[Elecraft] KPA500 / KAT500 and W2 watt meter question

[Jack Brindle]

If you use the key-line interrupter, then you must use the phono-plug cables to connect the K3, KPA and KAT. Otherwise PTT will not get to the amplifier.
Of course using both without the key line interrupter is very redundant. You just don’t want to use both if an external device is included.

73,
Jack, W6FB


> On Oct 12, 2023, at 11:35 AM, Andy Durbin <a.durbin at msn.com> wrote:
> 
> SteppIR will accept up to 200 W without damage and opening the amplifier key line is the standard way protect SteppIR antennas.
> 
> It has been asserted that "NO key line interrupter is needed".  However, Elecraft recognizes that they may be such a need and sells an adapter to disable keying by AUX cable.  The description even mentions including the W2 is the protection system.
> 
> https://ftp.elecraft.com/KPA/Manuals%20Downloads/E740160%20-%20KPAK3AUX%20Cable%20Set%20Instructions%20Rev%201E.pdf
> 
> Andy, k3wyc
> 
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