[Elecraft] K2 automatic tuner

[William@zendamateur.nl]

Ok Don and Knut,

Its getting better :-)

I tryed a antenne analyzer, gives me the same as my K2, so I think K2 is
fine.
The AT-100 ( just bought it second hand, has two antenna connectors wich I
can switch. Put a dummy on the other port then switched an tune the dummy 20
1.0 - 1 so looks ok
Did the same with connectors reversed so antenne 1 is antenne 2 again 20
1.0 - 1

But with the antenne it stil give me the same as my antenne analyzer.

Is this the tuner ??

William PE1BSB


-----Oorspronkelijk bericht-----
Van: Elecraft [mailto:elecraft-bounces at mailman.qth.net] Namens Don Wilhelm
Verzonden: woensdag 20 juli 2016 21:04
Aan: elecraft at mailman.qth.net
Onderwerp: Re: [Elecraft] K2 automatic tuner

Knut and all,

I do agree with that *and* if the band is 40 meters *and* if the KPA100 is
not the latest design T/R switch it is entirely possible that there could be
a spurious response above the 40 meter band during the time it takes to do
the antenna tuning - this may cause the ATU to tune the antenna somewhere
above the 40 meter band.
There is also the possibility that RFC10 (on the back of the SO-239
jack) is coupling with the base K2 - and that condition is worse if the
shield is the older one with a wide notch above the SO-239 jack and no
solder lugs from the SO-239 jack to the top of the shield.  I am not saying
that the problem is restricted to 40 meters, only that it is more apparent
on 40 than on other bands.

If the KPA100 has the older red core toroids at L15 and L16, it should be
updated with the KPA100MDKT because that mod was created to address exactly
that problem.
If the shield needs updated, the KPA100SHLDKT is available.

73,
Don W3FPR

On 7/20/2016 2:38 PM, ab2tc wrote:
> Hi all,
>
> I can think of one other *possible* explanation, although far fetched. 
> If the K2 transmitter has excessive harmonics or parasitics, this could
happen.
> The out of band energy is readily absorbed by the dummy load but not 
> by the tuned load presented by the LDG tuner. The antenna analyzer 
> should easily resolve this.
>
>

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