[Elecraft] K3/100 input voltage and TX IMD

[Paul Christensen]

> "It would be interesting to check the voltage drop from the APP on the K3 
> to the cathode of D11 ( component of KPA3) when under a 100 watt load. 73 
> Gil   K8EAG"

Cascading APP connectors can add up to relevant IR loss.   For example, in 
my installation, the power supply and a 55-AH gel-cell battery (back-up) are 
routed to West Mountain PowerGate.  The PowerGate feeds an 8-port APP 
manifold.  One manifold port feeds the K3.  That's 5 (count 'em) APP 
connector sets in the power supply path.

At ~ 20A, the voltage drop at the K3 is nearly one volt when using #10 AWG 
wire -- and the reason why I am now using an industrial-grade power supply 
with remote sensing terminals that makes up for the IR loss on demand.  The 
other devices on the manifold can easily withstand the variation.

Paul, W9AC