K3 ATU problem

[Eric Rosenberg]

When I tap ATU TUNE, I hear the relays clicking, see no output from the
radio.  The op right corner of the screen shows  "--"

When I then transit, it appears that the SWR hasn't changed... the tuner
hasn't actually done anything,

Is there a way to troubleshoot this?

Thanks & 73,
Eric W3DQ
Washington, DC
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[k6dgw]

First thought, is your ATU is in bypass?  Is the "ATU" icon showing
below the 4th digit of VFO A display?

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 1/13/2021 6:43 AM, Eric Rosenberg wrote:

> When I tap ATU TUNE, I hear the relays clicking, see no output from
> the radio.  The op right corner of the screen shows  "--"
>
> When I then transit, it appears that the SWR hasn't changed... the
> tuner hasn't actually done anything,
>
> Is there a way to troubleshoot this?
>
> Thanks & 73,
> Eric W3DQ
> Washington, DC

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[KeithWE6R]

If an ATU tune finishes like that, with --, then it did not find a
match! (and will be in a random state).
You don't have enough power for a successful Tune.
Try running the TX gain calibration with the K3 Utility.

Or, with a dummy load, ATU in BYP, make sure TUN PWR is at "nor", then
set pwr to 5.0 watts exactly and long press XMIT to send a carrier for
several seconds. (That will do a manual tx gain cal on that freq).

Then engage ATU and do an ATU TUNE and it should find a match.
If the TX gain cal fails, something is wrong with the LPA.
Keith WE6R Elecraft Tech.
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