Pleased...P3 No. 1327...

[Craig Smith]

An external relay (or FET) switch box controlled by the K3 is certainly the
way to go, and is the simplest project imaginable.  The builder can
configure it for their choice of DC connectors.  I built one here several
months ago when I first got my P3.  In addition to providing as much current
for accessories as you desire, a single switch on the box also allows for
manual ON or OFF of the accessories in addition to automatic control via the
K3.  In my case, the switched DC power goes to a strip of PowerPole outlets.


73   Craig  AC0DS



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[Lu Romero - W4LT]

Or you can do it by scrounging.  :)

At work, we had 4 Furman MP-15 remote switched power relay
outlets.  We obsoleted them when we did a redesign of our
attraction, so, as usual, I had an application for them in
mind, and rescued them from the dumpster in fine Ham
fashion.

These are 15 amp remote switched dual outlet power boxes
used to sequence high power audio amplifiers to protect the
mains from inrush trips.  Its a simple matter to take the
output of my 12v power supply and route it to the power
sensor on the MP-15.  When the main power supply is switched
on, the 12v activates the power to both the outlets via a
relay.  

for accessory power, like my MicroKeyers, speakers and the
like, I found a very small 15 amp switching 12v supply (at
CompUSA - Labeled ULTRA PS-15 - $19.95) in a rather "sexy"
back plastic case with foot stands.  It has 8 12v outlets
using barrel sockets.  It comes with 8 variable length
barrel to barrel cables, too.  It is amazingly quiet from
switching noise, I cant find any RF from it.  This little
item is plugged into the MP-15 and replaces all the wall
warts in my station.  When I power my main 12v Astron PS, it
triggers the MP-15, which turns everything in the shack on
except the linear and the K3 at once.

The only negative are the incredibly bright purple LED's on
each of the Ultra's active 12v outlets... A short length of
elecrtrical tape fixes that...

The MP-15 is quite expensive new, but they can be found on
Ebay.  But now I have three spares, just waiting for future
applications :)  I can add another one on the second outlet
to automatically turn on my amplifier... Maybe someday when
I get a round to-it... :)

-lu-

----------------------

Message: 8
Date: Tue, 03 May 2011 21:54:26 -0700
From: Alan Bloom <[hidden email]>
Subject: Re: [Elecraft] Pleased...P3 No. 1327...
To: [hidden email]
Cc: [hidden email]
Message-ID: <1304484866.1445.26.camel@ulinux-desktop>
Content-Type: text/plain; charset="UTF-8"

I'm surprised that RIGrunner or MFJ or somebody doesn't make
a 12V
distribution system with a remote on/off control that could
be connected
to the K3 switched 12V output.  Sounds like an opportunity:
Someone on
the list should market one.  Or at least design one and
write a QST
article.

Al N1AL



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