[Elecraft] K3/100 suddenly shut down on FT8 TX

[James Bennett]

I have not completely followed this thread, but have you tried using a dummy load to see if the problem still happens? If it does, can you try a different coax between the K3 and the dummy load?

73, Jim / W6JHB

> On Jun 9, 2020, at 3:15 PM, Yoshida Akira <ja1nlx0205 at my.email.ne.jp> wrote:
> 
> Hi all
> 
> Thanks for more suggestions, however I am not happy.
> I noticed this a several times yesterday when transmitting FT8 with 50W.
> 
> I checked DX cable and connectors. It looks OK. I look at voltage, current and PA Temp
> with internal meter. I do not notice any significant jump just before shut down.
> 
> It is better for me to send K3/100 to JA dealer who checked everything, sometimes
> replaced parts before.
> 
> BTW: my K3/100 s/n 00060  arrived on 2007/12   I still like this radio best.
> 
> Thanks
> 
> 73
> 
> 
> On 2020/06/09 11:33, Yoshida Akira wrote:
>> Hi all
>> 
>> Thanks for suggestions. All look OK to me.
>> 
>> Power supply is Powerwerx ss-30DV. I do not use Powerpole connector
>> in the front panel, instead use terminal in the back panel.
>> 
>> I use this power supply for another TRX also and have never noticed the problem.
>> 
>> 73
>> 
>> On 2020/06/09 9:00, Yoshida Akira wrote:
>>> Hi all
>>> 
>>> I have never seen this for many years, however I recently noticed twice
>>> when transmitting FT8 with 100W. No alarm and error message.
>>> When I simply push POWER button in front panel then it turns ON again.
>>> 
>>> PA temp, DC voltage and DC current looks good. I do not believe RFI
>>> cause this problem.
>>> 
>>> Any idea ?
>>> 
> -- 
> 73 de aki
> JA1NLX
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