[Elecraft] K2 power jack

Sun Feb 23 13:54:02 2003

This is a stupid question I know, but how does one connect banana plugs?
I have never used them and don't have a very good idea as to how to
secure wires to them.  There are several in the kit and I have been
wondering about them.  I guess now is a good time to ask the question.

Bruce - W8FU

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of David A. Belsley
Sent: Sunday, February 23, 2003 1:31 PM
To: Indy; [email protected]
Subject: Re: [Elecraft] K2 power jack

Fred:
  Your problem, as you are no doubt aware, is almost certainly due to a 
power cord or power feeder system with too high resistance.  Recall that
3 
amps (a reasonable K2 current draw under tx) will drop 1.5 volts through

only 1/2 ohms.  To minimize this, you should use as large guage power
cord 
as possible: at least 14 guage, and preferably 12.  The K2 plug itself
is 
not a problem; the problem is connecting large gauge wire to it.  The 
solution is simply to use very short pig-tails, say 18 guage, only 1"
long 
to connect between the plug and your heavier wire.  Shrink wrap will
help 
to add some structural strength to the join between the siffer, thick
wire 
and the thinner.  If you need junction boxes, build them with banana 
jacks/plugs to accommodate the larger guage wire or use Anderson plugs, 
like those used with the KPA100.

best wishes,

dave belsley, w1euy

--On Sunday, February 23, 2003 10:37 AM -0700 Indy <[email protected]>
wrote:

> Battery to K2, key down, I find significant voltage drop, sometimes as
> much as 1.5 volts after going through a junction box.  Note there is
> essentially no voltage drop until current is being drawn.  At least
part
> of the problem I think is the K2 power jack.  It is very difficult to
> make a power cable with HEAVY wire that will go on the tiny plug for
that
> jack.
>
> Has anyone worked with this problem?  Found a plug that will take
heavy
> battery wire or perhaps replaced or paralleled the jack???
>
> 72.
>
> Fred
> kt5x
> K2 # 700
>
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----------------------------------
David A. Belsley
Professor of Economics
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