[Elecraft] K3/100 input voltage and TX IMD

[David Cutter]

Have you measured the transient response time?  Should be easy to see a 1V 
transient with a modest scope.

David
G3UNA




>> "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
>
>