Bill,

The KPA1500 is similar to the KPA500 in that regard, except that you cannot access the connection between the PA and the tuner.


Connect the TX monitor in line with the antenna. It will show the unmatched SWR and power to the antenna (the SWR will not change with the tuner settings), but serves as a monitor on any changes (faults) happening in your antenna system. If the SWR changes, there is a problem with your antenna.

With the KPA500 and KAT500, you could place the monitor between the KPA500 and the KAT500 and see the SWR that the KAT500 has provided - but that information is also available on the KAT500 LEDs. With the TX Monitor placed between the KPA1500 ANT output and the antenna, the thing to monitor is *changes* in the SWR (not for an SWR of 1-1). A change in SWR of the antenna indicates something has changed in your antenna system.

The LEDs on the KPA1500 will indicate the SWR match achieved by the ATU, and can be believed - no need to duplicate that SWR on the TX Monitor.

73,
Don W3FPR

On 2/19/2018 8:38 PM, Bill Wiehe via Elecraft wrote:
I have been looking over the on-line manual and I unable to find any reference 
that explains how one will connect the P3TXMon Option Coupler to KPA1500 in 
order to measure power and swr. Does anyone have any insight.
Thanks,Bill - W0BBI
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