[TowerTalk] rotating tower or stack : rpm

[StellarCAT]

Richard,

I have a 147' R55 rotating tower with 5 monobanders for 15 - 40 as well as a 
rotary 80 meter dipole at the top. I had concerns about momentum but have to 
say it really hasn't proved to be a problem. I am using the standard 1HP DC 
motor that comes with the K0XG system - along with a standard contactor 
switch box driven by a GH/K0XG controller. I had considered going with a DC 
drive for this arrangment - they're available on line for less than $100 for 
this HP rating and voltage and would provide complete ramp up and down times 
(adjustable). But now feel it isn't necessary.

Gary
K9RX

-----Original Message----- 
From: Richard Riley
Sent: Wednesday, October 4, 2017 12:54 PM
To: 'towertalk at contesting.com'
Subject: [TowerTalk] rotating tower or stack : rpm

Hi guys,

my previous post (reference soft-start and frequency regulation of motor on 
a rotating tower) drew no responses :( :(...
...so I'll try it from another angle.  I'm about to erect 102ft of 20inch- 
to- a-side, triangular rotating tower (loaded with 12-15m boomed monobanders 
from 40-10) on a 3 phase motor, with a projected speed of 1rpm..and am 
concerned about the potential for start/stop stress.

You have a large stack or a rotating tower.

How fast does it rotate?

Have you employed a soft-start-stop system to prevent mechanical shock?

If so, what did you choose?

Your input appreciated!

73 9a1tt

Richard Riley

mob: +385(0)993 994 995
direct: +385(0)1 5494 303


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