[Elecraft] Power Werx S5-30DV Switching P/S "Heads Up"

[W0UCE]

I recently acquired two Power Werx S5-30DV Switching Power Supplies. 

 

While the P/S are nice and small, work on 110 / 220 and easily powered my
K-3 and TS-480,  BEWARE...  The P/S come from the factory set for 220V
(Slide Switch Selection on the back)  The documentation sheet with the P/S
doesn't mention the factory default setting of 220.  

 

If you power a K-3 or most likely any other rig without changing the input
voltage setting to 110 if you run the P/S on 110 and don't change the input
voltage switch to 110,  you will have terrible AC on transmit when the RF
level of the radio is increased over 10 Watts.  

 

73,

Jack W0UCE