[Elecraft] K3 Voltage on TX

[Don Wilhelm]

Rich,

Yes, that is abnormal.
Either your power supply is sagging or there is too much voltage drop in 
the power cable.
To figure out which it is, measure the power supply voltage at its 
terminals during transmit.  If it is staying "right up there" as it 
should, then the problem is in the cable.  Check that the power supply 
terminals are tight, check that the fuseholders have good contact with 
the fuses (change the fuse(s) because they can develop a higher than 
normal resistance.  Make certain that the APP connector on the K3 end of 
the cable has its contacts fully inserted - the tip of the connector 
blade should be latched over the spring finger below it.  If you can see 
both the spring finger and the tip of the contact blade when you look 
from the front, the contact blade is not fully inserted.

73,
Don W3FPR

On 10/26/2015 11:48 AM, Rich wrote:
> Folks,
>
> I am not sure if I have some sort of issues or not.  My K3 shows 
> 13.7VDC on RX. When I TX that reading drops to 10.9VDC.  Is that a 
> normal drop?  I do not believe this is a K3 issue, but I was wondering 
> if others see that much drop before I dig into my 12VDC supply system.
>
> Thanks
> Rich
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