[Elecraft] K3-Front panel shut down question.

[Van W1WCG]

Not necessarily true -- I had an APC UPS that created continuous 
60Hz-flavored hash on all ham bands (at least up to 21 MHz), S6-S7 
level, whether commercial power was present or not.  I wrote to APC and 
they said their equipment met FCC regulations with regard to spurious 
emissions, and very kindly sent me a deluxe noise-and-surge suppression 
outlet strip.  It made no impression whatsoever on the noise, nor did 
one clamp-on ferrite bead (all I had that would fit the cord at the 
time) on the AC supply cord next to the unit make any difference.  
Perhaps if I had had enough beads to put a couple on every cord plugged 
into the UPS as well, it would have helped.  I just got a Tripp Lite UPS 
of the same size and had no further trouble.

Van, W1WCG

On 8/18/2011 2:42 PM, Don Wilhelm wrote:
> 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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