SWR on 40M band

[Dragan 4O4A]

Hello all,

Well, I cannot say that it is a high SWR, but when I connect my K3 to dummy
load it shows 1.3:1 SWR on 40M. All other bands 160-10 are OK, 1:1. Other
rigs shows 1:1 on 40M.

Where to start to fix this?

Regards,
Dragan, 4O4A



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[Don Wilhelm]

Dragan,

Can I assume that you first tuned the KAT3 to the dummy load on 40 meters?

If you did not, then the L/C combination for the last antenna TUNE you
did are still present, and will show an SWR with a dummy load.

Actually 1.3:1 is quite a workable load on any band.  The SWR does not
have to be 1:1.  In fact there is a low SWR point where the ATU will not
attempt to tune.

See the K3 manual page 22 and the CONFIG:KAT3 menu (K3 manual page 56).
If you have the K3S, the manual pages may b a bit different.

73,
Don W3FPR

On 1/14/2019 7:24 PM, Dragan 4O4A wrote:
> Hello all,
>
> Well, I cannot say that it is a high SWR, but when I connect my K3 to dummy
> load it shows 1.3:1 SWR on 40M. All other bands 160-10 are OK, 1:1. Other
> rigs shows 1:1 on 40M.
>
> Where to start to fix this?
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[Dragan 4O4A]

Hi Don,
Thanks for prompt reply.

No KAT3 installed.
I'm aware that it is not a big deal, it's just annoying.
However, I would like to understand what caused it and how to fix it - if it
is a simple solution.




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[Don Wilhelm]

Dragon,

Just to eliminate the dummy load from questions, have you checked that
dummy load with an antenna analyzer on 40 meters?  If not, please do
that just to keep it above suspicion.

I certainly don't know the answer.  If you cannot identify the problem
source, an email to [hidden email] may provide additional information.

73,
Don W3FPR

On 1/14/2019 7:52 PM, Dragan 4O4A wrote:
> Hi Don,
> Thanks for prompt reply.
>
> No KAT3 installed.
> I'm aware that it is not a big deal, it's just annoying.
> However, I would like to understand what caused it and how to fix it - if it
> is a simple solution.
>
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[Dragan 4O4A]

Don,

Dummy load is OK, I tested it with another radio (IC-7300) which shows 1:1
SWR.
Thanks for advice about Support. I will certainly contact them.

73,
Dragan, 4O4A



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[KeithWE6R]

Check the 8.215 trap on the KAT3 ATU. It is C10 and L10 on the older units.
They can burn as they are on the ant side of the ATU.
We eliminated that trap on the newer KAT3A (not needed).
In repairs we pull the coil and put a wire jumper in its place.
Keith WE6R
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