Hi Paul,

> I think I’ve read that the K4 will have 3 TX antenna ports and possibly up to 
> 5 RX antenna ports.

The KAT4 ATU provides three SO-239 antenna jacks. Any of the three antennas can 
be selected for transmit. By extension, this becomes the default antenna for 
the receivers, unless you choose a different receive antenna. ATU LC settings 
for all three antennas are stored on a per-band basis, and each band can have 
up to 32 different stored segments.

There are two receive antenna inputs, RX ANT in 1 and RX ANT in 2.

In addition, either of the two KAT4 antennas *not* currently being used for 
transmit can be used as a receive antenna.

In summary, each receiver has access to any of five antennas:

- KAT4 ANT 1/2/3, either by sharing the TX antenna or by using one of the KAT4 
non-transmit antennas

- RX ANT IN 1 and 2

For internal transverters, there's a fourth SO-239 (or an N connector). This 
jack would be shared between two more transverter bands if applicable.

73,
Wayne
N6KR



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