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K3/100 suddenly shut down on FT8 TX

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Yoshida Akira

K3/100 suddenly shut down on FT8 TX

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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jh3sif

Re: K3/100 suddenly shut down on FT8 TX

LPA temperature may be over its upper limit during transmitting FT8.
If so, I would suggest to check and tighten the 3 screws securing 3 LPA transistors to the rear bottom cover.

73 de JH3SIF, Keith

> 2020/06/09 9:00、Yoshida Akira <[hidden email]>のメール:
>
> 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
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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Yoshida Akira

Re: K3/100 suddenly shut down on FT8 TX

On 2020/06/09 10:27, Keith Onishi wrote:

> LPA temperature may be over its upper limit during transmitting FT8.
> If so, I would suggest to check and tighten the 3 screws securing 3 LPA transistors to the rear bottom cover.
>
> 73 de JH3SIF, Keith
>
>> 2020/06/09 9:00、Yoshida Akira <[hidden email]>のメール:
>>
>> 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
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
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>
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--
73 de aki
JA1NLX
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Yoshida Akira

Re: K3/100 suddenly shut down on FT8 TX

In reply to this post by Yoshida Akira

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 ?
>

Bob McGraw - K4TAX

Re: K3/100 suddenly shut down on FT8 TX

I’m curious. When transmitting, why would one press the POWER button on the radio other than to turn the radio off?

Something I am missing here.

Bob, K4TAX

Sent from my iPhone

> On Jun 8, 2020, at 9:34 PM, Yoshida Akira <[hidden email]> 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
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

David Herring

Re: K3/100 suddenly shut down on FT8 TX

He hits the power button to turn it back on.

73,
David - N5DCH

> On Jun 8, 2020, at 8:42 PM, Bob McGraw K4TAX <[hidden email]> wrote:
>
> I’m curious. When transmitting, why would one press the POWER button on the radio other than to turn the radio off?
>
> Something I am missing here.
>
> Bob, K4TAX
>
>
> Sent from my iPhone
>
>> On Jun 8, 2020, at 9:34 PM, Yoshida Akira <[hidden email] <mailto:[hidden email]>> 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
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft <http://mailman.qth.net/mailman/listinfo/elecraft>
>> Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm>
>> Post: mailto:[hidden email] <mailto:[hidden email]>
>>
>> This list hosted by: http://www.qsl.net <http://www.qsl.net/>
>> Please help support this email list: http://www.qsl.net/donate.html <http://www.qsl.net/donate.html>
>> Message delivered to [hidden email] <mailto:[hidden email]>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> Please help support this email list: http://www.qsl.net/donate.html
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Yoshida Akira

Re: K3/100 suddenly shut down on FT8 TX

In reply to this post by Bob McGraw - K4TAX

Bob

When transmitting FT8, it suddenly shut down (power OFF) Of course I do
not touch
any button. It looks as if I push Power button.

After a while I push Power button and it turns power ON. Maybe Power
button problem ???

73

On 2020/06/09 11:42, Bob McGraw K4TAX wrote:

> I’m curious. When transmitting, why would one press the POWER button on the radio other than to turn the radio off?
>
> Something I am missing here.
>
> Bob, K4TAX
>
>
> Sent from my iPhone
>
>> On Jun 8, 2020, at 9:34 PM, Yoshida Akira <[hidden email]> 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
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>

Gwen Patton

Re: K3/100 suddenly shut down on FT8 TX

IT sounds like you're having a problem with the radio overheating and
shutting down. FT8 and other digital modes like it have VERY long duty
cycles, so the radio gets hot very fast. If the cooling can't keep up, the
radio shuts down to protect itself. Reduce your RF power and see if it
helps. If this hasn't happened for a long time, maybe you have a bad fan,
or maybe you need to clean the radio. It might have a lot of dust keeping
the fans from cooling it properly, just like a computer. I have to clean my
computer regularly, to get the cat hair out of it so it doesn't overheat!

I hope this helps! ごきげんよう！

-=-=-=-=-=-=-=-=-
73,
Gwen, NG3P

On Mon, Jun 8, 2020 at 11:01 PM Yoshida Akira <[hidden email]>
wrote:

> Bob
>
> When transmitting FT8, it suddenly shut down (power OFF) Of course I do
> not touch
> any button. It looks as if I push Power button.
>
> After a while I push Power button and it turns power ON. Maybe Power
> button problem ???
>
> 73
>
> On 2020/06/09 11:42, Bob McGraw K4TAX wrote:
> > I’m curious. When transmitting, why would one press the POWER button on
> the radio other than to turn the radio off?
> >
> > Something I am missing here.
> >
> > Bob, K4TAX
> >
> >
> > Sent from my iPhone
> >
> >> On Jun 8, 2020, at 9:34 PM, Yoshida Akira <[hidden email]>
> 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
> >> ______________________________________________________________
> >> Elecraft mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:[hidden email]
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> >> Message delivered to [hidden email]
> >
> --
> 73 de aki
> JA1NLX
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Bill Frantz

Re: K3/100 suddenly shut down on FT8 TX

In reply to this post by Yoshida Akira

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, [hidden email] (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 ?
>>

-----------------------------------------------------------------------
Bill Frantz | gets() remains as a monument | Periwinkle
(408)348-7900 | to C's continuing support of | 150
Rivermead Rd #235
www.pwpconsult.com | buffer overruns. |
Peterborough, NH 03458

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Yoshida Akira

Re: K3/100 suddenly shut down on FT8 TX

In reply to this post by Yoshida Akira

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 ?
>>

Elecraft mailing list

Re: K3/100 suddenly shut down on FT8 TX

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 <[hidden email]> 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
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Yoshida Akira

Re: K3/100 suddenly shut down on FT8 TX

In reply to this post by Yoshida Akira

Hi all

Maybe my problem looks solved. Referring to suggestions I checked all
coax cables.
I found a cable with bad poor contact at both end plugs. K3 see very
high SWR instantaneously
and it shout down.
I have not seen the problem for several hours since bad cable was replaced.

Thanks again for suggestions.

73

On 2020/06/10 7:15, Yoshida Akira 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 ?
>>>