[Elecraft] K3 3051 audio buzz in chassis on SSB

[paulb]

Hi again folks

Follow up from original post;
I have run K3 on a dummy load on the bench.
Removed top cover, and transmit 100W SSB from the audio digi-memory M1.
The voice buzz is from the PA module, which I suppose is no big deal.
Removed the PA and checked all screws were tight, and put back into service.
No change to the audio buzz, it is my guess the PA final ferrite transformer
magnetic 
field is pretty strong, vibrating the core.

Interested to hear any follow up.

thanks

cheers from down under
Paul b
zl1ajy


I have the same buzz, and no question it is not the case.  I find it
particularly irritating when I have the built in voice keyer running and am
in a quiet shack.  I can almost make out my voice from the sound....

My GUESS as I have not yet held it down while transmitting (my rig is at
Elecraft for unrelated repair work), is that the heatsink for the internal
amp is making the noise....at least the noise is coming from that area. 
Although I have to agree that everything in my rig also seems very secure to
the touch.

73,
Tom-N2YTF



Can you damp it by putting your hand on any of the chassis panels?

~Brett

On Sat, 2009-07-04 at 04:55 -0700, paulb wrote:
> Hi folks
> 
> K3 going perfectly fine here.
> Just curious about an odd audio buzz
> in the rear of the chassis under heavy
> SSB modulation. It sounds like
> transformer or frame slightly loose,
> nothin
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