[TowerTalk] homebrew rotator

[Jim Thomson]

Date: Fri, 3 Jun 2016 01:41:49 -0400
From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk at tm.net>
To: towertalk at contesting.com
Subject: Re: [TowerTalk] homebrew rotator

Yes it kinda does <LOL>

73

Roger (K8RI)

##  You could probably use one of the many gear redux boxes available... like the hub city brand.
They all come with a single  worm drive built into them..and also available in double  worm drive.
They can be ordered in almost any gear ratio you want.  That is what is used to  raise / lower the 
5000 lb  HDX-689  tower.   ( ok the bottom section sits on the concrete,  so 4000 lbs  +  600 lbs of ant /mast
etc, being lifted /lowered). 

##     The 1700  rpm   1  to 1.5 hp  motor has a 14 inch diam  pulley on its 
shaft.   Then down to just 2 inch pulley on the gear box input shaft.  Rubber belt between em is easily turned by hand. 
Output shaft of the gear box has a 3 inch sprocket on it.    Then a 6 inch sprocket on the big drum. 
Double wide chain between the 3 + 6 inch sprocket.   Shut the power off...or remove rubber belt..and it doesnt budge. 

##  for a rotor, that felllow in eu uses...  what appears to be a speed reduction box, which appears to be direct  driven
by the motor...with just a simple coupler..like a U joint type.  

##   115  /  230 vac motors  work superb.   They are reversible, and have capacitor start and run.   Can be had in any hp
value you want, like  down to real small values.   Then u dont have to worry about V drops.   115 /230 motors  work
superb when used with 120 /240 vac  + long lines... like at the top of a tower. 

##  In the case of the crank up, there is a 14:1  redux between  motor and input of gear box.... then the gear boxes own redux,
then a further  2: 1 redux  with the chain on the  3 + 6 inch sprockets. 

##  draw it out on paper, and its readily doable..esp when a double worm gear  version of a gear box is used.  What u end up
with is..  virtually identical to the rotor that telrex sold. 

##  For a plug and play solution... use a small /med /large version of the K7NV Prop pitch, with the 3 inch mast clamp option,
and the mating GH control box.   there is also an option to locate just the power supply portion of the GH   in its own water proof box,
at the base of the tower  ( with main GH  control box in shack).... to eliminate V drops on long runs.   The external power supply can also
be located towards the top of the tower....and then  120 /240  fed to top of tower.   

Jim   VE7RF