[Elecraft] Possible K3 over shoot on transmit

[Bob McGraw K4TAX]

Since the K3/K3S has the ability to indicate voltage on the display, from actual experience,  between RX and TX there should be less than 0.5 volts difference in CW mode, key closed at 100 watts output.  Anything greater indicates poor power supply regulation, or more likely, excessive resistance in the DC power cables or related connections.   

NEVER use a power distribution strip but always connect the radio directly to the power supply terminals.   And without added in- line fuses unless a battery is used for the DC source as a battery does not contain current limiting as found with a power supply.  

Bob, K4TAX


Sent from my iPhone

> On Jan 12, 2020, at 6:01 PM, Brian Hunt <huntinhmb at coastside.net> wrote:
> 
> I saw this problem with my K3 #4xxx and discovered a large voltage drop between the PS and K3 using the provided power cable. Cured the problem by:  1) shorter & fatter power cable, 2) increased the PS (Astron 30A linear) to 14.5v, and 3) running the K3 utility power calibration _twice_ back-to-back. Why it took 2x I don't know but it's been 100% fine ever since. 
> 
> 73,
> Brian, K0DTJ
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