Re: [Elecraft] Fwd: Re: K3 SHUTTING DOWN OPERATING JT65

[Bob McGraw K4TAX]

My K3S does show the voltage and current on its display.  In receive it 
nominally is 13.8 volts and 1.05 amps.   For transmit, CW mode key 
closed 100 watts output the current is 18.5 amps. Both of these values 
concur with my power supply metering.


I've experienced no shut down while operating JT-65 or more recently 
FT-8.  For JT-65 I normally set the PWR to 50 watts. For FT-8, being a 
shorter transmit time, although duty cycle is the same as JT-65 or about 
50%, I do sometimes run 100 watts. More often I find 25 to50 watts to be 
most adequate.


73

Bob, K4TAX

K3S s/n 10163


On 7/25/2017 11:14 AM, Colin wrote:
Buddy/Mike, further to my earlier email the current on receive is 
actually 1.05A as measured on a digital multimeter and not 5A as 
indicated on the PSU analogue meter.


Of course this doesn't solve the immediate problem.

73

Colin, G3PSM






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Re: [Elecraft] Fwd: Re: K3 SHUTTING DOWN OPERATING JT65

[Mike Flowers]

If you have a dummy load, try running JT8 or JT65 into that at your usual
power.If problem does not reoccur, then likely RFI is the culprit.

If it does reoccur, then likely the K3 is having issues.

- 73 and good DX de Mike, K6MKF, Past President - NCDXC 

> -Original Message-
> From: elecraft-boun...@mailman.qth.net [mailto:elecraft-
> boun...@mailman.qth.net] On Behalf Of Colin
> Sent: Tuesday, July 25, 2017 9:15 AM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] Fwd: Re: K3 SHUTTING DOWN OPERATING JT65
> 
> Buddy/Mike, further to my earlier email the current on receive is actually
1.05A
> as measured on a digital multimeter and not 5A as indicated on the PSU
analogue
> meter.
> 
> Of course this doesn't solve the immediate problem.
> 
> 73
> 
> Colin, G3PSM
> 
> 
> 
> 
> 
>  Forwarded Message 
> Subject:  Re: [Elecraft] K3 SHUTTING DOWN OPERATING JT65
> Date: Tue, 25 Jul 2017 16:01:10 +0100
> From: Colin 
> To:   elecraft@mailman.qth.net
> 
> 
> 
> Mike, I am experiencing a similar thing.   I had a session on FT8 a few
> days ago and my K3 shut down completely, in fact it blew a 20A fuse on my
> alternate 20A PSU but just shuts down on my 40A supply.
> 
> One thing I notice is that it appears to be drawing nearly 5 Amps on
receive
> which is excessive and one occasion while I was testing actually shut down
on
> receive.
> 
> It isn't the DC lead as I have replaced that with a factory supplied item.
> 
> I'm still working on it but unless the experts in this group have any
ideas I will
> attempt to re-invent the wheel.
> 
> 73
> 
> Colin, G3PSM
> 
> On 23/07/2017 03:17, Michael Walker wrote:
> > Hi Buddy
> >
> > I can thing of 2 things.  Overheating .. not likely since usually the
> > RF section shut downs.
> >
> > RF getting into the power supply.  Grounding might not make a
difference.
> > RF Chokes on the power supply DC cord might help.
> >
> > Oh, the 3rd thing, Is your power supply up to the task?  Might it be
> > failing? Throw a volt meter on it.
> >
> > Mike va3mw
> >
> >
> > On Sat, Jul 22, 2017 at 9:28 PM, buddy s  wrote:
> >
> >> i am using wsjt-x software for jt65 using my k3.  after operating for
> >> approximately 2 hours today,  i answered a cq, and after 30 seconds
> >> the k3 shut down completely.  i waited a few minutes and changed
> >> antennas.  the k3 powered up, and i tried again.  same result,
> >> shutdown after 30 seconds of transmitting.  my power is set to 30
> >> watts, and i am using a kat500 with both antennas.
> >>
> >> any suggestions, any questions?
> >>
> >> 73 de
> >> W3BS, Buddy Spiegel
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