[Elecraft] K3 - bad CW note

[Rick N6CY]

I recently completed building my K3 and listening on a different transceiver
in the shack, I also noticed a light hum/buzz superimposed on my 18-24 MHz
CW signal at levels above 12, up to 100 watts, into a dummy load. Also using
a switching power supply, Astron SS-30. I don't own a linear power supply to
substitute. However when I switch to battery-only, the buzz is still
present. So over time I'll try to verify with stations if this is just a
"local", in-station phenomenon, or truly going out on the air. Propagation
hasn't actually been good for these upper frequencies...

73 Rick N6CY



John W2XS wrote:
> 
> Is there a difference in the power supplies at the two stations?  I had a
> very similar bad CW report when I first got my K3 which was due to a
> switching power supply that I was using.  The note was bad at all power
> levels on several bands.  I bought an Astron RS-35A and the reports were
> good.  I still wonder why the switcher didn't work well since it was a
> 12V, 24A supply.  
> 
> Good luck.  John W2XS
> 

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