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K2 with KAT2 and KXPA100 with ATU - Correct setup?

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Mark Raybould-2

K2 with KAT2 and KXPA100 with ATU - Correct setup?

I have built, installed and tested a keying circuit and followed the
instructions to interface the KXPA100 with the "Basic Operation with any
Transceiver". My KX3 requires PA Mode to be On allowing all antenna
matching to be done by the KXPA100. With the K2 and its KAT2 ATU, I cannot
identify how to bypass the ATU and allow the KXPA100's ATU to do the
antenna matching. I have previously adjusted the KXPA100's ALC to
accommodate an FT817.

Or, use J4 Ant on the RF Board as the interface to the KXPA100. The relays
in the K2 will click and have no effect on the matching to the KXPA100. In
this configuration, a 1.5 Watt unattenuated by the 3db KXPA100 Switch,
shows a power output of 60 Watts on all KXPA100 modes.

Any comments and/or observations are most welcome.

73, Mark
G3XYS

MacBook Pro
NNNN
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Don Wilhelm-4

Re: K2 with KAT2 and KXPA100 with ATU - Correct setup?

Mark,

Set the K2 ATU menu parameter to CALP or CALS depending on whether you
want to read the Power or SWR between the K2 and the KXPA100.
Those two setting "bypass" the KAT2 (except for any residual reactance).
CALP will not work because that setting retains the last used L/C
combination.

73,
Don W3FPR

On 3/31/2015 2:24 PM, Mark Raybould wrote:
> I have built, installed and tested a keying circuit and followed the
> instructions to interface the KXPA100 with the "Basic Operation with any
> Transceiver". My KX3 requires PA Mode to be On allowing all antenna
> matching to be done by the KXPA100. With the K2 and its KAT2 ATU, I cannot
> identify how to bypass the ATU and allow the KXPA100's ATU to do the
> antenna matching. I have previously adjusted the KXPA100's ALC to
> accommodate an FT817.
>
>

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vk2rq

Re: K2 with KAT2 and KXPA100 with ATU - Correct setup?

I think Don meant *POUT* mode won't work because it retains the L/C setting. CALP mode works fine bypassing the ATU, and this is what I normally use. In fact, I assign the ATU mode menu setting to the PF1 key so I can easily activate/deactivate the KAT2 depending whether I am using the KXPA100 or not.

73,
Matt VK2RQ

> On 1 Apr 2015, at 6:58 am, Don Wilhelm <[hidden email]> wrote:
>
> Mark,
>
> Set the K2 ATU menu parameter to CALP or CALS depending on whether you want to read the Power or SWR between the K2 and the KXPA100.
> Those two setting "bypass" the KAT2 (except for any residual reactance).
> CALP will not work because that setting retains the last used L/C combination.
>
> 73,
> Don W3FPR
>
>> On 3/31/2015 2:24 PM, Mark Raybould wrote:
>> I have built, installed and tested a keying circuit and followed the
>> instructions to interface the KXPA100 with the "Basic Operation with any
>> Transceiver". My KX3 requires PA Mode to be On allowing all antenna
>> matching to be done by the KXPA100. With the K2 and its KAT2 ATU, I cannot
>> identify how to bypass the ATU and allow the KXPA100's ATU to do the
>> antenna matching. I have previously adjusted the KXPA100's ALC to
>> accommodate an FT817.
>>
>>
>
> ______________________________________________________________
> Elecraft mailing list
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> Please help support this email list: http://www.qsl.net/donate.html
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Don Wilhelm-4

Re: K2 with KAT2 and KXPA100 with ATU - Correct setup?

Matt,

Sorry about the "brain fade" I did not type what my mind was thinking.
Yes, POUT will not work for the reasons mentioned - CALP *will* work to
bypass the KAT2.
Either CALP or CALS setting of the KAT2 will bypass the L/C components.

73,
Don W3FPR

On 3/31/2015 4:42 PM, Matt VK2RQ wrote:

> I think Don meant *POUT* mode won't work because it retains the L/C setting. CALP mode works fine bypassing the ATU, and this is what I normally use. In fact, I assign the ATU mode menu setting to the PF1 key so I can easily activate/deactivate the KAT2 depending whether I am using the KXPA100 or not.
>
> 73,
> Matt VK2RQ
>
>> On 1 Apr 2015, at 6:58 am, Don Wilhelm <[hidden email]> wrote:
>>
>> Mark,
>>
>> Set the K2 ATU menu parameter to CALP or CALS depending on whether you want to read the Power or SWR between the K2 and the KXPA100.
>> Those two setting "bypass" the KAT2 (except for any residual reactance).
>> CALP will not work because that setting retains the last used L/C combination.
>>
>> 73,
>> Don W3FPR
>>
>>> On 3/31/2015 2:24 PM, Mark Raybould wrote:
>>> I have built, installed and tested a keying circuit and followed the
>>> instructions to interface the KXPA100 with the "Basic Operation with any
>>> Transceiver". My KX3 requires PA Mode to be On allowing all antenna
>>> matching to be done by the KXPA100. With the K2 and its KAT2 ATU, I cannot
>>> identify how to bypass the ATU and allow the KXPA100's ATU to do the
>>> antenna matching. I have previously adjusted the KXPA100's ALC to
>>> accommodate an FT817.
>>>
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
> ______________________________________________________________
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>