[Elecraft] K2 w/KAT2 question

[Dave Van Wallaghen]

Petr,

Putting the KAT2 in CALS or CALP will place it in bypass mode, meaning 
the L-network is completely out of circuit. Your father's K2 will 
display SWR seen by the K2 or power output respectively. You can use 
POUT to TUNE the L-network into a 50Ω load and then using that solution, 
mode will display power output and SWR but with the KAT2 L-network in 
circuit looking into the external tuner. .

73,
Dave, W8FGU



On 9/1/2025 4:52:39 PM, "Petr Ourednik via Elecraft" 
<elecraft at mailman.qth.net> wrote:

>Dear Don,
>
>Many thanks.
>Could you be so kind to advise how to set KAT2 to bypass please?
>I did not find Bypass mode so it looks like some CALS or POUT? Will have to explain to father by phone…
>
>73 - Petr, OK1RP
>--
>B: http://ok1rp.blogspot.com
>YT: https://urlzs.com/UHNH9
>MeWe: https://bit.ly/2HGPoDx
>--
>機能するものを変更しないでください。
>What could be easier..?  ¯‍∖‍_‍(‍ツ‍)‍_‍/‍¯
>
>On Mon, Sep 1, 2025, at 10:33 PM, W3FPR wrote:
>>  Petr,
>>
>>  Do not use the lower panel BNC connector if the KAT2 is installed.
>>  There will be no power control and the K2 can be damaged due to
>>  excessive PA current.
>>  Use ANT1 or ANT2 on the KAT2 panel.  The KAT2 can be either set to
>>  bypass or do a TUNE into a 50 ohm dummy load using the ATU menu parameters.
>>
>>  73,
>>  Don W3FPR
>>
>>  On 9/1/2025 12:09 PM, Petr Ourednik via Elecraft wrote:
>>>  Hi folks,
>>>
>>>  so sorry for stupid question.
>>>
>>>  My father (83) is trying to use his K2 with KAT2 ATU installed.
>>>  As he is using antenna with LDG tuner in attic at the feed point
>>>  he is not sure if he should use main ANT/50Ohm connector or one of
>>>  the Ant1/Ant2 on the rear panel. (he does not want to use internal KAT2) right now.
>>>
>>>  He tried to put antenna to main ANT/50Ohms BNC connector and as it is listening,
>>>  he tried to key down and hoped that external tuner in attic works.
>>>
>>>  I am 200km away so I cannot check it, but I am worrying about the K2 finals if the
>>>  antenna path is not correct and SWR exceeds limits.
>>>  I tried to read K2 manual, but I did not find to me clear info. I only found the statement
>>>  "Do not use main ANT/50Ohm if ATU is installed" which makes me nervous.
>>>
>>>  Could someone be so kind to let me know or explain what is correct please?
>>>
>>>  Many thanks in advance.
>>>  (sorry I acquired K2 for father long time ago and I never used it as I am driving K3...)
>>>
>>>  73 - Petr, OK1RP
>>>
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