The Green Heron controller has TVS diodes across all of the rotator lines
except the brake and start capacitor lines. I suspect they would blow (68 V
and 15 V) long before the MOV's. The TVS diodes saved my RT-21 controller
(they all blew) after a near field lightning hit. I have surge arrestors on
all coax and control lines coming down the tower installed within a single
point ground system at the base of the tower.
Ken K5RG
------------------------------
Message: 7
Date: Wed, 20 Nov 2013 15:20:42 -0500
From: "Mark Robinson" <markrob@mindspring.com>
To: "Ray Benny" <rayn6vr@cableone.net>, "TowerTalk"
<TowerTalk@contesting.com>
Subject: Re: [TowerTalk] Wire grounding question
Message-ID: <5D54F92A4D2E4D69A90AF5CDDB446DA7@hplaptop>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I have a Green Heron controller driving an M2 rotator. It uses a magnetic
pulse encoder.
I had a red and blue wire inside a foil shield with a drain wire inside. I
grounded the drain wire and I also grounded the blue wire. I did this at the
top of the tower, at the bottom of the tower and where the cable enters my
shack.
I connected MOV's between the grounded blue wire and the red wire at the
base of the tower and where the cable enters my shack. I have had no issues
with this set up
Mark N1UK
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