If HiSWR AUTOTUNE is enabled, this would be the expected behavior.
However, ATU switching at the start of transmission sometimes happens
even with it disabled.
Elecraft is working on the ATU firmware in relation to this issue. I
noticed it some time ago. Even with the HiSWR AUTOTUNE turned off and
AUXBUS frequency data from the K3, the ATU sometimes switches when
transmission starts. I don't know quite what it sounds like on the other
end, but I seem to get asked for repeats off when it happens. Although
the K3 sends frequency data to the KPA1500 only once per second, that
isn't the main problem, as the switching occurs even if tuning has
stopped for longer than that.
Stay tuned.
73,
Scott K9MA
On 2/21/2019 09:36, Jim Miller wrote:
Things to check
Could be bad aux cable. Is it from Elecraft?
Do you have anything else connected to aux?
Are you sure connectors are fully engaged?
On Feb 21, 2019, at 10:21 AM, Walter J. Legowski <sue.w...@dososaur.com> wrote:
I experienced the same thing, especially on 20M. The tuner is apparently ignoring some of the
signals on the AUXBUS line. I put a scope on that line. I can see, some of the time, the
amplifier responding to the signal with a "clunk" as the tuner relays adjust to the new
segment. The rest of the time, I see the signal, but no response from the amp. If you attempt to
transmit when the signal is ignored, you get chattering relays followed by "ATU Retune
Complete" on the amp display. I took a photo of the signal trace and sent it to Support
yesterday. They haven't gotten back to me yet.
Walt, WA1KKM
On 2/21/19 3:36 AM, Peter Dougherty wrote:
Hi all,
Something I noticed this past weekend in the contest about the KPA1500,
especially on 80 and 160, where the internal tuner was needed on antennas
that were above ~1.5:1 SWR. When I changed frequencies into a range that
required retuning, I had to manually press the ATU control and initiate a
tune sequence, or else when I was auto-sending CW my call would get cut off
as the tuner set its needed values.
Since I'd memorized the entire band(s) ahead of time, is there a way for the
memorized tuning solutions to load on QSY, rather than on RF application? It
really slowed me down as I was S&Ping my way through the low bands on Friday
night.
---------------------------------------------
73 and Good DX
Peter, W2IRT
President, North Jersey DX Association
DXCC Card Checker
Letter O Manager, ARRL Incoming 2nd District QSL bureau
--
Scott K9MA
k...@sdellington.us
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