[TowerTalk] Comments on Sidemounting Antenna, Please

[K7LXC@aol.com]

In a message dated 06/13/2000 6:24:13 AM Pacific Daylight Time, w4foa@voy.net 
writes:

> I am planning to "side mount" a TA-36 (pre CL-36) on my
>  75 foot Rohn 25 tower.  Want to put it at approximately the
>  45 foot level, fixed on Europe.

     Great idea. It'll give you additional flexibility for higher arrival 
angles at that heading. 

>  This is my first experience with sidemounting and would welcome
>  the suggestions, ideas, "do's and dont's" from this most knowledgeable
>  group.  Should I mount it directly to a tower leg?  

    Walker County is a 75 MPH windspeed zone and this is a relatively small 
antenna  but you should consider spreading the wind stress over two legs 
instead of just one. If a tower face is parallel to your desired heading, you 
can just use a plate U-bolted to the legs for the boom-to-tower mounting.

>  I think Rohn has a sidemount fixture for Rohn 25 and
>  if so, should I only use that device? 

     The Rohn sidemounts are designed for standing-off omnidirectional 
antennas in the VHF and up range (also small yagis and dishes) so that the 
antennas are 2-3 feet away from the tower. You can fabricate one yourself 
with some angle steel or aluminum, a pipe and a bunch of U-bolts. This is 
helpful if you need to point your antenna in a direction that you can't get 
by mounting it on a face. 

Cheers,   Steve   K7LXC
Tower Tech 

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