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[Bill Miller]

What is recommended for a K-3 power supply? (New owner)

Bill K9HXO
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[Ian Kahn, KM4IK]

Bill,

I use an Astron SS-30, and it works great.  I've used this power supply
since I got licensed five years ago, and this is the third HR rig it
powered without any issues, even though it is a switching power supply.

Hope this helps.

73,

--Ian
 Ian Kahn, KM4IK
Roswell, GA  EM74ua
[hidden email]
K3 #281, P3 #688

On Sun, Mar 25, 2012 at 1:46 PM, Bill Miller <[hidden email]> wrote:

> What is recommended for a K-3 power supply? (New owner)
>
> Bill K9HXO
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--
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[Jim Brown-10]

On 3/25/2012 10:46 AM, Bill Miller wrote:
> What is recommended for a K-3 power supply? (New owner)

Any decent supply that regulates to about 13VDC will work well provided
that it is not electrically noisy.  I've used Astron linear supplies,
and a compact PowerWerx unit rated for 20A. The latter is  switcher, but
I haven't found any electrical noise.

For many years,  all of the 12V rigs I've owned, and all of the 12V
accessories on my operating desk, have been powered by a big Costco deep
cycle battery that is float-charged by an el-cheapo regulated 10A
switching supply that I bought for $10 at a hamfest about ten years ago.
That switcher was REAL noisy, but I was able to tame it with a few
capacitors and chokes on both AC and DC wiring.  10A is plenty to keep
up with even the most serious contesting.

73, Jim K9YC
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[vk4tux]

A solid 15v (adjustable to 15v) supply is best, capable of 30 amp with good
regulation.
Good quality switch mode recommended.

 A cable upgrade into the K3 is recommended too.
The original K3 factory cable has too much volt drop, my replacement is 4 x
the size of original csa.

15v in with cable upgrade to provide ~0.4v volt drop provides;

Significant TX IM3 performance

Elimination of high current warmings and bucks especially on 6m

Instant full power as set on turn on & first TX, no "K3 power creep up to
full level after a while" issue.

No problem to run a P3 with svga adaptor direct from K3 as is without the
0.6 amp resettable fuse tripping.
No mods required, and P3 turns on with the K3.

Mine runs at 15.2v no-load and 14.8v loaded, and has never performed better.

Adrian ... vk4tux

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Jim Brown
Sent: Tuesday, 27 March 2012 3:19 AM
To: [hidden email]
Subject: [Elecraft] K3 Power Supply

On 3/25/2012 10:46 AM, Bill Miller wrote:
> What is recommended for a K-3 power supply? (New owner)

Any decent supply that regulates to about 13VDC will work well provided that
it is not electrically noisy.  I've used Astron linear supplies, and a
compact PowerWerx unit rated for 20A. The latter is  switcher, but I haven't
found any electrical noise.

For many years,  all of the 12V rigs I've owned, and all of the 12V
accessories on my operating desk, have been powered by a big Costco deep
cycle battery that is float-charged by an el-cheapo regulated 10A switching
supply that I bought for $10 at a hamfest about ten years ago.
That switcher was REAL noisy, but I was able to tame it with a few
capacitors and chokes on both AC and DC wiring.  10A is plenty to keep up
with even the most serious contesting.

73, Jim K9YC
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