K2 on order!

[Jim AB3CV]

Santa is loading up his sleigh with a K2!

Any recommendations on a 5A power supply that won't dwarf this and behave
electrically?

I've got a 20A Astron that powers my current rig that I'd like to move to
the lab.

73

jim ab3cv

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[Ken Kopp-2]

If you're happy with your Astron, why not buy one
of the smaller ... say 7A or 10A ... Astrons?  They
also make some nice low-profile cabinet units.

73! Ken Kopp - K0PP
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[Ron D'Eau Claire-2]

In addition to the smaller Astrons, Ten Tec makes a small 11-amp supply: the
model 937. It's about the same "footprint" as the K2 but about half as high
as a K2. Remember, you're looking at ICAS or "intermittent" duty ratings,
not continuous duty, unless you are planning to put a 15 watt unkeyed
carrier on the air and leave it there permanently (or until FCC and your
fellow Hams storm your front door).

WARNING, WARNING, WARNING Will Robinson! (Remember "Lost in Space" or have I
dated myself yet again?)

Do NOT put your K2 on top of or next to a power supply, especially a
"linear" power supply. The magnetic field around the power transformer will
invoke various gremlins in the K2. The K2 has been "hardened" against most
of these gremlins, but it's not absolutely problem-proof. The magnetic field
from the power transformer flopping about at 60 Hz gets into the toroids and
can cause various things from frequency warble on the signal to hum on the
carrier.

Recommend keeping a small supply at least 6 to 12 inches away from your K2.
After discovering that my supply went on a stool under the operating desk,
freeing up space on the desk and keeping it a couple of feet from the rig.

Ron AC7AC


-----Original Message-----
Santa is loading up his sleigh with a K2!

Any recommendations on a 5A power supply that won't dwarf this and behave
electrically?

I've got a 20A Astron that powers my current rig that I'd like to move to
the lab.

73

jim ab3cv

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[Craig Smith]

Hi Jim ...

Congratulations on the K2 order - you will love it.

<> Any recommendations on a 5A power supply that won't dwarf this and behave
<> electrically?

I'm using a Gamma.  It is a VERY small power supply - only 3.5" by 1.5" by
5" and weighs a little over a pound.  It seems to be a high quality unit
with an innovative design - A low powered supply supplemented by an internal
Super Cap for peak loads.  As far as I can tell, it is absolutely quiet EMI
wise.  Mine is 6 inches away from my K2 and no electrical noise.  It is
actually overkill for a base K2, but in spite of its diminutive size will
actually power a 100W SSB rig or about 80 W CW in their normal duty cycles.
Should be a very flexible unit for travel, etc., especially if you ever
upgrade to the 100W amp.  Have had mine for 5 months now and really like it.
Have had lots of round the clock use from it during Sweepstakes, CQ WW DX
contest, etc.  Check it out at:  www.gammaresearch.net and also see the EHam
reviews.  I have no connection with the company.

Enjoy the build process  ;>)

                73
                         ... Craig


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[ni0c]

Jim,
Congrats on taking on the K2!  I'm just a couple of weeks ahead of you, feverishly working on s/n 5853, the low power version.

Regarding the power supply-- I'm starting out with a Pyramid PS-4KX  (13.8 V. 3A continous, 4A surge) that I have on hand.  Since I also purchased the KBT2 internal battery option, I may look for a small Astron supply with an adjustable voltage.  I understand the internal battery requires at least 14V at the K2 power plug input for proper charging.

73 & happy building!

Chuck  NI0C
 
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[Don Wilhelm-3]

Chuck and all,

With the internal battery, there is an alternative to powering the K2 with a
14.1 volt supply - make provisions to attach a 3 state charger directly to
the battery terminals.  To see how that can be accomplished safely, check
out my website http://w3fpr.qrpradio.com

73,
Don W3FPR

> -----Original Message-----
>
> Regarding the power supply-- I'm starting out with a Pyramid
> PS-4KX  (13.8 V. 3A continous, 4A surge) that I have on hand.
> Since I also purchased the KBT2 internal battery option, I may
> look for a small Astron supply with an adjustable voltage.  I
> understand the internal battery requires at least 14V at the K2
> power plug input for proper charging.
>
> 73 & happy building!
>
> Chuck  NI0C
>

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