I'll second Jack's observation Bruce. "Most" of the time, the K3
switches power levels properly ... but, the key lies in Jack's
description of how it works. The K3 gets notice of "events" from the
KPA which treats the notices as "fire and forget." The event causes the
K3 to take some action(s) and go to some state. It seems to be great at
that. It also needs to remember that state [conceptually, "KPA in
standby"] regardless of what goes on thereafter. It seems there are
things you can do after putting the KPA in off or standby that foul up
this state memory. With a background in aircraft systems for the
military, the peripheral fire and forget mode is a non-starter for me.
I just developed the habit of always checking the K3 PWR OUT setting
before transmitting.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 10/20/2020 3:08 PM, Jack Brindle via Elecraft wrote:
Bruce;
Did you ever resolve the issue?
The KPA500 and KPA1500 send events to the K3, not commands. The distinction is
important - an event simply reports a state change in the amplifier. It is up
to the K3 to decide what to do in response, if anything.
Thus when tapping a and button the KPA simply sends an event indicate that the
button had been tapped, the K3 receives that and decides to do a band switch
(if needed).
The fact that the K3 is indicating a response (in the VFO B display) says the
K3 is indeed receiving the event properly. That means the KPA1500 is working
properly, so the issue is in the K3.
Since the K3 sets the correct power for the KPA OP mode, it should be expected
the the K3 is also selecting the high power setting when the KPA indicates that
it is in STBY mode. The is the same power level that would be used if the K3 is
powered up with the KPA left turned off. From personal experience I have many
times found the power not to be what I expected after some special operating
activity, like Field Day where we run just 5 watts. Turning the Power knob
usually fixes the problem quite nicely.
73!
Jack, W6FB
Elecraft Engineering
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