[Elecraft] KPA500 STBY to OPER

[Jack Brindle]

Andy;

It works very well. The op has to set the K3 so that the power is controller per-band. When the KPA is switched to OPmode, it sends a message to the K3. The K3 then switches to the amplifier selection for power, which the op has et specifically for the KPA. The converse is also true, switching the KPA to STBY also sends a message that causes the K3 to realize the KPA’s state and move back to its main power setting for the band.

Note that the power level is set for each band for both normal and KPA drive  levels. This is well documented in the KPA manual and also in the K3 manual(s).

73!
Jack, W6FB


> On Sep 2, 2019, at 6:58 AM, Andy Durbin <a.durbin at msn.com> wrote:
> 
> "With my K3S, when I switch the KPA500 to Operate, the transceiver is automatically reduced to the correct power to drive the amp."
> 
> Bob,
> 
> I'm curious to know how well that feature works.  Let's say your KPA500 is STBY, your K3 is set to 100 W out, and you are transmitting in a digital mode.  What happens when you switch the KPA500 to OPER?
> 
> If you don't know the answer please don't it!
> 
> My  controller ensures that the KAT500 key line is inhibited when the KPA500 is in STBY.  When the KPA500 goes to OPER I set appropriate exciter power, and only when correct power has been verified do I enable the key line.  If I'm transmitting at 100W with KPA500 in STBY then selecting OPER gives a brief power reduction before establishing high power output.
> 
> 73,
> Andy k3wyc
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