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

[Fred]

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
>>