Re: K3 - Power cable voltage drop

Posted by Bob McGraw - K4TAX on Dec 22, 2019; 7:34pm
URL: http://elecraft.85.s1.nabble.com/K3-Power-cable-voltage-drop-tp7657290p7657302.html

I still connect all of the equipment which used walwarts to my power
supply.  I made provisions to have many many DC connections, as
described below,  to my supplies.  All of my DC power leads have the
correct size crimp ring terminal for the application. Never use stranded
wire around a screw.     Thus many problems solved.  I know the DC
distribution strips look cool with their LEDs and fuses and connectors,
and are very easy to use for convenience.  But I find just like AC
strips, are a source of many problems.   I've found many of the AC
strips which have a poor 3rd wire connection.   They are a matter of
convenience and not of reliable functionality.


> As to the Astron SS-30M, I have 3 of those.  They are great. I did find the provided DC connections where the wires are inserted into the blocks and secured with a screw from the side would not accommodate the 4 needs for DC at my station.    Therefore, I took two pieces of  2" x 10-32 brass machine screw, cut off the head, filed a small flat spot on one side at the end to make it slightly D shaped.   Inserted that end into the DC connector and tightened the set screw against the flat spot. Then added as needed the brass nuts, flat washers and lock washers, secured finally by another brass nut.   This in effect gives me very adequate terminal length to attach as many DC power leads with suitable ring terminals as needed.  DC resistance has therefore been minimized.     The 10 ga wire is a good addition for radio power needs.
>
> I also added a dedicated ground between the ground screw on the back of the radio to the ground screw on the power supply.


73

Bob, K4TAX


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