[Elecraft] Fwd: Wall wart for KX3

[W2bpi1 at aol.com]

I forgot to mention the one that MFJ sells. Have used it on mni radios.  
Clean stable output.  72 George/W2BPI
 
 
  
____________________________________
 From: mzilmer at magellangps.com
To: W2bpi1 at aol.com,  Elecraft at mailman.qth.net
Sent: 12/19/2012 11:31:05 A.M. Eastern Standard  Time
Subj: RE: [Elecraft] Wall wart for KX3


George has an excellent point (killing good radios), but be  advised that 
the KX3 is designed to work from pure DC power (batteries) and  doesn't 
tolerate power supply ripple and transients well.  So filtering  of the DC is 
necessary as well as good regulation.  Most wall warts out  of the box have 
neither.  This comes true in spades, in a mobile  installation (see  
http://www.elecraft.com/manual/Rev-B1-1.6-KX3-Mobile-Owners.pdf for more on  mobile 
installations and ops).  

My "on the road" AC supply is a  MeanWell switcher.  It's got a few broad 
HF spurs.  I treated these  as conducted emissions and used a Laird LFB174095 
ferrite core w/ 5 turns  through it to suppress them.  There are still a 
few spurs being radiated,  and even though they're broad they are also below 
the atmospheric noise  level.  KX #6 only hears them with the antenna cable  
disconnected.

Matt Zilmer
Consultant - Product Management  Dept.
Magellan Navigation / MiTAC Digital Corp.
Tel: (909)  394-6052
Cell: (909) 730-6552
In status quo voluntas non  sufficit


-----Original Message-----
From:  elecraft-bounces at mailman.qth.net 
[mailto:elecraft-bounces at mailman.qth.net] On  Behalf Of W2bpi1 at aol.com
Sent: Wednesday, December 19, 2012 8:12 AM
To:  Elecraft at mailman.qth.net
Subject: [Elecraft] Wall wart for KX3

I  bought several 18VDC ones and pried them open. There was enough room   
inside to add a regulator and extra filter cap. Used with other QRP rigs  
but  
never with a KX3. Yes mni wallwarts will kill a good  radio!  72   
George/W2BPI
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