[Elecraft] K2 Remote DC Power Control

[KG3VTomZ at gmail.com]

Don,

I get it. Thanks for the details. Just one more reason I am glad I  
converted to the separate Amp/ATU box. This makes it very easy.

73, Tom
KG3V


On , Don Wilhelm <w3fpr at embarqmail.com> wrote:
> Tom,



> First the answer about the K3 - there is some "cleanup" work that must be  
> done when the K3 is powered off, so the power off button should be used  
> rather than just "pulling the plug". With the K2, there is no difference  
> between "pulling the plug" and using the power switch. Yes, just like  
> your computer, the K3 is exposed to writing bad data if the plug is  
> pulled (or a power outage occurs). The chances of anything really  
> disastrous is small, but some "strange happenings" may reveal themselves  
> after such an event - the real answer is "it all depends" on what the K3  
> was doing at the time power went out - if it was writing something to  
> storage, that "last used frequency, mode, etc." may not be preserved  
> properly.



> If the base K2 and the KPA100 are mounted in the same box, then the  
> situation is different - you would have to interrupt the higher current  
> connection (to the KPA100) if everything were connected normally.

> Now, there "is a way" -- if you do not connect the AUX 12V connector from  
> the KPA100 to the base K2, the base K2 will not be powered by the KPA100  
> power supply connection - you will have to power the base K2 from the  
> coaxial connector. That makes the power off conditions the same as with  
> the remotely mounted KPA100.



> 73,

> Don W3FPR



> On 1/15/2012 8:26 PM, KG3VTomZ at gmail.com wrote:


> Don,



> Thanks for the reply, and for all your other help in configuring my K2  
> station over the last 5 years.



> Just out of curiosity - can this not be done if they are mounted in the  
> same box? I think when mine were configured that way, there still were  
> two separate 12V inputs - or do they get tied together? I would like to  
> know if my timeout-switch approach would be useable by someone with the  
> KPA-100 in the same chassis as the K2-base.



> Interesting that it sound like it is not as "safe" to pull power from the  
> K3 during operation. What about a natural power outage event? Would there  
> be some complications in the recovery process?



> 73, Tom

> KG3V





> On , Don Wilhelm w3fpr at embarqmail.com> wrote:

> > Tom,

> >

> >

> >

> > Yes, it is sufficient to kill the power to the base K2 (when the KPA100  
> is mounted remotely). Unlike the K3, there is little to be lost (bits  
> mixed up) if you turn the power source off for the K2 during normal  
> operation.

> >

> >

> >

> > 73,

> >

> > Don W3FPR

> >

> >

> >

> > On 1/15/2012 2:14 PM, KG3VTomZ at gmail.com wrote:

> >

> >

> > I am assembling a remotely-operated K2 station. I need a timer that will

> >

> > kill a "runaway transmitter." I am planning to install a kill-switch on  
> the

> >

> > 12 volt DC supply, as that is the only way I can be sure to disable the

> >

> > transmitter. If I have a K2 and the separate 100W power amp, is it

> >

> > sufficient/safe to just disable the power to the K2 base unit (leaving

> >

> > power to the amp connected)?

> >

> >

> >

> > Anybody else experienced in auto-shutoff of a K2?

> >

> >

> >

> >

> >

> >

> >