[Elecraft] KPA1500 ATU - ability to handle more than two antennas

[Bill Frantz]

My switch uses an Arduino to read the band lines from the K3 and 
select the last antenna(s) used on that band. It the code could 
easily be modified to tell an antenna tuner -- in the K3, an 
amp, or separate -- which antenna system is in use. Manual 
switching is with a button for each antenna.

73 Bill AE6JV

On 1/27/18 at 11:31 PM, k9ma at sdellington.us (K9MA) wrote:

>Another advantage of doing all the antenna switching external 
>to the amplifier is it allows using a single coax, which can 
>easily be disconnected when there's lightning about.

In my case, it minimizes the number of coax runs, which keeps my 
wife happy.


>My system, for example, has a toggle switch to select one of my 
>two tribanders.  I can switch back and forth several times in 
>a second when trying to determine which direction the signal is 
>coming from.  I can't possibly manipulate more than one switch 
>that fast, nor to I want to have to reach over to wherever the 
>amplifier happens to be, and I certainly don't want to be 
>messing around with a mouse.  (While all this antenna 
>switching is going on, the other hand is running the radio.)

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