[Elecraft] Wall wart for KX3

[Jim Sheldon]

I have one from MPJA that puts out 12.0 volts @ 4 amps which, as it turns out, is not enough voltage to charge batteries in the KX3 using the internal charger so seeing this one I checked on it further and found a link to the manufacturer's spec sheet.  It looks pretty good.  The supply has over voltage and overcurrent protection, 4.1 amps @ 14 volts and the spec lists it 14.0-14.9 volts so still within the KX3's safe range, especially if it puts out 14.0 like Chuck's does.  

Certainly cheap enough as well, $8.59 with free shipping.  (The MPJA supply was $12.95 plus shipping.) I did order one from eBay and I'll report back to the list after I get it and run some power/RFI tests on it.  From the Mfr. spec sheet, it has very low RF emissions and the output lead is Ferrite choked so hopefully it will be either extremely quiet or any RFI will be out of the ham bands.  Both of them are made in China (what isn't these days except for our favorite Elecraft gear?) however, the quality is very good on the MPJA box and from the pictures, the one from eBay is as well.  

On the MPJA supply, it was originally intended for a respirator used to treat "Sleep Apnea" so it is medical grade and extremely quiet RF wise.  I didn't find any noticeable birdies in any of the ham bands from it and planned to test it further when I saw this post. Hopefully this one on the auction site is just as quiet.  It is certainly a little cheaper than the one from MPJA and it will have enough voltage to operate the KX3 to it's full output as well as charge batteries.  The MPJA one will give 12 watts out, but it's just a bit wimpy in the voltage department for charging batteries.

Neither of these are really "Wall Warts" in the true sense of the words but certainly small and light enough to be considered extremely portable.

Jim - W0EB


> I use this one...14 volts, 4 amps. The plug on it fits the KX3 and
> the open ckt voltage is 14 vdc exactly.
>
> http://www.ebay.com/itm/KSAS065-65W-Adapter-power-supply-Output-
> 14Vdc-4A-2-1mm-plug-NEW-FREE-SHIP-
> /261135859531?pt=US_Monitor_Power_Supplies&hash=item3ccce8ff4b
>
> Chuck, KE9UW
> Lionel Trains, TCA, LCCA, LRRC
> aka Jack, BMW Motorcycles BMWMOA #224
>