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KX3 Power Supply

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N4KDJ

KX3 Power Supply

I purchased 5V, 12V, & 15V versions of the Solas power supplies made in
Germany. The SCP30S15DN 15V @ 2A 2 A Amp 100-240V 0.75A are currently
selling on ebay for about $25. I have not done any extensive testing but
have not noticed any power irregularities or hash. They seem to be very
well made units made for an industrial setting.

Keith, N4KDJ

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Jeffrey Otterson

Re: 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 <[hidden email]>
> To:
> Cc: Elecraft Reflector <[hidden email]>
> 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

Alan Sewell N5NA

Re: KX3 power supply

In reply to this post by N4KDJ

I found my PAE-Kx33 also put out hash I could hear when operating near
my mag loop. I put two mix 33 split ferrite cores with 5 turns each on
the DC cable near the power supply. That knocked the hash down so it's
negligible.

73, Alan N5NA

On 1/19/2016 6:10 AM, [hidden email] wrote:

> Message: 18
> Date: Mon, 18 Jan 2016 19:38:50 -0600
> From: Chip Stratton<[hidden email]>
> Cc: Elecraft Reflector<[hidden email]>
> Subject: Re: [Elecraft] KX3 power supply
> Message-ID:
> <[hidden email]>
> Content-Type: text/plain; charset=UTF-8
>
> 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

Jim Bolit

Re: KX3 power supply

In reply to this post by Jeffrey Otterson

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:[hidden email]] On Behalf Of
Jeffrey Otterson
Sent: Tuesday, January 19, 2016 6:39 AM
To: [hidden email]
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 <[hidden email]>
> To:
> Cc: Elecraft Reflector <[hidden email]>
> 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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______________________________________________________________
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