Hi Cur?

[Jim AB3CV]

While transmitting some JT9 at 100w on 6m yesterday and watching the
voltage display on the K3 menu I occasionally saw a HI CUR message which
then disappeared after less than a second.

I've never seen this before. I was monitoring the voltage after putting in
some new cabling from the PS and it has made the supply voltage more
stable. The K3 now reads no less than 12.5v while transmitting 100w.

Not sure where to start or just to forget about it until it shows a
persistent fault.

SWR is low and feedlines are 7/8" hardline so I don't think there's a fault
in those. If there was I'm sure it would be more evident with the KPA500 at
full tilt but there's no such indication.

I do have the KPA3 replacement pins kit which I've not yet installed. Is
this fault associated with those pin issues?

Thanks

Jim ab3cv
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[David Pratt]

It depends what frequency you are using, Jim, but according to the
transmitter specification on page 9 of the Owner's Manual, the suggested
maximum power on 51-52 MHz is 85W.  For 100% duty cycle modes it might
be best to turn the power down a bit.

73 de David G4DMP

In a recent message, Jim Miller <[hidden email]> writes
>While transmitting some JT9 at 100w on 6m yesterday and watching the
>voltage display on the K3 menu I occasionally saw a HI CUR message which
>then disappeared after less than a second.

--
 + - - - - - - - - - - - - - - - - +
 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
 + - - - - - - - - - - - - - - - - +

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[Jim AB3CV]

Dave

Nice catch! I was on 50.278 but I'll turn the wick down a bit unless using
the KPA500.

73

jim ab3cv


On Fri, Aug 9, 2013 at 10:47 AM, David G4DMP <[hidden email]>wrote:

> It depends what frequency you are using, Jim, but according to the
> transmitter specification on page 9 of the Owner's Manual, the suggested
> maximum power on 51-52 MHz is 85W.  For 100% duty cycle modes it might
> be best to turn the power down a bit.
>
> 73 de David G4DMP
>
> In a recent message, Jim Miller <[hidden email]> writes
> >While transmitting some JT9 at 100w on 6m yesterday and watching the
> >voltage display on the K3 menu I occasionally saw a HI CUR message which
> >then disappeared after less than a second.
>
> --
>  + - - - - - - - - - - - - - - - - +
>  | David M Pratt, Kippax, Leeds.   |
>  | Website: http://www.g4dmp.co.uk |
>  + - - - - - - - - - - - - - - - - +
>
>
>

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[Eric Swartz - WA6HHQ]

Jim,

What is your power supply voltage as reported by the K3 when transmitting? As
power supply voltage drops the K3 increases current in order to put out the
requested power. If the voltage is dropping too low this can result in the
hi-cur message.

Also, the threshold for the hi-cur message is adjustable in theK3's tech mode
menu, I believe.

73,

Eric
elecraft.com

On 8/9/2013 7:23 AM, Jim Miller wrote:

> While transmitting some JT9 at 100w on 6m yesterday and watching the
> voltage display on the K3 menu I occasionally saw a HI CUR message which
> then disappeared after less than a second.
>
> I've never seen this before. I was monitoring the voltage after putting in
> some new cabling from the PS and it has made the supply voltage more
> stable. The K3 now reads no less than 12.5v while transmitting 100w.
>
> Not sure where to start or just to forget about it until it shows a
> persistent fault.
>
> SWR is low and feedlines are 7/8" hardline so I don't think there's a fault
> in those. If there was I'm sure it would be more evident with the KPA500 at
> full tilt but there's no such indication.
>
> I do have the KPA3 replacement pins kit which I've not yet installed. Is
> this fault associated with those pin issues?
>
> Thanks
>
> Jim ab3cv
> ______________________________________________________________
> 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

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