Dick, There is not much to damage inside the Ham IV rotor itself as
the wire-wound direction slider can take most induced RF from shunt
feeding at normal amateur power levels. The indicator swing can be
eliminated by-passing the rotor control cable with at least 14 turns
through a ferrite ring, and putting some by pass capacitors on the
indicator terminals at the control box. Another way is to break the
control cable at the base of the tower, ground the rotor and ground the
common ground wire at the base of the tower. If that does not cure the
problem a couple of 2.5 mh RF chokes in series with the indicator
voltage wires at the base of the tower should help.
Herb Schoenbohm, KV4FZ
On 11/15/2014 11:39 PM, RLVZ--- via TowerTalk wrote:
Hi Guys,
Have any of you had damage to your rotor box due to high RF from Shunt
Feeding your tower or by suspending an Inv. L from your tower?
I get 10-20 degrees of meter movement on my Ham IV control box when shunt
feeding my tower or when using an Inv L.
Thanks & 73,
Dick- K9OM
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