[Elecraft] Samlex 1223 and K1 RIT mod applicability

[Steve Jackson]

Two items in this message:

#1 Someone wrote:
"I use a Samlex SEC 1223 regulated DC power supply which has an output vol=
tage of 13.8 VDC and an output current of 23 Amps continuous/25 Amps maxi=
mum."

Gee, so do I!

I turned the '1223 up to 14.1 volts using its internal pot.  (There are two
pots, the other is the current limit <or is it the crowbar?> and I forget
which is which now, sorry).

The SEC1223 is RF silent, AND easily runs the IC756/K2 station AND floats
the K2 internal battery AND also the big SLA that is in the garage right
under the shack (hooked up with 1/0 wire).  If the AC goes away, the '1223
does not care that there's DC on its power pins.   Interesting that the
SEC1223 is frequently also the least expensive 20A supply around,
availability is good, and support is excellent.  I even tried a remote sense
mod once, with full support from the design engineer himself, who (if memory
serves) was in Vancouver BC - and I got him on the phone with a single call.
(The mod didn't work.)

My PS is mounted out of sight  ... I did it by taking the lid off and
drilling 4 holes into it, and then mounting the lid to the bottom of my
shack table with short self-tapping screws.  I then just re-mounted the
supply chassis.  Zero desktop footprint!  I turned it on, and forgot it.  3
years that way so far, almost, and no problems.

#2  There is a VERY clever mod for the K1 RIT control in circulation.  But I
don't have a K1.

I was going to download the K1 schematic, if it's on the website, and
compare it to the K2 RIT circuit to see if the mod will work there as well
... or if I'll have to take the same concept and re-engineer it.

Then it dawns on me, I should ask and see if someone else has already done
all this!
So: will the K1 RIT mod work on the K2?

tia de Steve KZ1X/4  K2 #771