Hi Jim,
My drive motors usually are 3-phase 400V, so I have no problem to use
automated ramping with a cycle inverter now.
But first I need to add an additional position indicator to supply
information to my electronic for that reason and to add point and shoot
features.
At present I only drive a selsyn together with the limit switches.
http://ic2.pbase.com/g4/91/283791/2/64082622.IWWhlXiA.jpg
http://ic2.pbase.com/g4/91/283791/2/64082562.ehwDr8mw.jpg
http://ic2.pbase.com/g6/91/283791/2/68997594.xSfo0AWi.jpg
73
Peter, DJ7WW
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Jim Thomson
Sent: Freitag, 3. September 2010 13:47
To: towertalk@contesting.com
Subject: [TowerTalk] Antenna Rotor Speed
Date: Thu, 2 Sep 2010 20:10:38 +0200
From: "DF3KV" <df3kv@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
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|
