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

[Bill Frantz]

I have seen this problem with my K3 when the voltage drops 
suddenly and the radio just shuts down. Check the voltage while 
sending using the internal volt meter in the radio and see 
whether the voltage significantly drops during transmit.

Gwen's idea of too much heat may also be correct, but I never 
had significant heat problems with my K3/100 running FT8 at 
100W. I could hear the fans speed up by the end of a FT8 cycle 
and then drop back by the end of a receive cycle. You can also 
monitor the PA TEMP to see how high it is.

Both these measurements are accessed by toggling DISP and 
turning the VFO B knob.

73 Bill AE6JV

On 6/9/20 at 10:33 PM, ja1nlx0205 at my.email.ne.jp (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 ?
>>
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