[Elecraft] When Transmitting on FT8 - KPA500 has issues - KD8ZYD

[David Haines]

I haven't been following this thread closely, but it sounds like what 
has been going on with my K3X with KXPA100 and internal ATU on FT8.

Transmitting with 100w, the relays click rapidly while the power meter 
on the KXPA100  jumps up and down.  Seems to be trying to find a match 
that's not there.  I've been trying different settings and the problem 
goes away when I increase the "power" (audio output) slider on WSJT-X.  
Increasing MIC GAIN and reducing the WSJT-X "power" slider seems to fix 
it too. Does this make sense to anybody?

73, David, KC1DNY

On 7/1/2019 9:26 PM, Fred wrote:

> Hi Ken,
>
> It only happens when running digital mode FT8. And it doesn’t happen all the time when running digital mode. Ken I’ll send the video I made. I just looked at it and it has an *.
>
> Thanks,
>
> Fred
> 248-613-4086
>
> Sent from my iPhone
>
>> On Jul 1, 2019, at 9:22 PM, Ken Winterling <wa2lbi at gmail.com> wrote:
>>
>> Fred,
>>
>> Does this condition also happen on SSB, RTTY, CW or only while running digital mode?
>>
>> Is it possible the PTT/key line is being dropped?  When the power drops is there an asterisk (*) on the left side of the KPA500 display?  An asterisk will appear on the left side of the LCD display if there is a valid PA KEY/PTT signal is being received from the transceiver. If there is no asterisk the amp isn't receiving a valid PA KEY/PTT signal from the transceiver.  If there is an underscore instead of an asterisk it means that the amplifier keying is being inhibited by a low signal on pin 11 of the AUX connector.
>>
>> Ken
>> WA2LBI
>>   
>>
>>
>>
>>
>>> On Mon, Jul 1, 2019 at 9:06 PM Fred <thegoeckel at gmail.com> wrote:
>>> Hi,
>>>
>>> I have a K3, P3, KPA500, KAT500 and a SignaLink for sound.  Sometimes when
>>> I transmit on FT8 running full power on the KPA500, the KPA500 will click
>>> on/off.  The power doesn't turn on/off, it seems like a relay inside.  The
>>> power meter will go to about 500 watts, then down to 0, then to abut 500
>>> watts...and down to 0 maybe once a second.  I have a short video I can send
>>> if someone would like to see it.  When I bypass the KPA500 and use 50 watts
>>> or so just on the K3, no issues.
>>>
>>> Please let me know if you have any questions.
>>>
>>> 73, Fred
>>>
>>> KD8ZYD
>>> -- 
>>> Thanks,
>>>
>>> Fred
>>>
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