[Elecraft] K3 (not S) Antenna tuner strangeness

[brian]

Thanks Don,
Very instructive.
All relays click.
Tabulated below are the L/C test results.
The only anomaly appears to be with C2.  It seems to act as a 100 pf 
rather than the 22 pf it is supposed to be.

SWR's 50 ohm dummy load attached to antenna port of K3
-------------------------------------
L test
Bypass 1.0 50.1 MHz
L1 1.1
L2 1.8
Bypass 1.0 28.1 MHz
L1 1.0
L2 1.0
L3 1.5
L4 3.3
L5 14
Bypass 1.0 14.10 MHz
L5 3.9
L6 9.8
Bypass 1.0 7.05 MHz
L6 4.2
L7 8.9
Bypass 1.81 MHz
L7 2.3
L8 4.6
-------------------------------------------------
28.1 MHz Bypass = 1.0    21.0 MHz Bypass =1.0
C1 1.4                    C1  1.3
C2 2.5                    C2  2.1
C3 1.5                    C3  1.4
C4 1.7                    C4  1.5
C5 5.5
14.1 MHz Bypass =1.0
C5 2.6
C6 5.2
7.05 MHz Bypass =1.0
C6=1.7
C7=3.9
C8=10.9
----------------------------------------------------------
Not sure if the C2 anomaly is relevant to 160/80 M

73 de Brian/K3KO

On 7/25/2016 18:11 PM, Don Wilhelm wrote:
> Brian,
>
> You might try going into the KAT3 menu and go through the L1-L8 and
> C1-C8 settings to hear the relays click with each selection.
>
> If all the relays are working, you should be able to do a check on the
> health of the inductors and capacitors using a method similar to that
> shown for the KAT100 in the right column of page 35 - manually select
> the inductors starting with L1 and see what the SWR is on a high band.
> With each other inductor, the SWR should increase.  Change to a lower
> band if the SWR gets too high to indicate (highest is 9.9).  Do the same
> for the capacitors.
>
> I have not tried this technique with the KAT3 (but it should work) - I
> have used it with the KAT100 and the KAT2.
>
> 73,
> Don W3FPR
>
> On 7/25/2016 9:30 AM, brian wrote:
>> Hi Don,
>>
>> Further insight needed.
>>
>> John and I have looked into the 80M tuner strangeness problem further.
>> We both have qualitatively seen the same thing.  It is related to
>> trying to tune Z's that are on the order of 25-30 ohms on 160M/80M.
>>
>