[Elecraft] KPA1500 / K3 Mystery

[wb6rse1 at mac.com]

Like K5MWR, my K3 & KPA1500 work correctly with the K3 going to the alternate power setting when the 1500 is switched in Standby.

K3: Firmware 5.67  Power Set per Band; Tuning power Normal.

KPA1500: Firmware 2.38  Band Change Standby = No.

Neither unit is connected to a computer for any control functions. The sole connection is an outboard analog to USB interface for the digi modes.

I'm open to checking any other settings that might illuminate.

GL - Steve WB6RSE

> On Oct 18, 2020, at 10:31 AM, Jack Brindle via Elecraft <elecraft at mailman.qth.net> wrote:
> 
> Might you have set the Normal power for the band to low power? There are two power levels, after all. We tend to pay attention to the low power setting for the KPA usage, but it is also quite possible to set the Normal (KPA on STBY) to a low level as well. That would get the effect you see.
> 
> 73!
> Jack, W6FB
> 
> 
>> On Oct 18, 2020, at 9:28 AM, ockmrzr at gmail.com wrote:
>> 
>> YES, when switching the KPA1500 between OPER and STBY, the K3 displays the
>> messages "KPA500 OPERATE" and "KPA500 STANDBY", depending.
>> 
>> 
>> 
>> YES, the K3 is set CONFIG: POWER SET is Per Band.
>> 
>> 
>> 
>> YES, when in STBY on the KPA1500, I set the "no amp" power to 100 watts, and
>> when in OPER, I set drive level per band; usually less than 30 watts, which
>> gets close to the legal limit.
>> 
>> 
>> 
>> Still the same results as described below.
>> 
>> 
>> 
>> 73 de Bruce, N7TY
>> 
>> Yuma, AZ
>> 
>> <http://www.qsl.net/n7ty> www.qsl.net/n7ty
>> 
>> 
>> 
>> From: ockmrzr at gmail.com <ockmrzr at gmail.com> 
>> Sent: October 18, 2020 06:32
>> To: 'elecraft at mailman.qth.net' <elecraft at mailman.qth.net>
>> Subject: KPA1500 / K3 Mystery
>> 
>> 
>> 
>> I made a recent change to the "Band Change-> STBY" setting on the KPA1500,
>> changing from NO to YES.  I did this to ensure the AMP doesn't have any wild
>> SWR or PWR spikes before the ATU has a chance to "remember" it's setting
>> after a band change.
>> 
>> 
>> 
>> Issue:  When switching the AMP from OPER to STBY, the K3 is supposed to
>> switch from the drive power setting (~25 watts) in OPER, to 100 watts in
>> STBY, it does not, it remains at the drive power setting.  I am 99% sure I
>> have all the cabling and settings set correctly in the K3 and KPA1500.  I
>> went through and manually reset the power settings on each band to let the
>> K3 and KPA1500 "re-learn" the change made, however, still no joy.
>> 
>> 
>> 
>> Jim, W6YA, and I have been going back and forth, however neither of us have
>> had any luck.
>> 
>> 
>> 
>> Do you KPA1500/K3 owners out there have any ideas or suggestions?
>> 
>> 
>> 
>> 73 de Bruce, N7TY
>> 
>> Yuma, AZ
>> 
>> www.qsl.net/n7ty <http://www.qsl.net/n7ty> 
>> 
>> 
>> 
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