[TowerTalk] Rotor damage from Shunt Feeding your tower?

[Herbert Schoenbohm]

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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