[Elecraft] K3-Front panel shut down question.

[Don Wilhelm]

Someone also mentioned that the UPS might generate some hash - BUT that 
would only be true if the AC is removed from the UPS.  Under normal 
conditions with AC present, the inverter is not active.

It was not the initial question, but -- if you want to keep transmitting 
after an outage, you will have to implement the large battery solutions 
that have been mentioned.

73,
Don W3FPR

On 8/18/2011 2:22 PM, Guy Olinger K2AV wrote:
> I'll repeat W2CS suggestion, get a UPS, then plug the K3's power supply into
> the UPS. Since you are trying only to allow yourself to shut down cleanly,
> you can get the smallest capacity, and therefore the cheapest version. It
> will handle the K3's RX current for quite a while, even with a small UPS.
>
> Some of the commentary seems to be about creating a full run floating
> battery alternate supply.  If you want that, it's one approach, but if all
> you want is orderly shut down, you hardly need go that far.
>
> If you already have a UPS for your PC, plug the K3's power supply into that
> UPS.  When you are operating with AC the extra drain makes no difference to
> the UPS.  When the power goes down, cease transmitting quickly and you will
> be fine.  The K3 in RX only adds about 20 watts to the load on the AC.
>
> 73, Guy.
>
> On Thu, Aug 18, 2011 at 10:36 AM, Ron D'Eau Claire<ron at cobi.biz>  wrote:
>
>> The danger with the K3 seems to be if power is removed while it's actively
>> writing new data to memory. Early in the K3 program several people who
>> switched power off at the supply quickly reported finding the firmware
>> "corrupted" in various ways upon restoring power because of that.
>>
>> Certainly no physical damage was done, but it is rather inconvenient to
>> reload all the firmware.
>>
>> 73,
>>
>> Ron AC7AC
>>
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