[Elecraft] KPA-1500 tuner question

[Jim Miller]

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.walt at 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
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