the antenna is mounted in the
>> "X" confinguration. My satellite antennas are mounted this way.
>> 73 Ed - KL7UW
>> At 05:50 PM 4/5/2008, Gopal Madhavan wrote:
>>>I have experimented with both non-metallic and metallic cross booms after
>>>reading numerous articles on the subject some years ago. With CP antennae
>>>mounted in X configuration there seems to be hardly any difference in
>>>performance. I speak of experiments done when AO-40 was active.
>>>I now use a metallic boom as it gives very good rigidity to mount two CP
>>>antennae, a small dish for 2.4 GHz, preamps etc. Here in India I do not
>>>the option to order a good section of fibre glass cross boom any way, and
>>>had made do with PVC tube wrapped in fibre glass, but it eventually
>>>and I had to periodically rotate it 180 degrees to keep it somewhat
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