I believe it’s 3 HF. But you must have the ATU and maybe the second ADC ( K4D). 

Regular K4 has one TX port.  




Sent from my iPhone
...nr4c. bill


> On May 15, 2020, at 3:01 PM, Paul Gacek via Elecraft 
> <elecraft@mailman.qth.net> wrote:
> 
> I think I’ve read that the K4 will have 3 TX antenna ports and possibly up 
> to 5 RX antenna ports.
> 
> Does anyone know if the 3 TX can all be used for HF bands concurrently?
> 
> The use case is very straightforward and is;
> 1) tri bander 10/15/20
> 2) 40m antenna
> 3) 80m antenna
> 
> I just want to make sure I understand the it’s 3 HF TX ports and not just 2 
> HF TX and 1 VHF (2m) TX.
> 
> Paul
> W6PNG/M0SNA 
> www.nomadic.blog
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