[Elecraft] Elecraft] {K3} How to run Diversity mode [long]

[Dave]

With a K4D diversity operation is easier than it was with the K3, as you
can swap the auxiliary antenna between the main RX and 2nd RX with the
press of a button (no cable swapping in the case).

For many years I have used a simple active antenna alongside my main
antennas. By using a horizontal main antenna and a vertically polarised
active antenna, you can benefit from polarity diversity. This works well on
the lower bands.

Protection for both the active antenna and the receiver can be done by
turning off the dc supply to the active antenna while transmitting. A
single transistor switch connected to the linear keying phono socket is all
you need.

This page describes a simple 2 transistor active antenna and associated
interface:

https://www.qsl.net/g4aon/pa0rdt_aa/

73 Dave G4AON