[Elecraft] Voltage drop in DX Power to K3

[N4ZR]

Gee Jim, I didn't think I was *that* stupid. Yes, I didn't get the 
decimal places right -that was a simple brain phart.  As for the 
licensing tests, did you have to draw a Colpitts oscillator?  IIRC, that 
was on my General exam in 1955.

With the power strip, what's wrong with measuring the voltage in and 
out, knowing the current being drawn, and deriving the resistance from 
that?

73, Pete N4ZR
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On 4/26/2020 6:24 PM, Jim Brown wrote:
> I wouldn't expect useful accuracy from anything but a lab instrument 
> for such low resistances as a few feet of #12. Far better to look up 
> the resistance of copper wire from a wire table. An unknown "black 
> box" like a power strip is not so easy. :) As for the protection 
> diode, that's pretty easy too -- look up the junction voltage for that 
> type of diode, and you're within 0.1 volt of reality.
>
> The thing I find baffling (or depressing) here is that we all had to 
> understand Ohm's Law to pass the exam for our license, and it's REAL 
> simple.  Take resistance values from a wire table, multiply by the 
> length, then by two for the two conductors, then by the current. I 
> dunno what the exam is like nowadays -- my experience was 1955 with 
> the Novice test and a year later with the General -- but surely there 
> must be something about how diodes work!
>
> 73, Jim K9YC
>
>
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