Tom,
I'm going to go out on a limb here, but hey,
it's only a virtual limb!
I am going to withdraw my previous statement
that the K3 SWR bridge is operating correctly.
Given what you've said, the ATU control algorithm
is receiving bad information from the SWR bridge.
Here's how to test this
The KAT3, KAT500, KPA1500 tuners, all have the same feature. I have all
three.
If you want a finer (lower SWR) value, within a few seconds of the first
tuning cycle stopping, start the sequence a second time and the tuner
will cycle through ALL possible settings to attempt a lower match. It
Aye, Tom - you've given us a good puzzle
to solve!
Back to looking at the schematics, possibly
opening up my K3 to do direct visual inspection.
What, if any, options do you have installed
in your K3 (including KPA3 100 watt PA)?
73,
Mike, K8CN
The KAT500 will enter a fine-tune mode if you re-initiate a tune cycle
right after the first one has finished. I don't know if the KAT3 will
do that, and I can't test it because mine always finds the primary match
the first time, but Elecraft would have a lot of incentive to reuse KAT3
Sounds like you are in need of a choke somewhere or a grounding issue.
David G3UNA
> On 07 December 2021 at 13:26 Tom Boucher wrote:
>
> Tom
>
> I've found that pressing tune again, immediately after a tune sequence
> sets it off to do "fine tuning" which might help.
>
> David
*TomI've found that pressing tune again, immediately after a tune sequence
sets it off to do "fine tuning" which might help.David G3UNA*
Thanks David - yes I've tried that, but it still ends up with a poor
indicated SWR. Also cleaned up and tightened the screwed pillar in the KAT3
corner,
You can set TUN PWR in the K3 Config Menu to something other than 5 watts.
73,
Drew
AF2Z
On 12/07/21 06:59, Tom Boucher wrote:
Thanks NK7Z, NK7I and K8CN for responses.
Dave and Rick indicated that running the K3 at a higher power level during
the ATU Tune sequence might solve the problem
Tom
I've found that pressing tune again, immediately after a tune sequence sets it
off to do "fine tuning" which might help.
David G3UNA
> On 07 December 2021 at 11:59 Tom Boucher wrote:
>
>
> Thanks NK7Z, NK7I and K8CN for responses.
>
> Dave and Rick indicated that running the K3 at a
Thanks NK7Z, NK7I and K8CN for responses.
Dave and Rick indicated that running the K3 at a higher power level during
the ATU Tune sequence might solve the problem however, as far as I can see,
the power level is fixed at 5 watts during auto tune and cannot be altered.
Mike, there is no problem
Tom,
Does the problem you describe occur
on each of the ANT1 and ANT2 ports
on the KAT3 output when the ports
are terminated in a good 50 ohm power
load?
Have you checked the K3 ANT selection
when the KAT3 is installed to be sure that
the port to which your 50 ohm load is
attached is the one
The KAT3 performs well at 10 watts, lower output levels may not get
consistent results.
Ditto the KAT500 and KPA1500 tuners.
73,
Rick NK7I
On 12/4/2021 8:58 AM, Dave wrote:
Hi Tom,
In your initial post, you failed to state the power level of your
failed autotune event.
Hence why my
Hi Tom,
In your initial post, you failed to state the power level of your failed
autotune event.
Hence why my question did not ask what the tuning level needed for the
K3 to trigger was, but at what power level you were performing your
failed autotuning event at.
My thinking was that you
Dave (NK7Z),
The K3 performs its auto-tune sequence at a power output of 5 watts I
believe.
73,
Tom G3OLB
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Post:
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
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,
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