[Elecraft] K2 Q7 unstable resistance

[Ron D'Eau Claire]

Mike asked:

The build for K2 #4661 continues...

I am doing the final resistance check on p. 71 of the K2 manual (the RF 
board is basically complete now), and I am getting unstable readings on 
the Q7 collector. The readings are all above 500 ohms, as they should 
be, but they are constantly changing. Hopefully this is normal?
----------------------

Hi, Mike!

Is the resistance steadily increasing as you hold the probe on the
collector? (Just a guess). 

There's a big 47 ufd capacitor in the collector circuit that must charge up
(C126). It'll take a while, depending upon how much current your DMM
provides in Ohms range. Modern DMM's really restrict the current to protect
transistors and diodes from damage, so the capacitor may take quite a while
to charge up and let the apparent resistance reading stabilize. 

Ron AC7AC