[Elecraft] K3-Front panel shut down question.

[Jim McDonald]

I am using a Tripp-Lite G1000U and haven't noticed any noise.  It's
described at 
http://www.tripplite.com/en/products/Specialty-Products.cfm?MDLID=4164 
and http://www.stratagemtech.com/media/pro090304ups.htm .

As Guy says, when the AC power is being supplied the UPS just passes it,
though it does have automatic voltage regulation.

I got it at Costco for about $100, and they are now carrying a new model.
http://tinyurl.com/3utbrcd 

I have an Astron RS-35M for the K3, an Astron SS-12 (switching, though seems
to be quiet) for 2M and 450 radios, and a SteppIR controller plugged in it.

Jim N7US


-----Original Message-----

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.

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.


>> Ron AC7AC