[Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Don Wilhelm]

Ken,

I am not Wayne, but I can tell you that you question does not have a 
single answer.
Do you run an amplifier?  More power requires greater separation between 
the TX and the RX antennas.

Another factor is the orientation of the antennas.  An RX antenna in the 
null pattern of the TX antenna will not pick up a lot of TX RF, while an 
RX antenna broadside to the full TX antenna RF will be a problem.

If the antennas have orthogonal polarity (one horizontal and one 
vertical), that will reduce the pickup on the RX antenna during TX.

So a lot depends on the type of RX antenna, its orientation, its 
directivity, and a vast array of other factors.  There is no one answer 
to your question, it all depends on your installation.

73,
Don W3FPR

On 1/27/2015 5:53 PM, Ken wrote:
> Wayne,   can you please elaborate on what is sufficient antenna separation when a transmitter is operating on another antenna?   I ask this because my K3 returning from a trip to Elecraft after damaging the front end.   I assume it happened when I was testing an old boat anchor (Viking II, 100 watts) on an antenna 15’ feet away and parallel to the K3’s antenna.  How far is enough?  Yes, I realize that’s probably too close but at this point I am concerned.
>
> I know the K3 is popular in Field Day and DXpedition operation so obviously it can work, but I’d like some guidelines.
>
>