This feature works VERY well, with the occasional hiccup that the power
isn't lowered, causing a fault (rare, likely not enough time for the
signals to pass between the boxes).
I *DO* suggest that you also set up the amp input/output for *ALL*
bands, in particular the bands where the power limits are much lower
(60M for example, 100 watts ERP compared to a dipole) so if you fail to
recall as you change bands, you don't accidentally exceed limits with
the amp in operate mode.
Rick NHC
On 9/2/2019 7:36 AM, Jack Brindle via Elecraft wrote:
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<[email protected]> 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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