[Elecraft] K3 Auto ATU Problem

[Dave]

How much power are you using to trigger a tune operation?

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 12/2/21 09:08, Tom Boucher wrote:
> I'm wondering if someone can help with a KAT3 ATU problem on my K3
> S/No.01434?
> 
> When bypassed, the K3 SWR indication agrees with that on an external SWR
> meter. This is also so when the KAT3 is replaced with a KANT3 board. When
> in AUTO mode it goes through its relay rattling sequence for each band, but
> ends up with a mis-match as indicated by the K3 meter.
> 
> For example, with a 50 ohm load, in BYPASS the K3 indicates 1.0:1 SWR on
> all bands as it should. When in AUTO mode the indicated SWR is anything up
> to 4.4:1.
> 
> I have tried a different KAT3 with the same results. I have also re-loaded
> the firmware (version 05.67/2.88/2.88/1.26).
> 
> Thanks in advance.
> 73
> Tom G3OLB
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