[TowerTalk] Antenna Rotor Speed

[Jim Thomson]

Date: Thu, 2 Sep 2010 20:10:38 +0200
From: "DF3KV" <df3kv at t-online.de>
Subject: Re: [TowerTalk] Antenna Rotor Speed


I found 40 seconds for one rotation real nice for contesting after I built
my own rotator.
I turned a christmas tree of 5 element yagis 20-10m + 3L FS on 40m without
problems, but the stress on the double worm gearbox is quite heavy.
I used finally a 50mm drive shaft to flange to the rotating mast, 25mm
sheared off immediately the first time the rotation stopped.
On my present installation with slew ring drive it takes 90 seconds to
travel 360? which I find a bit too slow.
Higher speeds are no problem for antennas built to survive storms.

73
Peter, DJ7WW

##  PWM is cheap.   I bought a small  pre-assembled  PWM on a PC
board... and it's rated for a max of 30 Vdc  @  50 A  CCS.   The pot on 
the board is removed... and replaced with 1-3 pots..and a switch.  Then you
can  switch from slo-med-fast.... and back down again. 

## The GH box is superb.. with it's  ramp up/down  and point
and shoot feature. 

later... Jim  VE7RF