[Towertalk] Side-Mount on Trylon T400-80?

[K7LXC@aol.com]

In a message dated 1/4/03 10:23:18 PM Pacific Standard Time, 
spelunk.sueno@prodigy.net writes:

>      Trylon's commercial web page lists such side-mounts:
>  http://www.trylon.com/lightdutytowers/selfsupporttwrs_accessories.asp#side 
.

    Well, yes and no. This illustrates a sidemount that is mounted on the 
face of the tower. It's okay for a fixed sidemounted yagi but I think Rich's 
question had to do with being able to rotate them.

    In order to rotate them, the sidemount needs to be installed so the 
sidemount/antenna is on the leg - not the face. Here's a drawing that 
illustrates the basic parameters - <A 
HREF="http://www.reprise.com/antronics/sidemount_clearance.asp">
http://www.reprise.com/antronics/sidemount_clearance.asp</A>. Without knowing 
how much clearance is required (since Rich didn't say at what altitude and 
thus how much tower face you need to deal with) for where he was going to 
install an antenna or how much between-element clearance he'll need to do any 
rotating, it's not easy to come up with a conclusive answer. I've heard of a 
'stretch' design for the C31XR that adds some needed clearance between 
elements but this dimension becomes the crux parameter for any sidemounted 
yagi. 

    It's easy to fabricate a sidemount and swinging-gate for any tower 
including the Trylon Titan - you just need some angle steel or aluminum, some 
pipe, and some U-bolts. 

    A good way to see what you need is to draw the proposed installation on 
some graph paper.

Cheers,
Steve     K7LXC
TOWER TECH -
Professional tower services for commercial and amateur