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

[Wayne Burdick]

This is definitely doable from the amp. All it takes is an external antenna switch with a control port compatible with RS232, Ethernet, USB, or one of the amp’s multi-purpose digital output lines. (These have other uses, too, such as SWR alarm output.)

To select among antennas from the amp, you could do any of the following:

- tap the ANT switch to go between two or more antennas in rotation

- tap ANT then use the UP/DN switches

- assign two frequently-used antennas to the front-panel PF1 and PF2 switches

In all cases, the LCD would show your selection from among N external antenna jacks.

We can adapt the firmware to handle any such scenario.

Wayne
N6KR


> On Jan 25, 2018, at 7:58 PM, K9MA <k9ma at sdellington.us> wrote:
> 
> I'm concerned about the same issue:  Multiple antennas on one band. I have an automated antenna selection system.  In addition to following the band data from the transceiver, there are switches to select antennas.  I frequently have to very quickly switch antennas, so it must involve only a single switch.  Using a mouse with the computer is nowhere near fast enough and I really don't want to make it dependent on the computer, anyhway.  However, my antennas have different impedances, so require different ATU settings.  So, how can I tie the KPA1500 ATU into my antenna control switch so it automatically switches settings?  All the antenna switching is external to the amp, so only a single amp output is used.  The ideal would be a control line to the amp, controlled by the same switch that selects antennas, which would select ATU settings.  I really don't want to make it dependent on the computer.  I expect others have the same issue.  Can the KPA1500 be made to do something like this?
> 
> 73,
> Scott K9MA
> 
> -- 
> Scott  K9MA
> 
> k9ma at sdellington.us
> 
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