K3 & KPA500 Spike in Output Power

[Peter Quick]

I have fairly new K3 & KPA500. They both are running the latest
software. When on CW I typically call a station with my RX filter set
at 2.8kHz. If there is an increase in noise level, or other adjacent
signals I will switch receive BW progressively from 2.8kHz to 1.8 then
400Hz. When I then resume transmitting I notice that I will see what
appears to be a power spike on the wattmeter on the KPA500 from 500 to
700 watts for one or two dits, then drop back down to 500 watts. The
fault light does not flicker or come on when this happens. This never
happens when switching to 250Hz. It consistently happens when going from
2.8 to 1.8 and from 1.8 to 400. All filters are from Elecraft and are 8
pole.

Have others seen this and is it normal?
Is there a problem with this?
Is it an actual spike in power from the K3 resulting in a spike from the
amplifier?

73 Peter VE3SO
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[Ken Wagner K3IU]

You might try doing a TX Gain
Calibration. It is in the K3 utility
program.
73,
Ken K3iU
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
On 10/26/2011 1:08 PM, Peter Quick wrote:

> I have fairly new K3&  KPA500. They both are running the latest
> software. When on CW I typically call a station with my RX filter set
> at 2.8kHz. If there is an increase in noise level, or other adjacent
> signals I will switch receive BW progressively from 2.8kHz to 1.8 then
> 400Hz. When I then resume transmitting I notice that I will see what
> appears to be a power spike on the wattmeter on the KPA500 from 500 to
> 700 watts for one or two dits, then drop back down to 500 watts. The
> fault light does not flicker or come on when this happens. This never
> happens when switching to 250Hz. It consistently happens when going from
> 2.8 to 1.8 and from 1.8 to 400. All filters are from Elecraft and are 8
> pole.
>
> Have others seen this and is it normal?
> Is there a problem with this?
> Is it an actual spike in power from the K3 resulting in a spike from the
> amplifier?
>
> 73 Peter VE3SO
> ______________________________________________________________
> 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
>

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[Peter Quick]

Thanks for the suggestion. I just finished the TX Gain Calibration &
the problem is fixed.

..73 Peter VE3SO

On 10/26/2011 1:11 PM, Ken Wagner K3IU wrote:

> You might try doing a TX Gain Calibration. It is in the K3 utility program.
> 73,
> Ken K3iU
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
> On 10/26/2011 1:08 PM, Peter Quick wrote:
>> I have fairly new K3& KPA500. They both are running the latest
>> software. When on CW I typically call a station with my RX filter set
>> at 2.8kHz. If there is an increase in noise level, or other adjacent
>> signals I will switch receive BW progressively from 2.8kHz to 1.8 then
>> 400Hz. When I then resume transmitting I notice that I will see what
>> appears to be a power spike on the wattmeter on the KPA500 from 500 to
>> 700 watts for one or two dits, then drop back down to 500 watts. The
>> fault light does not flicker or come on when this happens. This never
>> happens when switching to 250Hz. It consistently happens when going from
>> 2.8 to 1.8 and from 1.8 to 400. All filters are from Elecraft and are 8
>> pole.
>>
>> Have others seen this and is it normal?
>> Is there a problem with this?
>> Is it an actual spike in power from the K3 resulting in a spike from the
>> amplifier?
>>
>> 73 Peter VE3SO
>> ______________________________________________________________
>> 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
>>
>

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