[Elecraft] KPA-1500: Strange Symptoms on FT8

[Pete Smith N4ZR]

My Winkeyer has settings for both lead and tail time, and so does 
N1MM+.  WSJT-X does not appear to have these variables.

73, Pete N4ZR

On 1/14/2024 11:04 AM, Lou Laderman wrote:
> Pete, your issue may only be on the back end of the transmission, and 
> adjusting the delay time for the exciter to kick in is on the front 
> end to prevent a hot transmission before the amp kicks in. I don’t 
> know if the back end can be corrected on your exciter, or somewhere in 
> the kpa1500’s menus. I don’t have the issue you reported and haven’t 
> looked through the settings on my K4 or kpa1500. If all else fails, 
> try posting on the kpa1500 groups.io, of ask Elecraft support directly.
>
>
> Lou Laderman
> (314) 308-4363
> Sent from my mobile device
>
> On Jan 14, 2024, at 7:28 AM, Pete Smith N4ZR <pete.n4zr at gmail.com> wrote:
>
> 
>
> Interesting idea, Lou.  I'll give it a try and see.
>
> 73, Pete N4ZR
> On 1/13/2024 1:07 PM, Lou Laderman wrote:
>> Pete, have you tried increasing the transmit delay between your exciter and the amp? If the exciter continues to transmit briefly after the amp’s relay kicks out, you could see an swr spike.
>>
>> 73, Lou W0FK
>>
>> Lou Laderman
>> Sent from my iPad
>>
>>> On Jan 13, 2024, at 10:50 AM, Pete Smith N4ZR<pete.n4zr at gmail.com>  wrote:
>>>
>>> I've been operating 160M FT8 recently, and am noticing some odd symptoms from my amp that seem only to occur in FT8 mode.  Even running only about 1170 watts into a good dummy load, with the KPA-1500's ATU bypassed and a displayed SWR of 1.0:1 during transmit, as soon as the transmission ends both the display on the amp and the KPA-1500 utility show SWRs ON RECEIVE  of  1.6-1.9:1.
>>>
>>> I just tested on 80 meters, and am seeing the same anomaly on FT8. This does not happen on CW.
>>>
>>> The question is, where is this spurious reading coming from, and should I be concerned?
>>>
>>> 73, Pete N4ZR
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