[Elecraft] K2 voltage drop across D10 and F1

[Trevor Day]

In message <475537F51AB2D211959D0001FA7EAAED0C6C2361@synt1.inland.com>, 
"Masleid, Michael A." <Michael.Masleid@ispat.com> writes
>Hello Ed,
>
>>Can someone tell me how much voltage drop they see between receive and
>>transmit while displaying current and voltage.  I am seeing about a 0.9 volt
>>drop when Key down and the K2 drawing about 2.5 Amps.
>
>Digikey shows the minimum cold resistance of an RGE300 at 0.034 ohms.
>That's only about 0.085 volts drop at 2.5 amps.  Of course, the resistance
>goes up a bit with temperature.

A stupid question perhaps, but have you checked the voltage directly 
across the supply in the same circumstances?  It is *possible* your 
supply has a fault (dry joint etc)
Trev G3ZYY
-- 
Trevor Day