Something like a Ham IV, for example, does not ramp nor does it coast all
that well. If you are turning an antenna with a long boom and/or elements
there can be a fair amount of torsion when starting or stopping. Without
something like the GA-3000 or the ramping the rotator and/or tower has to
handle the torsion. The GA-3000 presumably would ease the torsion effects on
the rotator and tower. A bigger rotator can help but it will most likely
just transfer the torsion directly to the tower. With the GA-3000 there
might be a tendency for wobble or oscillation under high wind situations as
Roger pointed out.
It has been a while since I read Leeson's book on this subject.
73, Larry W6NWS
-----Original Message-----
From: john@kk9a.com
Sent: Monday, January 14, 2013 7:17 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] any source for a GA-3000 ???
Green Heron Controllers do a very nice job of ramping!
John KK9A
To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] any source for a GA-3000 ???
From: "Larry" <lknain@nc.rr.com>
Date: Mon, 14 Jan 2013 04:56:20 -0500
It is probably most useful with large antennas/arrays unless you ramp up
and down the rotational speed.
73, Larry W6NWS
-----Original Message----- From: john@kk9a.com
Sent: Sunday, January 13, 2013 10:10 PM
To: TOWERTALK@contesting.com
Subject: Re: [TowerTalk] any source for a GA-3000 ???
I think it is unnecessary of you use a strong enough rotator.
To:<towertalk@contesting.com>
Subject:Re: [TowerTalk] any source for a GA-3000 ???
From:"Larry" <lknain@nc.rr.com>
Reply-to:Larry <w6nws@arrl.net>
Date:Sun, 13 Jan 2013 20:49:07 -0500
List-post:<towertalk@contesting.com">mailto:towertalk@contesting.com>
I think it roughly equivalent to Leeson's book recommendation except
that
Leeson used a BMW part. Or was it Lawson's book?
73, Larry W6NWS
_______________________________________________
_______________________________________________
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
|