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

[Nr4c]

Does this happen without the amp?  

Sent from my iPhone
...nr4c. bill


> On Jul 2, 2019, at 8:13 PM, Fred <thegoeckel at gmail.com> wrote:
> 
> I’m going to try and answer all the questions that have shown up in this
> thread.  I really appreciate all the ideas and things to check.  I do have
> a day job (7 years to go) so I only have time to play with this at night
> and try and debug.
> 
> 
> 
> I drive my KPA 500 with somewhere between 20 and 25 watts from the K3
> depending on the band
> 
> 
> 
> I do not get any faults on the KPA 500 or KAT 500.
> 
> 
> 
> The fault log on the KPA 500 was clean
> 
> 
> 
> I will test with WSJTx in the Tune mode and report back.  I will check the
> sound card settings to make sure they are correct
> 
> 
> 
> My computer is home built, i5-4590 CPU @ 3.3 GHz, 16 GB Memory, SSD Drive,
> decent graphics card
> 
> 
> 
> Andy, K3WYC posted - I have not looked at the video but this sounds very
> similar to a problem I have seen.   In my case HDSDR sound output had
> spontaneously changed to TS-590 TX CODEC creating a feedback loop through
> the PC.  Break the loop and all is normal.  – Question, how do you break
> the loop?
> 
> 
> 
> All connections are good.  When I built the K-Line, I made all new Co-ax
> cables with Amphenol connectors.  All Elecraft cables are less than 2 years
> old.
> 
> 
> 
> I need to add a ground from my MFJ Anderson Power Poll connection strip.
> Everything else is grounded to a ground bar, to a 10 foot copper rod
> outside the house, connected to another 10 foot copper rod at my tower and
> so on.
> 
> 
> 
> I have not tried to see if this happens at 200 watts.  I need to pay
> attention to see if it happens just on certain bands, or only on my Mosley
> or my wire dipole.  It never happens if I am not using the KPA 500.
> 
> 
> 
> Jack, W6FB if I let this go and check things as it is happening, do you
> think I could damage my equipment?  That is one thing that worries me so
> when it happens, I kill the transmit ASAP
> 
> 
> 
> I want to thank everyone in the Elecraft community for all the replies!!
> Thanks a lot!!
> 
> 
> 
> Please let me know if anyone has any other questions.
> 
> 
> 
> Fred, KD8ZYD
> 
> -- 
> Thanks,
> 
> Fred
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