I forgot to mention the one that MFJ sells. Have used it on mni radios.
Clean stable output. 72 George/W2BPI
____________________________________
From:
[hidden email]
To:
[hidden email],
[hidden email]
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:
[hidden email]
[mailto:
[hidden email]] On Behalf Of
[hidden email]
Sent: Wednesday, December 19, 2012 8:12 AM
To:
[hidden email]
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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