[Elecraft] K3 after turning on doesn't receive or transmit

[Bob McGraw K4TAX]

I would also comment with Knut, AB2TC, that one must always turn the 
radio on and off with the power switch.  This allows the internal 
workings to store the data.   If you use a "master station switch" thus 
just dump the power supply then the radio may not store the data as 
required.   I recall the term "power down imminent" or PDI.

Years ago we had "the big switch" which was used to shut the station 
down.  Today with all of the computerized gadgets, power down in 
sequence is more and more of a must do.

In another brand of radio to which I am familiar, there is a CPU timing 
circuit that assures the CPU is up and running before loading the 
operating code.   If this circuit is running too fast, it may cause a 
partial load and related error.  This circuit is basically a simple RC 
network, and with age the C value decreases thus making the timing 
circuit run too fast.   i.e.  not enough delay.

73

Bob, K4TAX