[Elecraft] KX3 power supply

[Jim Bolit]

Arrow Electronics (disty) has the lowest price

The picture they have for the part number below is wrong.  The p/n is for
the big clamp 31 material




31 material big clamp on
 
·    FAIR-RITE 0431177081

http://components.arrow.com/part/detail/48300806S8316702N4455



Jim
W6AIM







-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
Jeffrey Otterson
Sent: Tuesday, January 19, 2016 6:39 AM
To: Elecraft at mailman.qth.net
Subject: Re: [Elecraft] KX3 power supply

Hello Chip,

I did a lot of testing of KX3 power supplies, and the PAE is the quietest,
next to a linear power supply.

I had a fair amount of EMI problems, too, until I put a big ferrite bead
(Fair-Rite 0431176451) on the DC output wire.  I wound 6 turns though the
core, right at the power plug that goes into the KX3.  This brought the
noise down to barely audible, totally tolerable.

I bought the cores from Verical.com -- they had the best deal on them -- but
they appear to be out of stock.  Mouser's got them for under $8.  These are
the same cores that K9YC recommends in his "RF Interference to Audio
Systems" paper.

73

Jeff n1kdo

---------- Forwarded message ----------
> From: Chip Stratton <lightdazzled at gmail.com>
> To:
> Cc: Elecraft Reflector <Elecraft at mailman.qth.net>
> Date: Mon, 18 Jan 2016 19:38:50 -0600
> Subject: Re: [Elecraft] KX3 power supply The PAE power supply works 
> fine, but it still puts out enough hash that I can't use my loop 
> antenna near it. It is better than others? Probably, but still not 
> usable for me when near  the receiving antenna.
> Chip
> AE5KA
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