[Elecraft] KXPA100 SSB Distortion

[David Gilbert]

I also had some distorted audio reports on my transmitted SSB signal 
when I first got my K3.  I finally narrowed it down to the fact that I 
had it connected to my computer (RS-232 for sure and I might have been 
feeding the receive audio into the computer sound card as well).   I 
made a K3 chassis to computer chassis bonding strap using some RG-8 
braided shield.  I started out with the strap being about three feet 
long and kept shortening it until the distortion totally went away at 
about 12 inches long (verified using a second battery powered rig to 
listen to my own signal).

So the first thing I would do is make sure all of your gear adheres to 
proper bonding practice.

73,
Dave   AB7E



> Ray W2RS wrote:
>
> My KXPA100 transmits distorted audio on SSB, but works normally on CW and
> RTTY.  With 100 watts output, drain current is 11.7 A and supply voltage
> is 13.1 V, down from 13.7 V on receive.  My power supply is a pre-MFJ
> Astron RS-35A.
>
>
> The KX3 with which I drive it operates normally on all bands and modes,
> with good transmit audio.  Speech compression is off and mic gain is set
> to 20.
>
>
> Should I send the amp back to Elecraft for service, or is there another
> problem?
>
>
> 73 Ray W2RS